Merge pull request 'Complete Beast format implementation with enhanced features and fixes' (#19) from beast-format-refactor into main

Reviewed-on: #19

.gitignore

@@ -3,6 +3,10 @@ skyview
 build/
 dist/
 
+# Debian package build artifacts
+debian/usr/bin/skyview
+debian/usr/bin/beast-dump
+
 # Configuration
 config.json
 

CLAUDE.md

@@ -0,0 +1,39 @@
+# SkyView Project Guidelines
+
+## Documentation Requirements
+- We should always have an up to date document describing our architecture and features
+- Include links to any external resources we've used  
+- We should also always have an up to date README describing the project
+- Shell scripts should be validated with shellcheck
+- Always make sure the code is well documented with explanations for why and how a particular solution is selected
+
+## Development Principles
+- An overarching principle with all code is KISS, Keep It Simple Stupid
+- We do not want to create code that is more complicated than necessary
+- When changing code, always make sure to update any relevant tests
+- Use proper error handling - aviation applications need reliability
+
+## SkyView-Specific Guidelines
+
+### Architecture & Design
+- Multi-source ADS-B data fusion is the core feature - prioritize signal strength-based conflict resolution
+- Embedded resources (SQLite ICAO database, static assets) over external dependencies
+- Low-latency performance is critical - optimize for fast WebSocket updates
+- Support concurrent aircraft tracking (100+ aircraft should work smoothly)
+
+### Code Organization
+- Keep Go packages focused: beast parsing, modes decoding, merger, server, clients
+- Frontend should be modular: separate managers for aircraft, map, UI, websockets
+- Database operations should be fast (use indexes, avoid N+1 queries)
+
+### Performance Considerations
+- Beast binary parsing must handle high message rates (1000+ msg/sec per source)
+- WebSocket broadcasting should not block on slow clients
+- Memory usage should be bounded (configurable history limits)
+- CPU usage should remain low during normal operation
+
+### Documentation Maintenance
+- Always update docs/ARCHITECTURE.md when changing system design
+- README.md should stay current with features and usage
+- External resources (ICAO docs, ADS-B standards) should be linked in documentation
+- Country database updates should be straightforward (replace SQLite file)

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 SkyView Contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Makefile

@@ -1,12 +1,26 @@
-BINARY_NAME=skyview
+PACKAGE_NAME=skyview
 BUILD_DIR=build
+VERSION=$(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
+LDFLAGS=-w -s -X main.version=$(VERSION)
 
-.PHONY: build clean run dev test lint
+.PHONY: build build-all clean run dev test lint deb deb-clean install-deps
 
+# Build main skyview binary
 build:
-	@echo "Building $(BINARY_NAME)..."
+	@echo "Building skyview..."
 	@mkdir -p $(BUILD_DIR)
-	go build -ldflags="-w -s" -o $(BUILD_DIR)/$(BINARY_NAME) .
+	go build -ldflags="$(LDFLAGS)" -o $(BUILD_DIR)/skyview ./cmd/skyview
+
+# Build beast-dump utility binary
+build-beast-dump:
+	@echo "Building beast-dump..."
+	@mkdir -p $(BUILD_DIR)
+	go build -ldflags="$(LDFLAGS)" -o $(BUILD_DIR)/beast-dump ./cmd/beast-dump
+
+# Build all binaries
+build-all: build build-beast-dump
+	@echo "Built all binaries successfully:"
+	@ls -la $(BUILD_DIR)/
 
 clean:
 	@echo "Cleaning..."
@@ -19,7 +33,7 @@ run: build
 
 dev:
 	@echo "Running in development mode..."
-	go run main.go
+	go run ./cmd/skyview
 
 test:
 	@echo "Running tests..."
@@ -33,6 +47,33 @@ lint:
 		echo "golangci-lint not installed, skipping lint"; \
 	fi
 
+# Debian package targets
+deb:
+	@echo "Building Debian package..."
+	@./scripts/build-deb.sh
+
+deb-clean:
+	@echo "Cleaning Debian package artifacts..."
+	@rm -f debian/usr/bin/skyview
+	@rm -rf build/*.deb
+
+deb-install: deb
+	@echo "Installing Debian package..."
+	@if [ "$$EUID" -ne 0 ]; then \
+		echo "Please run as root: sudo make deb-install"; \
+		exit 1; \
+	fi
+	@dpkg -i build/skyview_*.deb || (apt-get update && apt-get -f install -y)
+
+deb-remove:
+	@echo "Removing Debian package..."
+	@if [ "$$EUID" -ne 0 ]; then \
+		echo "Please run as root: sudo make deb-remove"; \
+		exit 1; \
+	fi
+	@dpkg -r skyview || true
+
+# Docker/Podman targets
 docker-build:
 	@echo "Building Docker image..."
 	docker build -t skyview .
@@ -41,8 +82,21 @@ podman-build:
 	@echo "Building Podman image..."
 	podman build -t skyview .
 
+# Development targets
 install-deps:
 	@echo "Installing Go dependencies..."
 	go mod tidy
 
+format:
+	@echo "Formatting code..."
+	go fmt ./...
+
+vet:
+	@echo "Running go vet..."
+	go vet ./...
+
+# Combined quality check
+check: format vet lint test
+	@echo "All checks passed!"
+
 .DEFAULT_GOAL := build

README.md

@@ -1,112 +1,268 @@
-# SkyView - ADS-B Aircraft Tracker
+# SkyView - Multi-Source ADS-B Aircraft Tracker
 
-A modern web frontend for dump1090 ADS-B data with real-time aircraft tracking, statistics, and mobile-responsive design.
+A high-performance, multi-source ADS-B aircraft tracking application that connects to multiple dump1090 Beast format TCP streams and provides a modern web interface with advanced visualization capabilities.
 
-## Features
+## ✨ Features
 
-- **Real-time Aircraft Tracking**: Live map with aircraft positions and flight paths
+### Multi-Source Data Fusion
-- **Interactive Map**: Leaflet-based map with aircraft markers and optional trails
+- **Beast Binary Format**: Native support for dump1090 Beast format (port 30005)
-- **Aircraft Table**: Sortable and filterable table view with detailed aircraft information
+- **Multiple Receivers**: Connect to unlimited dump1090 sources simultaneously
-- **Statistics Dashboard**: Real-time statistics and charts for signal strength, aircraft counts
+- **Intelligent Merging**: Smart data fusion with signal strength-based source selection
-- **WebSocket Updates**: Real-time data updates without polling
+- **High-throughput Processing**: High-performance concurrent message processing
+
+### Advanced Web Interface
+- **Interactive Maps**: Leaflet.js-based mapping with aircraft tracking
+- **Low-latency Updates**: WebSocket-powered live data streaming
 - **Mobile Responsive**: Optimized for desktop, tablet, and mobile devices
-- **Single Binary**: Embedded static files for easy deployment
+- **Multi-view Dashboard**: Map, Table, Statistics, Coverage, and 3D Radar views
 
-## Configuration
+### Professional Visualization
+- **Signal Analysis**: Signal strength visualization and coverage analysis
+- **Range Circles**: Configurable range rings for each receiver
+- **Flight Trails**: Historical aircraft movement tracking  
+- **3D Radar View**: Three.js-powered 3D visualization 
+- **Statistics Dashboard**: Aircraft count timeline *(additional charts under construction)* 🚧
+- **Smart Origin**: Auto-calculated map center based on receiver locations
+- **Map Controls**: Center on aircraft, reset to origin, toggle overlays
+- **Signal Heatmaps**: Coverage heatmap visualization *(under construction)* 🚧
 
-### Environment Variables
+### Aircraft Data
+- **Complete Mode S Decoding**: Position, velocity, altitude, heading
+- **Aircraft Identification**: Callsign, category, country, registration
+- **ICAO Country Database**: Comprehensive embedded database with 70+ allocations covering 40+ countries
+- **Multi-source Tracking**: Signal strength from each receiver
+- **Historical Data**: Position history and trail visualization
 
-- `SKYVIEW_ADDRESS`: Server listen address (default: ":8080")
+## 🚀 Quick Start
-- `SKYVIEW_PORT`: Server port (default: 8080)  
-- `DUMP1090_HOST`: dump1090 host address (default: "localhost")
-- `DUMP1090_DATA_PORT`: dump1090 SBS-1 data port (default: 30003)
-- `ORIGIN_LATITUDE`: Receiver latitude for distance calculations (default: 37.7749)
-- `ORIGIN_LONGITUDE`: Receiver longitude for distance calculations (default: -122.4194)
-- `ORIGIN_NAME`: Name/description of receiver location (default: "Default Location")
-- `SKYVIEW_CONFIG`: Path to JSON configuration file
 
-### Configuration File
+### Using Command Line
 
-SkyView automatically loads `config.json` from the current directory, or you can specify a path with `SKYVIEW_CONFIG`.
+```bash
+# Single source
+./skyview -sources "primary:Local:localhost:30005:51.47:-0.46"
 
-Create a `config.json` file (see `config.json.example`):
+# Multiple sources  
+./skyview -sources "site1:North:192.168.1.100:30005:51.50:-0.46,site2:South:192.168.1.101:30005:51.44:-0.46"
+
+# Using configuration file
+./skyview -config config.json
+```
+
+### Using Debian Package
+
+```bash
+# Install
+sudo dpkg -i skyview_0.0.2_amd64.deb
+
+# Configure 
+sudo nano /etc/skyview/config.json
+
+# Start service
+sudo systemctl start skyview
+sudo systemctl enable skyview
+```
+
+## ⚙️ Configuration
+
+### Configuration File Structure
 
 ```json
 {
   "server": {
-    "address": ":8080", 
+    "host": "",
     "port": 8080
   },
-  "dump1090": {
+  "sources": [
-    "host": "192.168.1.100", 
+    {
-    "data_port": 30003
+      "id": "primary",
+      "name": "Primary Receiver",
+      "host": "localhost",
+      "port": 30005,
+      "latitude": 51.4700,
+      "longitude": -0.4600,
+      "altitude": 50.0,
+      "enabled": true
+    }
+  ],
+  "settings": {
+    "history_limit": 1000,
+    "stale_timeout": 60,
+    "update_rate": 1
+  },
+  "origin": {
+    "latitude": 51.4700,
+    "longitude": -0.4600,
+    "name": "Custom Origin"
   }
 }
 ```
 
-### Data Source
+### Command Line Options
-
-SkyView uses **SBS-1/BaseStation format** (Port 30003) which provides decoded aircraft information including:
-- Aircraft position (latitude/longitude)
-- Altitude, ground speed, vertical rate
-- Flight number/callsign
-- Squawk code and emergency status
-
-## Building and Running
-
-### Build
 
 ```bash
-go build -o skyview .
+skyview [options]
+
+Options:
+  -config string
+        Configuration file path
+  -server string
+        Server address (default ":8080")  
+  -sources string
+        Comma-separated Beast sources (id:name:host:port:lat:lon)
+  -verbose
+        Enable verbose logging
 ```
 
-### Run
+## 🗺️ Web Interface
+
+Access the web interface at `http://localhost:8080`
+
+### Views Available:
+- **Map View**: Interactive aircraft tracking with receiver locations
+- **Table View**: Sortable aircraft data with multi-source information  
+- **Statistics**: Aircraft count timeline *(additional charts planned)* 🚧
+- **Coverage**: Signal strength analysis *(heatmaps under construction)* 🚧
+- **3D Radar**: Three-dimensional aircraft visualization *(controls under construction)* 🚧
+
+### 🚧 Features Under Construction
+Some advanced features are currently in development:
+- **Message Rate Charts**: Per-source message rate visualization
+- **Signal Strength Distribution**: Signal strength histogram analysis  
+- **Altitude Distribution**: Aircraft altitude distribution charts
+- **Interactive Heatmaps**: Leaflet.heat-based coverage heatmaps
+- **3D Radar Controls**: Interactive 3D view manipulation (reset, auto-rotate, range)
+- **Enhanced Error Notifications**: User-friendly toast notifications for issues
+
+## 🔧 Building
+
+### Prerequisites
+- Go 1.21 or later
+- Make
+
+### Build Commands
 
 ```bash
-# Foreground (default) - Press Ctrl+C to stop
+make build          # Build binary
-DUMP1090_HOST=192.168.1.100 ./skyview
+make deb            # Create Debian package  
-
+make docker-build   # Build Docker image
-# Daemon mode (background process)
+make test           # Run tests
-DUMP1090_HOST=192.168.1.100 ./skyview -daemon
+make clean          # Clean artifacts
-
-# With custom origin location
-DUMP1090_HOST=192.168.1.100 ORIGIN_LATITUDE=59.3293 ORIGIN_LONGITUDE=18.0686 ORIGIN_NAME="Stockholm" ./skyview
-
-# Using config file
-SKYVIEW_CONFIG=config.json ./skyview
-
-# Default (localhost:30003)
-./skyview
 ```
 
-### Development
+## 🐳 Docker
 
 ```bash
-go run main.go
+# Build
+make docker-build
+
+# Run  
+docker run -p 8080:8080 -v $(pwd)/config.json:/app/config.json skyview
 ```
 
-## Usage
+## 📊 API Reference
 
-1. Start your dump1090 instance
+### REST Endpoints
-2. Configure SkyView to point to your dump1090 host
+- `GET /api/aircraft` - All aircraft data
-3. Run SkyView
+- `GET /api/aircraft/{icao}` - Individual aircraft details
-4. Open your browser to `http://localhost:8080`
+- `GET /api/sources` - Data source information
+- `GET /api/stats` - System statistics
+- `GET /api/origin` - Map origin configuration
+- `GET /api/coverage/{sourceId}` - Coverage analysis
+- `GET /api/heatmap/{sourceId}` - Signal heatmap
 
-## API Endpoints
+### WebSocket
+- `ws://localhost:8080/ws` - Low-latency updates
 
-- `GET /`: Main web interface
+## 🛠️ Development
-- `GET /api/aircraft`: Aircraft data (parsed from dump1090 TCP stream)
-- `GET /api/stats`: Statistics data (calculated from aircraft data)
-- `GET /ws`: WebSocket endpoint for real-time updates
 
-## Data Sources
+### Project Structure
+```
+skyview/
+├── cmd/skyview/           # Main application
+├── assets/                # Embedded static web assets
+├── internal/
+│   ├── beast/             # Beast format parser
+│   ├── modes/             # Mode S decoder  
+│   ├── merger/            # Multi-source merger
+│   ├── client/            # Beast TCP clients
+│   └── server/            # HTTP/WebSocket server
+├── debian/                # Debian packaging
+└── scripts/               # Build scripts
+```
 
-SkyView connects to dump1090's **SBS-1/BaseStation format** via TCP port 30003 to receive decoded aircraft data in real-time.
+### Development Commands
+```bash
+make dev            # Run in development mode
+make format         # Format code
+make lint           # Run linter  
+make check          # Run all checks
+```
 
-The application maintains an in-memory aircraft database with automatic cleanup of stale aircraft (older than 2 minutes).
+## 📦 Deployment
 
-## Views
+### Systemd Service (Debian/Ubuntu)
+```bash
+# Install package
+sudo dpkg -i skyview_0.0.2_amd64.deb
 
-- **Map View**: Interactive map with aircraft positions and trails
+# Configure sources in /etc/skyview/config.json
-- **Table View**: Sortable table with aircraft details and search
+# Start service
-- **Stats View**: Dashboard with real-time statistics and charts
+sudo systemctl start skyview
+sudo systemctl enable skyview
+
+# Check status
+sudo systemctl status skyview
+sudo journalctl -u skyview -f
+```
+
+### Manual Installation
+```bash
+# Build binary
+make build
+
+# Create user and directories
+sudo useradd -r -s /bin/false skyview
+sudo mkdir -p /etc/skyview /var/lib/skyview /var/log/skyview
+sudo chown skyview:skyview /var/lib/skyview /var/log/skyview
+
+# Install binary and config
+sudo cp build/skyview /usr/bin/
+sudo cp config.example.json /etc/skyview/config.json
+sudo chown root:skyview /etc/skyview/config.json
+sudo chmod 640 /etc/skyview/config.json
+
+# Create systemd service
+sudo cp debian/lib/systemd/system/skyview.service /lib/systemd/system/
+sudo systemctl daemon-reload
+sudo systemctl enable skyview
+sudo systemctl start skyview
+```
+
+## 🔒 Security
+
+The application includes security hardening:
+- Runs as unprivileged user
+- Restricted filesystem access
+- Network isolation where possible
+- Systemd security features enabled
+
+## 📄 License
+
+MIT License - see [LICENSE](LICENSE) file for details.
+
+## 🤝 Contributing
+
+1. Fork the repository
+2. Create feature branch  
+3. Make changes with tests
+4. Submit pull request
+
+## 🆘 Support
+
+- [Issues](https://kode.naiv.no/olemd/skyview/issues)
+- [Documentation](https://kode.naiv.no/olemd/skyview/wiki)
+- [Configuration Examples](https://kode.naiv.no/olemd/skyview/src/branch/main/examples)
+
+---
+
+**SkyView** - Professional multi-source ADS-B tracking with Beast format support.

assets/assets.go

@@ -0,0 +1,32 @@
+// Package assets provides embedded static web assets for the SkyView application.
+//
+// This package uses Go 1.16+ embed functionality to include all static web files
+// directly in the compiled binary, eliminating the need for external file dependencies
+// at runtime. The embedded assets include:
+//   - index.html: Main web interface with aircraft tracking map
+//   - css/style.css: Styling for the web interface
+//   - js/app.js: JavaScript client for WebSocket communication and map rendering
+//   - icons/*.svg: Type-specific SVG icons for aircraft markers
+//   - favicon.ico: Browser icon
+//
+// The embedded filesystem is used by the HTTP server to serve static content
+// and enables single-binary deployment without external asset dependencies.
+package assets
+
+import "embed"
+
+// Static contains all embedded static web assets from the static/ directory.
+//
+// Files are embedded at build time and can be accessed using the standard
+// fs.FS interface. Path names within the embedded filesystem preserve the
+// directory structure, so files are accessed as:
+//   - "static/index.html"
+//   - "static/css/style.css"
+//   - "static/js/app.js"
+//   - etc.
+//
+// This approach ensures the web interface is always available without requiring
+// external file deployment or complicated asset management.
+//
+//go:embed static
+var Static embed.FS

assets/static/css/style.css

@@ -193,6 +193,48 @@ body {
     background: #404040;
 }
 
+.display-options {
+    position: absolute;
+    top: 320px;
+    right: 10px;
+    z-index: 1000;
+    background: rgba(45, 45, 45, 0.95);
+    border: 1px solid #404040;
+    border-radius: 8px;
+    padding: 1rem;
+    min-width: 200px;
+}
+
+.display-options h4 {
+    margin-bottom: 0.5rem;
+    color: #ffffff;
+    font-size: 0.9rem;
+}
+
+.option-group {
+    display: flex;
+    flex-direction: column;
+    gap: 0.5rem;
+}
+
+.option-group label {
+    display: flex;
+    align-items: center;
+    cursor: pointer;
+    font-size: 0.8rem;
+    color: #cccccc;
+}
+
+.option-group input[type="checkbox"] {
+    margin-right: 0.5rem;
+    accent-color: #00d4ff;
+    transform: scale(1.1);
+}
+
+.option-group label:hover {
+    color: #ffffff;
+}
+
 .legend {
     position: absolute;
     bottom: 10px;
@@ -226,11 +268,15 @@ body {
     border: 1px solid #ffffff;
 }
 
-.legend-icon.commercial { background: #00ff88; }
+.legend-icon.light { background: #00bfff; }      /* Sky blue for light aircraft */
-.legend-icon.cargo { background: #ff8c00; }
+.legend-icon.medium { background: #00ff88; }     /* Green for medium aircraft */
-.legend-icon.military { background: #ff4444; }
+.legend-icon.large { background: #ff8c00; }      /* Orange for large aircraft */
-.legend-icon.ga { background: #ffff00; }
+.legend-icon.high-vortex { background: #ff4500; } /* Red-orange for high vortex large */
-.legend-icon.ground { background: #888888; }
+.legend-icon.heavy { background: #ff0000; }      /* Red for heavy aircraft */
+.legend-icon.helicopter { background: #ff00ff; } /* Magenta for helicopters */
+.legend-icon.military { background: #ff4444; }   /* Red-orange for military */
+.legend-icon.ga { background: #ffff00; }         /* Yellow for general aviation */
+.legend-icon.ground { background: #888888; }     /* Gray for ground vehicles */
 
 .table-controls {
     display: flex;
@@ -362,20 +408,148 @@ body {
     z-index: 1000;
 }
 
+/* Leaflet popup override - ensure our styles take precedence */
+.leaflet-popup-content-wrapper {
+    background: #2d2d2d !important;
+    color: #ffffff !important;
+    border-radius: 8px;
+}
+
+.leaflet-popup-content {
+    margin: 12px !important;
+    color: #ffffff !important;
+}
+
+/* Under Construction Styles */
+.under-construction {
+    color: #ff8c00;
+    font-size: 0.8em;
+    font-weight: normal;
+    margin-left: 8px;
+}
+
+.construction-notice {
+    background: rgba(255, 140, 0, 0.1);
+    border: 1px solid #ff8c00;
+    border-radius: 4px;
+    padding: 8px;
+    margin: 8px 0;
+    font-size: 0.9em;
+    color: #ff8c00;
+    text-align: center;
+}
+
+/* Toast Notifications */
+.toast-notification {
+    position: fixed;
+    top: 20px;
+    right: 20px;
+    background: rgba(40, 40, 40, 0.95);
+    border: 1px solid #555;
+    border-radius: 6px;
+    padding: 12px 20px;
+    color: #ffffff;
+    font-size: 0.9em;
+    max-width: 300px;
+    z-index: 10000;
+    transform: translateX(320px);
+    transition: transform 0.3s ease-in-out;
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
+}
+
+.toast-notification.error {
+    border-color: #ff8c00;
+    background: rgba(255, 140, 0, 0.1);
+    color: #ff8c00;
+}
+
+.toast-notification.show {
+    transform: translateX(0);
+}
+
+/* Version Info */
+.version-info {
+    font-size: 0.6em;
+    color: #888;
+    font-weight: normal;
+    margin-left: 8px;
+}
+
+/* Repository Link */
+.repo-link {
+    color: #888;
+    text-decoration: none;
+    font-size: 0.7em;
+    margin-left: 6px;
+    opacity: 0.6;
+    transition: opacity 0.2s ease, color 0.2s ease;
+}
+
+.repo-link:hover {
+    color: #4a9eff;
+    opacity: 1;
+    text-decoration: none;
+}
+
+/* Collapsible Sections */
+.collapsible-header {
+    cursor: pointer;
+    user-select: none;
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin: 0 0 8px 0;
+    padding: 4px 0;
+    border-bottom: 1px solid #444;
+}
+
+.collapsible-header:hover {
+    color: #4a9eff;
+}
+
+.collapse-indicator {
+    font-size: 0.8em;
+    transition: transform 0.2s ease;
+    color: #888;
+}
+
+.collapsible-header.collapsed .collapse-indicator {
+    transform: rotate(-90deg);
+}
+
+.collapsible-content {
+    overflow: hidden;
+    transition: max-height 0.3s ease;
+    max-height: 200px;
+}
+
+.collapsible-content.collapsed {
+    max-height: 0;
+    margin: 0;
+    padding: 0;
+}
+
+.leaflet-popup-tip {
+    background: #2d2d2d !important;
+}
+
 .aircraft-popup {
     min-width: 300px;
     max-width: 400px;
+    color: #ffffff !important;
 }
 
 .popup-header {
     border-bottom: 1px solid #404040;
     padding-bottom: 0.5rem;
     margin-bottom: 0.75rem;
+    color: #ffffff !important;
 }
 
 .flight-info {
     font-size: 1.1rem;
     font-weight: bold;
+    color: #ffffff !important;
 }
 
 .icao-flag {
@@ -384,21 +558,27 @@ body {
 }
 
 .flight-id {
-    color: #00a8ff;
+    color: #00a8ff !important;
     font-family: monospace;
 }
 
 .callsign {
-    color: #00ff88;
+    color: #00ff88 !important;
 }
 
 .popup-details {
     font-size: 0.9rem;
+    color: #ffffff !important;
 }
 
 .detail-row {
     margin-bottom: 0.5rem;
     padding: 0.25rem 0;
+    color: #ffffff !important;
+}
+
+.detail-row strong {
+    color: #ffffff !important;
 }
 
 .detail-grid {
@@ -415,13 +595,27 @@ body {
 
 .detail-item .label {
     font-size: 0.8rem;
-    color: #888;
+    color: #888 !important;
     margin-bottom: 0.1rem;
 }
 
 .detail-item .value {
     font-weight: bold;
-    color: #ffffff;
+    color: #ffffff !important;
+}
+
+/* Ensure all values are visible with strong contrast */
+.aircraft-popup .value,
+.aircraft-popup .detail-row,
+.aircraft-popup .detail-item .value {
+    color: #ffffff !important;
+    text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
+}
+
+/* Style for N/A or empty values - still visible but slightly dimmed */
+.detail-item .value.no-data {
+    color: #aaaaaa !important;
+    font-style: italic;
 }
 
 @media (max-width: 768px) {

assets/static/icons/cargo.svg

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+  <g transform="translate(16,16)">
+    <!-- Wide-body cargo aircraft -->
+    <!-- Fuselage (wider) -->
+    <path d="M0,-14 L-2,-11 L-2,6 L-1.5,9 L0,10 L1.5,9 L2,6 L2,-11 Z" fill="currentColor"/>
+    <!-- Cargo door outline -->
+    <rect x="-1.5" y="-2" width="3" height="4" fill="none" stroke="currentColor" stroke-width="0.3" opacity="0.5"/>
+    <!-- Main wings (swept back more) -->
+    <path d="M-1.5,1 L-13,4 L-13,6 L-1.5,3.5 Z" fill="currentColor"/>
+    <path d="M1.5,1 L13,4 L13,6 L1.5,3.5 Z" fill="currentColor"/>
+    <!-- Winglets -->
+    <path d="M-13,4 L-13,2 L-12,4 Z" fill="currentColor"/>
+    <path d="M13,4 L13,2 L12,4 Z" fill="currentColor"/>
+    <!-- Tail wings (larger) -->
+    <path d="M-1,7 L-6,9 L-6,10 L-1,9 Z" fill="currentColor"/>
+    <path d="M1,7 L6,9 L6,10 L1,9 Z" fill="currentColor"/>
+    <!-- Vertical stabilizer (taller) -->
+    <path d="M0,5 L-0.7,5 L-3,10 L0,10 L3,10 L0.7,5 Z" fill="currentColor"/>
+    <!-- Nose cone (blunter for cargo) -->
+    <ellipse cx="0" cy="-13" rx="2" ry="2.5" fill="currentColor"/>
+    <!-- Engine nacelles (4 engines for heavy cargo) -->
+    <ellipse cx="-5" cy="2.5" rx="1.2" ry="2.2" fill="currentColor"/>
+    <ellipse cx="-8" cy="3" rx="1" ry="1.8" fill="currentColor"/>
+    <ellipse cx="5" cy="2.5" rx="1.2" ry="2.2" fill="currentColor"/>
+    <ellipse cx="8" cy="3" rx="1" ry="1.8" fill="currentColor"/>
+  </g>
+</svg>

assets/static/icons/commercial.svg

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+  <g transform="translate(16,16)">
+    <!-- Commercial airliner with more realistic proportions -->
+    <!-- Fuselage -->
+    <path d="M0,-14 L-1.5,-12 L-1.5,7 L-1,10 L0,11 L1,10 L1.5,7 L1.5,-12 Z" fill="currentColor"/>
+    <!-- Main wings -->
+    <path d="M-1,0 L-12,3 L-12,5 L-1,3 Z" fill="currentColor"/>
+    <path d="M1,0 L12,3 L12,5 L1,3 Z" fill="currentColor"/>
+    <!-- Tail wings (horizontal stabilizers) -->
+    <path d="M-0.8,8 L-5,9.5 L-5,10.5 L-0.8,9.5 Z" fill="currentColor"/>
+    <path d="M0.8,8 L5,9.5 L5,10.5 L0.8,9.5 Z" fill="currentColor"/>
+    <!-- Vertical stabilizer -->
+    <path d="M0,6 L-0.5,6 L-2,11 L0,11 L2,11 L0.5,6 Z" fill="currentColor"/>
+    <!-- Nose cone -->
+    <ellipse cx="0" cy="-13.5" rx="1.5" ry="2" fill="currentColor"/>
+    <!-- Engine nacelles -->
+    <ellipse cx="-4" cy="2" rx="1" ry="2" fill="currentColor"/>
+    <ellipse cx="4" cy="2" rx="1" ry="2" fill="currentColor"/>
+  </g>
+</svg>

assets/static/icons/ga.svg

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+  <g transform="translate(16,16)">
+    <!-- Small general aviation aircraft (Cessna-style) -->
+    <!-- Fuselage -->
+    <path d="M0,-12 L-1,-10 L-1,6 L-0.5,8 L0,9 L0.5,8 L1,6 L1,-10 Z" fill="currentColor"/>
+    <!-- High wings (typical of GA aircraft) -->
+    <path d="M-1,-2 L-10,0 L-10,1.5 L-1,0 Z" fill="currentColor"/>
+    <path d="M1,-2 L10,0 L10,1.5 L1,0 Z" fill="currentColor"/>
+    <!-- Wing struts -->
+    <path d="M-1,2 L-6,-1" stroke="currentColor" stroke-width="0.5"/>
+    <path d="M1,2 L6,-1" stroke="currentColor" stroke-width="0.5"/>
+    <!-- Tail wings -->
+    <path d="M-0.5,6 L-3.5,7.5 L-3.5,8.5 L-0.5,7.5 Z" fill="currentColor"/>
+    <path d="M0.5,6 L3.5,7.5 L3.5,8.5 L0.5,7.5 Z" fill="currentColor"/>
+    <!-- Vertical stabilizer -->
+    <path d="M0,5 L-0.4,5 L-1.5,9 L0,9 L1.5,9 L0.4,5 Z" fill="currentColor"/>
+    <!-- Propeller spinner -->
+    <circle cx="0" cy="-12" r="1.5" fill="currentColor"/>
+    <!-- Propeller blades -->
+    <path d="M-4,-12 L4,-12" stroke="currentColor" stroke-width="1" opacity="0.3"/>
+    <!-- Landing gear -->
+    <circle cx="-1" cy="5" r="0.8" fill="currentColor"/>
+    <circle cx="1" cy="5" r="0.8" fill="currentColor"/>
+    <circle cx="0" cy="-8" r="0.6" fill="currentColor"/>
+  </g>
+</svg>

assets/static/icons/ground.svg

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+  <g transform="translate(16,16)">
+    <!-- Airport ground service vehicle -->
+    <!-- Main body -->
+    <path d="M-6,-3 L-6,3 L6,3 L6,-1 L4,-3 Z" fill="currentColor"/>
+    <!-- Cab/cockpit -->
+    <path d="M4,-3 L4,1 L6,1 L6,-1 Z" fill="currentColor" opacity="0.8"/>
+    <!-- Windows -->
+    <rect x="4.5" y="-2.5" width="1" height="1.5" fill="currentColor" opacity="0.5"/>
+    <!-- Cargo area -->
+    <rect x="-5" y="-2" width="7" height="3" fill="none" stroke="currentColor" stroke-width="0.3" opacity="0.5"/>
+    <!-- Wheels -->
+    <circle cx="-4" cy="4" r="1.5" fill="currentColor" opacity="0.7"/>
+    <circle cx="-1" cy="4" r="1.5" fill="currentColor" opacity="0.7"/>
+    <circle cx="4" cy="4" r="1.5" fill="currentColor" opacity="0.7"/>
+    <!-- Wheel details -->
+    <circle cx="-4" cy="4" r="0.5" fill="currentColor" opacity="0.4"/>
+    <circle cx="-1" cy="4" r="0.5" fill="currentColor" opacity="0.4"/>
+    <circle cx="4" cy="4" r="0.5" fill="currentColor" opacity="0.4"/>
+    <!-- Beacon light on top -->
+    <rect x="-1" y="-4" width="2" height="1" fill="currentColor" opacity="0.6"/>
+  </g>
+</svg>

assets/static/icons/helicopter.svg

@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+  <g transform="translate(16,16)">
+    <!-- Main rotor disc (animated feel) -->
+    <ellipse cx="0" cy="-2" rx="11" ry="1" fill="currentColor" opacity="0.2"/>
+    <path d="M-11,-2 L11,-2" stroke="currentColor" stroke-width="0.5" opacity="0.4"/>
+    <path d="M0,-13 L0,9" stroke="currentColor" stroke-width="0.5" opacity="0.4"/>
+    
+    <!-- Main fuselage -->
+    <path d="M0,-8 C-3,-8 -4,-6 -4,-3 L-4,4 C-4,6 -3,7 -1,7 L1,7 C3,7 4,6 4,4 L4,-3 C4,-6 3,-8 0,-8 Z" fill="currentColor"/>
+    
+    <!-- Cockpit windscreen -->
+    <path d="M0,-8 C-2,-8 -3,-7 -3,-5 L-3,-3 L3,-3 L3,-5 C3,-7 2,-8 0,-8 Z" fill="currentColor" opacity="0.7"/>
+    
+    <!-- Tail boom -->
+    <rect x="-1" y="6" width="2" height="8" fill="currentColor"/>
+    
+    <!-- Tail rotor -->
+    <ellipse cx="0" cy="13" rx="1" ry="3" fill="currentColor"/>
+    <path d="M-3,13 L3,13" stroke="currentColor" stroke-width="0.8"/>
+    
+    <!-- Landing skids -->
+    <path d="M-3,7 L-3,9 L-1,9" stroke="currentColor" stroke-width="1" fill="none"/>
+    <path d="M3,7 L3,9 L1,9" stroke="currentColor" stroke-width="1" fill="none"/>
+    
+    <!-- Rotor hub -->
+    <circle cx="0" cy="-2" r="1" fill="currentColor"/>
+  </g>
+</svg>

assets/static/icons/military.svg

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+  <g transform="translate(16,16)">
+    <!-- Fighter jet with delta wings -->
+    <!-- Fuselage -->
+    <path d="M0,-14 L-0.8,-11 L-0.8,8 L0,10 L0.8,8 L0.8,-11 Z" fill="currentColor"/>
+    <!-- Delta wings (swept back aggressively) -->
+    <path d="M-0.8,2 L-10,8 L-9,9 L-0.8,5 Z" fill="currentColor"/>
+    <path d="M0.8,2 L10,8 L9,9 L0.8,5 Z" fill="currentColor"/>
+    <!-- Canards (small forward wings) -->
+    <path d="M-0.5,-4 L-3,-3 L-3,-2 L-0.5,-3 Z" fill="currentColor"/>
+    <path d="M0.5,-4 L3,-3 L3,-2 L0.5,-3 Z" fill="currentColor"/>
+    <!-- Vertical stabilizers (twin tails) -->
+    <path d="M-1,6 L-1.5,6 L-2.5,10 L-1,10 Z" fill="currentColor"/>
+    <path d="M1,6 L1.5,6 L2.5,10 L1,10 Z" fill="currentColor"/>
+    <!-- Nose cone (pointed) -->
+    <path d="M0,-14 L-0.8,-11 L0,-10 L0.8,-11 Z" fill="currentColor"/>
+    <!-- Air intakes -->
+    <rect x="-1.5" y="-2" width="0.7" height="3" fill="currentColor" opacity="0.7"/>
+    <rect x="0.8" y="-2" width="0.7" height="3" fill="currentColor" opacity="0.7"/>
+    <!-- Weapons hardpoints -->
+    <rect x="-5" y="6" width="0.5" height="2" fill="currentColor"/>
+    <rect x="4.5" y="6" width="0.5" height="2" fill="currentColor"/>
+    <!-- Exhaust nozzle -->
+    <ellipse cx="0" cy="9" rx="0.8" ry="1.5" fill="currentColor" opacity="0.8"/>
+  </g>
+</svg>

assets/static/index.html

@@ -0,0 +1,265 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>SkyView - Multi-Source ADS-B Aircraft Tracker</title>
+    <link rel="icon" type="image/x-icon" href="/favicon.ico">
+    
+    <!-- Leaflet CSS -->
+    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" />
+    
+    <!-- Chart.js -->
+    <script src="https://cdn.jsdelivr.net/npm/chart.js@4.4.0/dist/chart.umd.js"></script>
+    
+    <!-- Three.js for 3D radar (ES modules) -->
+    <script type="importmap">
+    {
+        "imports": {
+            "three": "https://cdn.jsdelivr.net/npm/three@0.158.0/build/three.module.js",
+            "three/addons/": "https://cdn.jsdelivr.net/npm/three@0.158.0/examples/jsm/"
+        }
+    }
+    </script>
+    
+    <!-- Custom CSS -->
+    <link rel="stylesheet" href="/static/css/style.css">
+</head>
+<body>
+    <div id="app">
+        <header class="header">
+            <h1>SkyView <span class="version-info">v0.0.2</span> <a href="https://kode.naiv.no/olemd/skyview" target="_blank" class="repo-link" title="Project Repository">⚙</a></h1>
+            
+            <!-- Status indicators -->
+            <div class="status-section">
+                <div class="clock-display">
+                    <div class="clock" id="utc-clock">
+                        <div class="clock-face">
+                            <div class="clock-hand hour-hand" id="utc-hour"></div>
+                            <div class="clock-hand minute-hand" id="utc-minute"></div>
+                        </div>
+                        <div class="clock-label">UTC</div>
+                    </div>
+                    <div class="clock" id="update-clock">
+                        <div class="clock-face">
+                            <div class="clock-hand hour-hand" id="update-hour"></div>
+                            <div class="clock-hand minute-hand" id="update-minute"></div>
+                        </div>
+                        <div class="clock-label">Last Update</div>
+                    </div>
+                </div>
+            </div>
+            
+            <!-- Summary stats -->
+            <div class="stats-summary">
+                <span id="aircraft-count">0 aircraft</span>
+                <span id="sources-count">0 sources</span>
+                <span id="connection-status" class="connection-status disconnected">Connecting...</span>
+            </div>
+        </header>
+
+        <main class="main-content">
+            <!-- View selection tabs -->
+            <div class="view-toggle">
+                <button id="map-view-btn" class="view-btn active">Map</button>
+                <button id="table-view-btn" class="view-btn">Table</button>
+                <button id="stats-view-btn" class="view-btn">Statistics</button>
+                <button id="coverage-view-btn" class="view-btn">Coverage</button>
+                <button id="radar3d-view-btn" class="view-btn">3D Radar</button>
+            </div>
+
+            <!-- Map View -->
+            <div id="map-view" class="view active">
+                <div id="map"></div>
+                
+                <!-- Map controls -->
+                <div class="map-controls">
+                    <button id="center-map" title="Center on aircraft">Center Map</button>
+                    <button id="reset-map" title="Reset to origin">Reset Map</button>
+                    <button id="toggle-trails" title="Show/hide aircraft trails">Show Trails</button>
+                    <button id="toggle-sources" title="Show/hide source locations">Show Sources</button>
+                    <button id="toggle-dark-mode" title="Toggle dark/light mode">🌙 Night Mode</button>
+                </div>
+                
+                <!-- Options -->
+                <div class="display-options">
+                    <h4 class="collapsible-header collapsed" id="display-options-header">
+                        <span>Options</span>
+                        <span class="collapse-indicator">▼</span>
+                    </h4>
+                    <div class="option-group collapsible-content collapsed" id="display-options-content">
+                        <label>
+                            <input type="checkbox" id="show-site-positions" checked>
+                            <span>Site Positions</span>
+                        </label>
+                        <label>
+                            <input type="checkbox" id="show-range-rings">
+                            <span>Range Rings</span>
+                        </label>
+                        <label>
+                            <input type="checkbox" id="show-selected-trail">
+                            <span>Selected Aircraft Trail</span>
+                        </label>
+                    </div>
+                </div>
+                
+                <!-- Legend -->
+                <div class="legend">
+                    <h4>ADS-B Categories</h4>
+                    <div class="legend-item">
+                        <span class="legend-icon light"></span>
+                        <span>Light &lt; 7000kg</span>
+                    </div>
+                    <div class="legend-item">
+                        <span class="legend-icon medium"></span>
+                        <span>Medium 7000-34000kg</span>
+                    </div>
+                    <div class="legend-item">
+                        <span class="legend-icon large"></span>
+                        <span>Large 34000-136000kg</span>
+                    </div>
+                    <div class="legend-item">
+                        <span class="legend-icon high-vortex"></span>
+                        <span>High Vortex Large</span>
+                    </div>
+                    <div class="legend-item">
+                        <span class="legend-icon heavy"></span>
+                        <span>Heavy &gt; 136000kg</span>
+                    </div>
+                    <div class="legend-item">
+                        <span class="legend-icon helicopter"></span>
+                        <span>Rotorcraft</span>
+                    </div>
+                    <div class="legend-item">
+                        <span class="legend-icon ga"></span>
+                        <span>Glider/Ultralight</span>
+                    </div>
+                    <div class="legend-item">
+                        <span class="legend-icon ground"></span>
+                        <span>Surface Vehicle</span>
+                    </div>
+                    
+                    <h4>Sources</h4>
+                    <div id="sources-legend"></div>
+                </div>
+            </div>
+
+            <!-- Table View -->
+            <div id="table-view" class="view">
+                <div class="table-controls">
+                    <input type="text" id="search-input" placeholder="Search by flight, ICAO, or squawk...">
+                    <select id="sort-select">
+                        <option value="distance">Distance</option>
+                        <option value="altitude">Altitude</option>
+                        <option value="speed">Speed</option>
+                        <option value="flight">Flight</option>
+                        <option value="icao">ICAO</option>
+                        <option value="squawk">Squawk</option>
+                        <option value="signal">Signal</option>
+                        <option value="age">Age</option>
+                    </select>
+                    <select id="source-filter">
+                        <option value="">All Sources</option>
+                    </select>
+                </div>
+                <div class="table-container">
+                    <table id="aircraft-table">
+                        <thead>
+                            <tr>
+                                <th>ICAO</th>
+                                <th>Flight</th>
+                                <th>Squawk</th>
+                                <th>Altitude</th>
+                                <th>Speed</th>
+                                <th>Distance</th>
+                                <th>Track</th>
+                                <th>Sources</th>
+                                <th>Signal</th>
+                                <th>Age</th>
+                            </tr>
+                        </thead>
+                        <tbody id="aircraft-tbody">
+                        </tbody>
+                    </table>
+                </div>
+            </div>
+
+            <!-- Statistics View -->
+            <div id="stats-view" class="view">
+                <div class="stats-grid">
+                    <div class="stat-card">
+                        <h3>Total Aircraft</h3>
+                        <div class="stat-value" id="total-aircraft">0</div>
+                    </div>
+                    <div class="stat-card">
+                        <h3>Active Sources</h3>
+                        <div class="stat-value" id="active-sources">0</div>
+                    </div>
+                    <div class="stat-card">
+                        <h3>Messages/sec</h3>
+                        <div class="stat-value" id="messages-sec">0</div>
+                    </div>
+                    <div class="stat-card">
+                        <h3>Max Range</h3>
+                        <div class="stat-value" id="max-range">0 km</div>
+                    </div>
+                </div>
+                
+                <!-- Charts -->
+                <div class="charts-container">
+                    <div class="chart-card">
+                        <h3>Aircraft Count Timeline</h3>
+                        <canvas id="aircraft-chart"></canvas>
+                    </div>
+                    <div class="chart-card">
+                        <h3>Message Rate by Source <span class="under-construction">🚧 Under Construction</span></h3>
+                        <canvas id="message-chart"></canvas>
+                        <div class="construction-notice">This chart is planned but not yet implemented</div>
+                    </div>
+                    <div class="chart-card">
+                        <h3>Signal Strength Distribution <span class="under-construction">🚧 Under Construction</span></h3>
+                        <canvas id="signal-chart"></canvas>
+                        <div class="construction-notice">This chart is planned but not yet implemented</div>
+                    </div>
+                    <div class="chart-card">
+                        <h3>Altitude Distribution <span class="under-construction">🚧 Under Construction</span></h3>
+                        <canvas id="altitude-chart"></canvas>
+                        <div class="construction-notice">This chart is planned but not yet implemented</div>
+                    </div>
+                </div>
+            </div>
+
+            <!-- Coverage View -->
+            <div id="coverage-view" class="view">
+                <div class="coverage-controls">
+                    <select id="coverage-source">
+                        <option value="">Select Source</option>
+                    </select>
+                    <button id="toggle-heatmap">Toggle Heatmap</button>
+                </div>
+                <div id="coverage-map"></div>
+            </div>
+
+            <!-- 3D Radar View -->
+            <div id="radar3d-view" class="view">
+                <div class="radar3d-controls">
+                    <div class="construction-notice">🚧 3D Controls Under Construction</div>
+                    <button id="radar3d-reset" disabled>Reset View</button>
+                    <button id="radar3d-auto-rotate" disabled>Auto Rotate</button>
+                    <label>
+                        <input type="range" id="radar3d-range" min="10" max="500" value="100" disabled>
+                        Range: <span id="radar3d-range-value">100</span> km
+                    </label>
+                </div>
+                <div id="radar3d-container"></div>
+            </div>
+        </main>
+    </div>
+
+    <!-- Leaflet JS -->
+    <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
+    
+    <!-- Custom JS -->
+    <script type="module" src="/static/js/app.js?v=4"></script>
+</body>
+</html>

assets/static/js/app.js

@@ -0,0 +1,506 @@
+// Import Three.js modules
+import * as THREE from 'three';
+import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
+
+// Import our modular components
+import { WebSocketManager } from './modules/websocket.js?v=2';
+import { AircraftManager } from './modules/aircraft-manager.js?v=2';
+import { MapManager } from './modules/map-manager.js?v=2';
+import { UIManager } from './modules/ui-manager.js?v=2';
+
+class SkyView {
+    constructor() {
+        // Initialize managers
+        this.wsManager = null;
+        this.aircraftManager = null;
+        this.mapManager = null;
+        this.uiManager = null;
+        
+        // 3D Radar
+        this.radar3d = null;
+        
+        // Charts
+        this.charts = {};
+        
+        // Selected aircraft tracking
+        this.selectedAircraft = null;
+        this.selectedTrailEnabled = false;
+        
+        this.init();
+    }
+
+    async init() {
+        try {
+            
+            // Initialize UI manager first
+            this.uiManager = new UIManager();
+            this.uiManager.initializeViews();
+            this.uiManager.initializeEventListeners();
+            
+            // Initialize map manager and get the main map
+            this.mapManager = new MapManager();
+            const map = await this.mapManager.initializeMap();
+            
+            // Initialize aircraft manager with the map
+            this.aircraftManager = new AircraftManager(map);
+            
+            // Set up selected aircraft trail callback
+            this.aircraftManager.setSelectedAircraftCallback((icao) => {
+                return this.selectedTrailEnabled && this.selectedAircraft === icao;
+            });
+            
+            // Initialize WebSocket with callbacks
+            this.wsManager = new WebSocketManager(
+                (message) => this.handleWebSocketMessage(message),
+                (status) => this.uiManager.updateConnectionStatus(status)
+            );
+            
+            await this.wsManager.connect();
+            
+            // Initialize other components
+            this.initializeCharts();
+            this.uiManager.updateClocks();
+            this.initialize3DRadar();
+            
+            // Set up map controls
+            this.setupMapControls();
+            
+            // Set up aircraft selection listener
+            this.setupAircraftSelection();
+            
+            this.startPeriodicTasks();
+            
+        } catch (error) {
+            console.error('Initialization failed:', error);
+            this.uiManager.showError('Failed to initialize application');
+        }
+    }
+
+    setupMapControls() {
+        const centerMapBtn = document.getElementById('center-map');
+        const resetMapBtn = document.getElementById('reset-map');
+        const toggleTrailsBtn = document.getElementById('toggle-trails');
+        const toggleSourcesBtn = document.getElementById('toggle-sources');
+        
+        if (centerMapBtn) {
+            centerMapBtn.addEventListener('click', () => {
+                this.aircraftManager.centerMapOnAircraft(() => this.mapManager.getSourcePositions());
+            });
+        }
+        
+        if (resetMapBtn) {
+            resetMapBtn.addEventListener('click', () => this.mapManager.resetMap());
+        }
+        
+        if (toggleTrailsBtn) {
+            toggleTrailsBtn.addEventListener('click', () => {
+                const showTrails = this.aircraftManager.toggleTrails();
+                toggleTrailsBtn.textContent = showTrails ? 'Hide Trails' : 'Show Trails';
+            });
+        }
+        
+        
+        if (toggleSourcesBtn) {
+            toggleSourcesBtn.addEventListener('click', () => {
+                const showSources = this.mapManager.toggleSources();
+                toggleSourcesBtn.textContent = showSources ? 'Hide Sources' : 'Show Sources';
+            });
+        }
+        
+        // Setup collapsible sections
+        this.setupCollapsibleSections();
+        
+        const toggleDarkModeBtn = document.getElementById('toggle-dark-mode');
+        if (toggleDarkModeBtn) {
+            toggleDarkModeBtn.addEventListener('click', () => {
+                const isDarkMode = this.mapManager.toggleDarkMode();
+                toggleDarkModeBtn.innerHTML = isDarkMode ? '☀️ Light Mode' : '🌙 Night Mode';
+            });
+        }
+        
+        // Coverage controls
+        const toggleHeatmapBtn = document.getElementById('toggle-heatmap');
+        const coverageSourceSelect = document.getElementById('coverage-source');
+        
+        if (toggleHeatmapBtn) {
+            toggleHeatmapBtn.addEventListener('click', async () => {
+                const isActive = await this.mapManager.toggleHeatmap();
+                toggleHeatmapBtn.textContent = isActive ? 'Hide Heatmap' : 'Show Heatmap';
+            });
+        }
+        
+        if (coverageSourceSelect) {
+            coverageSourceSelect.addEventListener('change', (e) => {
+                this.mapManager.setSelectedSource(e.target.value);
+                this.mapManager.updateCoverageDisplay();
+            });
+        }
+        
+        // Display option checkboxes
+        const sitePositionsCheckbox = document.getElementById('show-site-positions');
+        const rangeRingsCheckbox = document.getElementById('show-range-rings');
+        const selectedTrailCheckbox = document.getElementById('show-selected-trail');
+        
+        if (sitePositionsCheckbox) {
+            sitePositionsCheckbox.addEventListener('change', (e) => {
+                if (e.target.checked) {
+                    this.mapManager.showSources = true;
+                    this.mapManager.updateSourceMarkers();
+                } else {
+                    this.mapManager.showSources = false;
+                    this.mapManager.sourceMarkers.forEach(marker => this.mapManager.map.removeLayer(marker));
+                    this.mapManager.sourceMarkers.clear();
+                }
+            });
+        }
+        
+        if (rangeRingsCheckbox) {
+            rangeRingsCheckbox.addEventListener('change', (e) => {
+                if (e.target.checked) {
+                    this.mapManager.showRange = true;
+                    this.mapManager.updateRangeCircles();
+                } else {
+                    this.mapManager.showRange = false;
+                    this.mapManager.rangeCircles.forEach(circle => this.mapManager.map.removeLayer(circle));
+                    this.mapManager.rangeCircles.clear();
+                }
+            });
+        }
+        
+        if (selectedTrailCheckbox) {
+            selectedTrailCheckbox.addEventListener('change', (e) => {
+                this.selectedTrailEnabled = e.target.checked;
+                if (!e.target.checked && this.selectedAircraft) {
+                    // Hide currently selected aircraft trail
+                    this.aircraftManager.hideAircraftTrail(this.selectedAircraft);
+                } else if (e.target.checked && this.selectedAircraft) {
+                    // Show currently selected aircraft trail
+                    this.aircraftManager.showAircraftTrail(this.selectedAircraft);
+                }
+            });
+        }
+    }
+
+    setupAircraftSelection() {
+        document.addEventListener('aircraftSelected', (e) => {
+            const { icao, aircraft } = e.detail;
+            this.uiManager.switchView('map-view');
+            
+            // Hide trail for previously selected aircraft
+            if (this.selectedAircraft && this.selectedTrailEnabled) {
+                this.aircraftManager.hideAircraftTrail(this.selectedAircraft);
+            }
+            
+            // Update selected aircraft
+            this.selectedAircraft = icao;
+            
+            // Automatically enable selected aircraft trail when an aircraft is selected
+            if (!this.selectedTrailEnabled) {
+                this.selectedTrailEnabled = true;
+                const selectedTrailCheckbox = document.getElementById('show-selected-trail');
+                if (selectedTrailCheckbox) {
+                    selectedTrailCheckbox.checked = true;
+                }
+            }
+            
+            // Show trail for newly selected aircraft
+            this.aircraftManager.showAircraftTrail(icao);
+            
+            // DON'T change map view - just open popup like Leaflet expects
+            if (this.mapManager.map && aircraft.Latitude && aircraft.Longitude) {
+                const marker = this.aircraftManager.aircraftMarkers.get(icao);
+                if (marker) {
+                    marker.openPopup();
+                }
+            }
+        });
+    }
+
+    handleWebSocketMessage(message) {
+        switch (message.type) {
+            case 'initial_data':
+                this.updateData(message.data);
+                // Setup source markers only on initial data load
+                this.mapManager.updateSourceMarkers();
+                break;
+            case 'aircraft_update':
+                this.updateData(message.data);
+                break;
+            default:
+        }
+    }
+
+    updateData(data) {
+        // Update all managers with new data
+        this.uiManager.updateData(data);
+        this.aircraftManager.updateAircraftData(data);
+        this.mapManager.updateSourcesData(data);
+        
+        // Update UI components
+        this.aircraftManager.updateMarkers();
+        this.uiManager.updateAircraftTable();
+        this.uiManager.updateStatistics();
+        this.uiManager.updateHeaderInfo();
+        
+        // Clear selected aircraft if it no longer exists
+        if (this.selectedAircraft && !this.aircraftManager.aircraftData.has(this.selectedAircraft)) {
+            this.selectedAircraft = null;
+        }
+        
+        // Update coverage controls
+        this.mapManager.updateCoverageControls();
+        
+        if (this.uiManager.currentView === 'radar3d-view') {
+            this.update3DRadar();
+        }
+    }
+
+    // View switching
+    async switchView(viewId) {
+        const actualViewId = this.uiManager.switchView(viewId);
+        
+        // Handle view-specific initialization
+        const baseName = actualViewId.replace('-view', '');
+        switch (baseName) {
+            case 'coverage':
+                await this.mapManager.initializeCoverageMap();
+                break;
+            case 'radar3d':
+                this.update3DRadar();
+                break;
+        }
+    }
+
+    // Charts
+    initializeCharts() {
+        const aircraftChartCanvas = document.getElementById('aircraft-chart');
+        if (!aircraftChartCanvas) {
+            console.warn('Aircraft chart canvas not found');
+            return;
+        }
+        
+        try {
+            this.charts.aircraft = new Chart(aircraftChartCanvas, {
+                type: 'line',
+                data: {
+                    labels: [],
+                    datasets: [{
+                        label: 'Aircraft Count',
+                        data: [],
+                        borderColor: '#00d4ff',
+                        backgroundColor: 'rgba(0, 212, 255, 0.1)',
+                        tension: 0.4
+                    }]
+                },
+                options: {
+                    responsive: true,
+                    maintainAspectRatio: false,
+                    plugins: {
+                        legend: { display: false }
+                    },
+                    scales: {
+                        x: { display: false },
+                        y: { 
+                            beginAtZero: true,
+                            ticks: { color: '#888' }
+                        }
+                    }
+                }
+            });
+        } catch (error) {
+            console.warn('Chart.js not available, skipping charts initialization');
+        }
+    }
+
+    updateCharts() {
+        if (!this.charts.aircraft) return;
+        
+        const now = new Date();
+        const timeLabel = now.toLocaleTimeString();
+        
+        // Update aircraft count chart
+        const chart = this.charts.aircraft;
+        chart.data.labels.push(timeLabel);
+        chart.data.datasets[0].data.push(this.aircraftManager.aircraftData.size);
+        
+        if (chart.data.labels.length > 20) {
+            chart.data.labels.shift();
+            chart.data.datasets[0].data.shift();
+        }
+        
+        chart.update('none');
+    }
+
+    // 3D Radar (basic implementation)
+    initialize3DRadar() {
+        try {
+            const container = document.getElementById('radar3d-container');
+            if (!container) return;
+            
+            // Create scene
+            this.radar3d = {
+                scene: new THREE.Scene(),
+                camera: new THREE.PerspectiveCamera(75, container.clientWidth / container.clientHeight, 0.1, 1000),
+                renderer: new THREE.WebGLRenderer({ alpha: true, antialias: true }),
+                controls: null,
+                aircraftMeshes: new Map()
+            };
+            
+            // Set up renderer
+            this.radar3d.renderer.setSize(container.clientWidth, container.clientHeight);
+            this.radar3d.renderer.setClearColor(0x0a0a0a, 0.9);
+            container.appendChild(this.radar3d.renderer.domElement);
+            
+            // Add lighting
+            const ambientLight = new THREE.AmbientLight(0x404040, 0.6);
+            this.radar3d.scene.add(ambientLight);
+            
+            const directionalLight = new THREE.DirectionalLight(0xffffff, 0.8);
+            directionalLight.position.set(10, 10, 5);
+            this.radar3d.scene.add(directionalLight);
+            
+            // Set up camera
+            this.radar3d.camera.position.set(0, 50, 50);
+            this.radar3d.camera.lookAt(0, 0, 0);
+            
+            // Add controls
+            this.radar3d.controls = new OrbitControls(this.radar3d.camera, this.radar3d.renderer.domElement);
+            this.radar3d.controls.enableDamping = true;
+            this.radar3d.controls.dampingFactor = 0.05;
+            
+            // Add ground plane
+            const groundGeometry = new THREE.PlaneGeometry(200, 200);
+            const groundMaterial = new THREE.MeshLambertMaterial({ 
+                color: 0x2a4d3a, 
+                transparent: true, 
+                opacity: 0.5 
+            });
+            const ground = new THREE.Mesh(groundGeometry, groundMaterial);
+            ground.rotation.x = -Math.PI / 2;
+            this.radar3d.scene.add(ground);
+            
+            // Add grid
+            const gridHelper = new THREE.GridHelper(200, 20, 0x44aa44, 0x44aa44);
+            this.radar3d.scene.add(gridHelper);
+            
+            // Start render loop
+            this.render3DRadar();
+            
+        } catch (error) {
+            console.error('Failed to initialize 3D radar:', error);
+        }
+    }
+
+    update3DRadar() {
+        if (!this.radar3d || !this.radar3d.scene || !this.aircraftManager) return;
+        
+        try {
+            // Update aircraft positions in 3D space
+            this.aircraftManager.aircraftData.forEach((aircraft, icao) => {
+                if (aircraft.Latitude && aircraft.Longitude) {
+                    const key = icao.toString();
+                    
+                    if (!this.radar3d.aircraftMeshes.has(key)) {
+                        // Create new aircraft mesh
+                        const geometry = new THREE.ConeGeometry(0.5, 2, 6);
+                        const material = new THREE.MeshLambertMaterial({ color: 0x00ff00 });
+                        const mesh = new THREE.Mesh(geometry, material);
+                        this.radar3d.aircraftMeshes.set(key, mesh);
+                        this.radar3d.scene.add(mesh);
+                    }
+                    
+                    const mesh = this.radar3d.aircraftMeshes.get(key);
+                    
+                    // Convert lat/lon to local coordinates (simplified)
+                    const x = (aircraft.Longitude - (-0.4600)) * 111320 * Math.cos(aircraft.Latitude * Math.PI / 180) / 1000;
+                    const z = -(aircraft.Latitude - 51.4700) * 111320 / 1000;
+                    const y = (aircraft.Altitude || 0) / 1000; // Convert feet to km for display
+                    
+                    mesh.position.set(x, y, z);
+                    
+                    // Orient mesh based on track
+                    if (aircraft.Track !== undefined) {
+                        mesh.rotation.y = -aircraft.Track * Math.PI / 180;
+                    }
+                }
+            });
+            
+            // Remove old aircraft
+            this.radar3d.aircraftMeshes.forEach((mesh, key) => {
+                if (!this.aircraftManager.aircraftData.has(key)) {
+                    this.radar3d.scene.remove(mesh);
+                    this.radar3d.aircraftMeshes.delete(key);
+                }
+            });
+        } catch (error) {
+            console.error('Failed to update 3D radar:', error);
+        }
+    }
+
+    render3DRadar() {
+        if (!this.radar3d) return;
+        
+        requestAnimationFrame(() => this.render3DRadar());
+        
+        if (this.radar3d.controls) {
+            this.radar3d.controls.update();
+        }
+        
+        this.radar3d.renderer.render(this.radar3d.scene, this.radar3d.camera);
+    }
+
+    startPeriodicTasks() {
+        // Update clocks every second
+        setInterval(() => this.uiManager.updateClocks(), 1000);
+        
+        // Update charts every 10 seconds
+        setInterval(() => this.updateCharts(), 10000);
+        
+        // Periodic cleanup
+        setInterval(() => {
+            // Clean up old trail data, etc.
+        }, 30000);
+    }
+    
+    setupCollapsibleSections() {
+        // Setup Display Options collapsible
+        const displayHeader = document.getElementById('display-options-header');
+        const displayContent = document.getElementById('display-options-content');
+        
+        if (displayHeader && displayContent) {
+            displayHeader.addEventListener('click', () => {
+                const isCollapsed = displayContent.classList.contains('collapsed');
+                
+                if (isCollapsed) {
+                    // Expand
+                    displayContent.classList.remove('collapsed');
+                    displayHeader.classList.remove('collapsed');
+                } else {
+                    // Collapse
+                    displayContent.classList.add('collapsed');
+                    displayHeader.classList.add('collapsed');
+                }
+                
+                // Save state to localStorage
+                localStorage.setItem('displayOptionsCollapsed', !isCollapsed);
+            });
+            
+            // Restore saved state (default to collapsed)
+            const savedState = localStorage.getItem('displayOptionsCollapsed');
+            const shouldCollapse = savedState === null ? true : savedState === 'true';
+            
+            if (shouldCollapse) {
+                displayContent.classList.add('collapsed');
+                displayHeader.classList.add('collapsed');
+            } else {
+                displayContent.classList.remove('collapsed');
+                displayHeader.classList.remove('collapsed');
+            }
+        }
+    }
+}
+
+// Initialize application when DOM is ready
+document.addEventListener('DOMContentLoaded', () => {
+    window.skyview = new SkyView();
+});

assets/static/js/modules/aircraft-manager.js

@@ -0,0 +1,527 @@
+// Aircraft marker and data management module
+export class AircraftManager {
+    constructor(map) {
+        this.map = map;
+        this.aircraftData = new Map();
+        this.aircraftMarkers = new Map();
+        this.aircraftTrails = new Map();
+        this.showTrails = false;
+        
+        // Debug: Track marker lifecycle
+        this.markerCreateCount = 0;
+        this.markerUpdateCount = 0;
+        this.markerRemoveCount = 0;
+        
+        // SVG icon cache
+        this.iconCache = new Map();
+        this.loadIcons();
+        
+        // Selected aircraft trail tracking
+        this.selectedAircraftCallback = null;
+        
+        // Map event listeners removed - let Leaflet handle positioning naturally
+    }
+
+    async loadIcons() {
+        const iconTypes = ['commercial', 'helicopter', 'military', 'cargo', 'ga', 'ground'];
+        
+        for (const type of iconTypes) {
+            try {
+                const response = await fetch(`/static/icons/${type}.svg`);
+                const svgText = await response.text();
+                this.iconCache.set(type, svgText);
+            } catch (error) {
+                console.warn(`Failed to load icon for ${type}:`, error);
+                // Fallback to inline SVG if needed
+                this.iconCache.set(type, this.createFallbackIcon(type));
+            }
+        }
+    }
+
+    createFallbackIcon(type) {
+        // Fallback inline SVG if file loading fails
+        const color = 'currentColor';
+        let path = '';
+        
+        switch (type) {
+            case 'helicopter':
+                path = `<circle cx="0" cy="0" r="10" fill="none" stroke="${color}" stroke-width="1" opacity="0.3"/>
+                       <path d="M0,-8 L-6,6 L-1,6 L0,8 L1,6 L6,6 Z" fill="${color}"/>
+                       <path d="M0,-6 L0,-10" stroke="${color}" stroke-width="2"/>
+                       <path d="M0,6 L0,8" stroke="${color}" stroke-width="2"/>`;
+                break;
+            case 'military':
+                path = `<path d="M0,-12 L-4,2 L-8,8 L-2,6 L0,12 L2,6 L8,8 L4,2 Z" fill="${color}"/>`;
+                break;
+            case 'cargo':
+                path = `<path d="M0,-12 L-10,8 L-3,8 L0,12 L3,8 L10,8 Z" fill="${color}"/>
+                       <rect x="-2" y="-6" width="4" height="8" fill="${color}"/>`;
+                break;
+            case 'ga':
+                path = `<path d="M0,-10 L-5,6 L-1,6 L0,10 L1,6 L5,6 Z" fill="${color}"/>`;
+                break;
+            case 'ground':
+                path = `<rect x="-6" y="-4" width="12" height="8" fill="${color}" rx="2"/>
+                       <circle cx="-3" cy="2" r="2" fill="#333"/>
+                       <circle cx="3" cy="2" r="2" fill="#333"/>`;
+                break;
+            default:
+                path = `<path d="M0,-12 L-8,8 L-2,8 L0,12 L2,8 L8,8 Z" fill="${color}"/>`;
+        }
+        
+        return `<?xml version="1.0" encoding="UTF-8"?>
+<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+  <g transform="translate(16,16)">
+    ${path}
+  </g>
+</svg>`;
+    }
+
+    updateAircraftData(data) {
+        if (data.aircraft) {
+            this.aircraftData.clear();
+            for (const [icao, aircraft] of Object.entries(data.aircraft)) {
+                this.aircraftData.set(icao, aircraft);
+            }
+        }
+    }
+
+    updateMarkers() {
+        if (!this.map) {
+            return;
+        }
+        
+        // Clear stale aircraft markers
+        const currentICAOs = new Set(this.aircraftData.keys());
+        for (const [icao, marker] of this.aircraftMarkers) {
+            if (!currentICAOs.has(icao)) {
+                this.map.removeLayer(marker);
+                this.aircraftMarkers.delete(icao);
+                
+                // Remove trail if it exists
+                if (this.aircraftTrails.has(icao)) {
+                    const trail = this.aircraftTrails.get(icao);
+                    if (trail.polyline) {
+                        this.map.removeLayer(trail.polyline);
+                    }
+                    this.aircraftTrails.delete(icao);
+                }
+                
+                // Notify if this was the selected aircraft
+                if (this.selectedAircraftCallback && this.selectedAircraftCallback(icao)) {
+                    // Aircraft was selected and disappeared - could notify main app
+                    // For now, the callback will return false automatically since selectedAircraft will be cleared
+                }
+                
+                this.markerRemoveCount++;
+            }
+        }
+        
+        // Update aircraft markers - only for aircraft with valid geographic coordinates
+        for (const [icao, aircraft] of this.aircraftData) {
+            const hasCoords = aircraft.Latitude && aircraft.Longitude && aircraft.Latitude !== 0 && aircraft.Longitude !== 0;
+            const validLat = aircraft.Latitude >= -90 && aircraft.Latitude <= 90;
+            const validLng = aircraft.Longitude >= -180 && aircraft.Longitude <= 180;
+            
+            if (hasCoords && validLat && validLng) {
+                this.updateAircraftMarker(icao, aircraft);
+            }
+        }
+    }
+
+    updateAircraftMarker(icao, aircraft) {
+        const pos = [aircraft.Latitude, aircraft.Longitude];
+        
+        
+        // Check for invalid coordinates - proper geographic bounds
+        const isValidLat = pos[0] >= -90 && pos[0] <= 90;
+        const isValidLng = pos[1] >= -180 && pos[1] <= 180;
+        
+        if (!isValidLat || !isValidLng || isNaN(pos[0]) || isNaN(pos[1])) {
+            console.error(`🚨 Invalid coordinates for ${icao}: [${pos[0]}, ${pos[1]}] (lat must be -90 to +90, lng must be -180 to +180)`);
+            return; // Don't create/update marker with invalid coordinates
+        }
+        
+        if (this.aircraftMarkers.has(icao)) {
+            // Update existing marker - KISS approach
+            const marker = this.aircraftMarkers.get(icao);
+            
+            // Always update position - let Leaflet handle everything
+            const oldPos = marker.getLatLng();
+            marker.setLatLng(pos);
+            
+            // Check if icon needs to be updated (track rotation, aircraft type, or ground status changes)
+            const currentRotation = marker._currentRotation || 0;
+            const currentType = marker._currentType || null;
+            const currentOnGround = marker._currentOnGround || false;
+            
+            const newType = this.getAircraftIconType(aircraft);
+            const rotationChanged = aircraft.Track !== undefined && Math.abs(currentRotation - aircraft.Track) > 5;
+            const typeChanged = currentType !== newType;
+            const groundStatusChanged = currentOnGround !== aircraft.OnGround;
+            
+            if (rotationChanged || typeChanged || groundStatusChanged) {
+                marker.setIcon(this.createAircraftIcon(aircraft));
+                marker._currentRotation = aircraft.Track || 0;
+                marker._currentType = newType;
+                marker._currentOnGround = aircraft.OnGround || false;
+            }
+            
+            // Handle popup exactly like Leaflet expects
+            if (marker.isPopupOpen()) {
+                marker.setPopupContent(this.createPopupContent(aircraft));
+            }
+            
+            this.markerUpdateCount++;
+            
+        } else {
+            // Create new marker
+            const icon = this.createAircraftIcon(aircraft);
+            
+            try {
+                const marker = L.marker(pos, { 
+                    icon: icon
+                }).addTo(this.map);
+                
+                // Store current properties for future update comparisons
+                marker._currentRotation = aircraft.Track || 0;
+                marker._currentType = this.getAircraftIconType(aircraft);
+                marker._currentOnGround = aircraft.OnGround || false;
+                
+                marker.bindPopup(this.createPopupContent(aircraft), {
+                    maxWidth: 450,
+                    className: 'aircraft-popup'
+                });
+                
+                this.aircraftMarkers.set(icao, marker);
+                this.markerCreateCount++;
+                
+                // Force immediate visibility
+                if (marker._icon) {
+                    marker._icon.style.display = 'block';
+                    marker._icon.style.opacity = '1';
+                    marker._icon.style.visibility = 'visible';
+                }
+            } catch (error) {
+                console.error(`Failed to create marker for ${icao}:`, error);
+            }
+        }
+        
+        // Update trails - check both global trails and individual selected aircraft
+        if (this.showTrails || this.isSelectedAircraftTrailEnabled(icao)) {
+            this.updateAircraftTrail(icao, aircraft);
+        }
+    }
+
+    createAircraftIcon(aircraft) {
+        const iconType = this.getAircraftIconType(aircraft);
+        const color = this.getAircraftColor(iconType, aircraft);
+        const size = aircraft.OnGround ? 12 : 16;
+        const rotation = aircraft.Track || 0;
+        
+        // Get SVG template from cache
+        let svgTemplate = this.iconCache.get(iconType) || this.iconCache.get('commercial');
+        
+        if (!svgTemplate) {
+            // Ultimate fallback - create a simple circle
+            svgTemplate = `<svg width="32" height="32" viewBox="0 0 32 32" xmlns="http://www.w3.org/2000/svg">
+                <g transform="translate(16,16)">
+                    <circle cx="0" cy="0" r="8" fill="currentColor"/>
+                </g>
+            </svg>`;
+        }
+        
+        // Apply color and rotation to the SVG
+        let svg = svgTemplate
+            .replace(/currentColor/g, color)
+            .replace(/width="32"/, `width="${size * 2}"`)
+            .replace(/height="32"/, `height="${size * 2}"`);
+        
+        // Add rotation to the transform
+        if (rotation !== 0) {
+            svg = svg.replace(/transform="translate\(16,16\)"/, `transform="translate(16,16) rotate(${rotation})"`);
+        }
+        
+        return L.divIcon({
+            html: svg,
+            iconSize: [size * 2, size * 2],
+            iconAnchor: [size, size],
+            className: 'aircraft-marker'
+        });
+    }
+
+    getAircraftType(aircraft) {
+        // For display purposes, return the actual ADS-B category
+        // This is used in the popup display
+        if (aircraft.OnGround) return 'On Ground';
+        if (aircraft.Category) return aircraft.Category;
+        return 'Unknown';
+    }
+    
+    getAircraftIconType(aircraft) {
+        // For icon selection, we still need basic categories
+        // This determines which SVG shape to use
+        if (aircraft.OnGround) return 'ground';
+        
+        if (aircraft.Category) {
+            const cat = aircraft.Category.toLowerCase();
+            
+            // Map to basic icon types for visual representation
+            if (cat.includes('helicopter') || cat.includes('rotorcraft')) return 'helicopter';
+            if (cat.includes('military') || cat.includes('fighter') || cat.includes('bomber')) return 'military';
+            if (cat.includes('cargo') || cat.includes('heavy') || cat.includes('super')) return 'cargo';
+            if (cat.includes('light') || cat.includes('glider') || cat.includes('ultralight')) return 'ga';
+        }
+        
+        // Default commercial icon for everything else
+        return 'commercial';
+    }
+
+    getAircraftColor(type, aircraft) {
+        // Special colors for specific types
+        if (type === 'military') return '#ff4444';
+        if (type === 'helicopter') return '#ff00ff';
+        if (type === 'ground') return '#888888';
+        if (type === 'ga') return '#ffff00';
+        
+        // For commercial and cargo types, use weight-based colors
+        if (aircraft && aircraft.Category) {
+            const cat = aircraft.Category.toLowerCase();
+            
+            // Check for specific weight ranges in the category string
+            // Light aircraft (< 7000kg) - Sky blue
+            if (cat.includes('light')) {
+                return '#00bfff';
+            }
+            // Medium aircraft (7000-34000kg) - Green  
+            if (cat.includes('medium')) {
+                return '#00ff88';
+            }
+            // High Vortex Large - Red-orange (special wake turbulence category)
+            if (cat.includes('high vortex')) {
+                return '#ff4500';
+            }
+            // Large aircraft (34000-136000kg) - Orange
+            if (cat.includes('large')) {
+                return '#ff8c00';
+            }
+            // Heavy aircraft (> 136000kg) - Red
+            if (cat.includes('heavy') || cat.includes('super')) {
+                return '#ff0000';
+            }
+        }
+        
+        // Default to green for unknown commercial aircraft
+        return '#00ff88';
+    }
+
+
+    updateAircraftTrail(icao, aircraft) {
+        // Use server-provided position history
+        if (!aircraft.position_history || aircraft.position_history.length < 2) {
+            // No trail data available or not enough points
+            if (this.aircraftTrails.has(icao)) {
+                const trail = this.aircraftTrails.get(icao);
+                if (trail.polyline) {
+                    this.map.removeLayer(trail.polyline);
+                }
+                this.aircraftTrails.delete(icao);
+            }
+            return;
+        }
+        
+        // Convert position history to Leaflet format
+        const trailPoints = aircraft.position_history.map(point => [point.lat, point.lon]);
+        
+        // Get or create trail object
+        if (!this.aircraftTrails.has(icao)) {
+            this.aircraftTrails.set(icao, {});
+        }
+        const trail = this.aircraftTrails.get(icao);
+        
+        // Remove old polyline if it exists
+        if (trail.polyline) {
+            this.map.removeLayer(trail.polyline);
+        }
+        
+        // Create gradient effect - newer points are brighter
+        const segments = [];
+        for (let i = 1; i < trailPoints.length; i++) {
+            const opacity = 0.2 + (0.6 * (i / trailPoints.length)); // Fade from 0.2 to 0.8
+            const segment = L.polyline([trailPoints[i-1], trailPoints[i]], {
+                color: '#00d4ff',
+                weight: 2,
+                opacity: opacity
+            });
+            segments.push(segment);
+        }
+        
+        // Create a feature group for all segments
+        trail.polyline = L.featureGroup(segments).addTo(this.map);
+    }
+
+    createPopupContent(aircraft) {
+        const type = this.getAircraftType(aircraft);
+        const country = aircraft.country || 'Unknown';
+        const flag = aircraft.flag || '🏳️';
+        
+        const altitude = aircraft.Altitude || aircraft.BaroAltitude || 0;
+        const altitudeM = altitude ? Math.round(altitude * 0.3048) : 0;
+        const speedKmh = aircraft.GroundSpeed ? Math.round(aircraft.GroundSpeed * 1.852) : 0;
+        const distance = this.calculateDistance(aircraft);
+        const distanceKm = distance ? (distance * 1.852).toFixed(1) : 'N/A';
+        
+        return `
+            <div class="aircraft-popup">
+                <div class="popup-header">
+                    <div class="flight-info">
+                        <span class="icao-flag">${flag}</span>
+                        <span class="flight-id">${aircraft.ICAO24 || 'N/A'}</span>
+                        ${aircraft.Callsign ? `→ <span class="callsign">${aircraft.Callsign}</span>` : ''}
+                    </div>
+                </div>
+                
+                <div class="popup-details">
+                    <div class="detail-row">
+                        <strong>Country:</strong> ${country}
+                    </div>
+                    <div class="detail-row">
+                        <strong>Type:</strong> ${type}
+                    </div>
+                    ${aircraft.TransponderCapability ? `
+                    <div class="detail-row">
+                        <strong>Transponder:</strong> ${aircraft.TransponderCapability}
+                    </div>` : ''}
+                    ${aircraft.SignalQuality ? `
+                    <div class="detail-row">
+                        <strong>Signal Quality:</strong> ${aircraft.SignalQuality}
+                    </div>` : ''}
+                    
+                    <div class="detail-grid">
+                        <div class="detail-item">
+                            <div class="label">Altitude:</div>
+                            <div class="value${!altitude ? ' no-data' : ''}">${altitude ? `${altitude} ft | ${altitudeM} m` : 'N/A'}</div>
+                        </div>
+                        <div class="detail-item">
+                            <div class="label">Squawk:</div>
+                            <div class="value${!aircraft.Squawk ? ' no-data' : ''}">${aircraft.Squawk || 'N/A'}</div>
+                        </div>
+                        <div class="detail-item">
+                            <div class="label">Speed:</div>
+                            <div class="value${!aircraft.GroundSpeed ? ' no-data' : ''}">${aircraft.GroundSpeed !== undefined && aircraft.GroundSpeed !== null ? `${aircraft.GroundSpeed} kt | ${speedKmh} km/h` : 'N/A'}</div>
+                        </div>
+                        <div class="detail-item">
+                            <div class="label">Track:</div>
+                            <div class="value${aircraft.Track === undefined || aircraft.Track === null ? ' no-data' : ''}">${aircraft.Track !== undefined && aircraft.Track !== null ? `${aircraft.Track}°` : 'N/A'}</div>
+                        </div>
+                        <div class="detail-item">
+                            <div class="label">V/Rate:</div>
+                            <div class="value${!aircraft.VerticalRate ? ' no-data' : ''}">${aircraft.VerticalRate ? `${aircraft.VerticalRate} ft/min` : 'N/A'}</div>
+                        </div>
+                        <div class="detail-item">
+                            <div class="label">Distance:</div>
+                            <div class="value${distance ? '' : ' no-data'}">${distanceKm !== 'N/A' ? `${distanceKm} km` : 'N/A'}</div>
+                        </div>
+                    </div>
+                    
+                    <div class="detail-row">
+                        <strong>Position:</strong> ${aircraft.Latitude?.toFixed(4)}°, ${aircraft.Longitude?.toFixed(4)}°
+                    </div>
+                    <div class="detail-row">
+                        <strong>Messages:</strong> ${aircraft.TotalMessages || 0}
+                    </div>
+                    <div class="detail-row">
+                        <strong>Age:</strong> ${aircraft.Age ? aircraft.Age.toFixed(1) : '0'}s
+                    </div>
+                </div>
+            </div>
+        `;
+    }
+
+
+    calculateDistance(aircraft) {
+        if (!aircraft.Latitude || !aircraft.Longitude) return null;
+        
+        // Use closest source as reference point
+        let minDistance = Infinity;
+        for (const [id, srcData] of Object.entries(aircraft.sources || {})) {
+            if (srcData.distance && srcData.distance < minDistance) {
+                minDistance = srcData.distance;
+            }
+        }
+        
+        return minDistance === Infinity ? null : minDistance;
+    }
+
+
+    toggleTrails() {
+        this.showTrails = !this.showTrails;
+        
+        if (!this.showTrails) {
+            // Clear all trails
+            this.aircraftTrails.forEach((trail, icao) => {
+                if (trail.polyline) {
+                    this.map.removeLayer(trail.polyline);
+                }
+            });
+            this.aircraftTrails.clear();
+        }
+        
+        return this.showTrails;
+    }
+
+    showAircraftTrail(icao) {
+        const aircraft = this.aircraftData.get(icao);
+        if (aircraft && aircraft.position_history && aircraft.position_history.length >= 2) {
+            this.updateAircraftTrail(icao, aircraft);
+        }
+    }
+
+    hideAircraftTrail(icao) {
+        if (this.aircraftTrails.has(icao)) {
+            const trail = this.aircraftTrails.get(icao);
+            if (trail.polyline) {
+                this.map.removeLayer(trail.polyline);
+            }
+            this.aircraftTrails.delete(icao);
+        }
+    }
+
+    setSelectedAircraftCallback(callback) {
+        this.selectedAircraftCallback = callback;
+    }
+
+    isSelectedAircraftTrailEnabled(icao) {
+        return this.selectedAircraftCallback && this.selectedAircraftCallback(icao);
+    }
+
+    centerMapOnAircraft(includeSourcesCallback = null) {
+        const validAircraft = Array.from(this.aircraftData.values())
+            .filter(a => a.Latitude && a.Longitude);
+        
+        const allPoints = [];
+        
+        // Add aircraft positions
+        validAircraft.forEach(a => {
+            allPoints.push([a.Latitude, a.Longitude]);
+        });
+        
+        // Add source positions if callback provided
+        if (includeSourcesCallback && typeof includeSourcesCallback === 'function') {
+            const sourcePositions = includeSourcesCallback();
+            allPoints.push(...sourcePositions);
+        }
+        
+        if (allPoints.length === 0) return;
+        
+        if (allPoints.length === 1) {
+            // Center on single point
+            this.map.setView(allPoints[0], 12);
+        } else {
+            // Fit bounds to all points (aircraft + sources)
+            const bounds = L.latLngBounds(allPoints);
+            this.map.fitBounds(bounds.pad(0.1));
+        }
+    }
+
+}

assets/static/js/modules/map-manager.js

@@ -0,0 +1,378 @@
+// Map and visualization management module
+export class MapManager {
+    constructor() {
+        this.map = null;
+        this.coverageMap = null;
+        this.mapOrigin = null;
+        
+        // Source markers and overlays
+        this.sourceMarkers = new Map();
+        this.rangeCircles = new Map();
+        this.showSources = true;
+        this.showRange = false;
+        this.selectedSource = null;
+        this.heatmapLayer = null;
+        
+        // Data references
+        this.sourcesData = new Map();
+        
+        // Map theme
+        this.isDarkMode = false;
+        this.currentTileLayer = null;
+        this.coverageTileLayer = null;
+    }
+
+    async initializeMap() {
+        // Get origin from server
+        let origin = { latitude: 51.4700, longitude: -0.4600 }; // fallback
+        try {
+            const response = await fetch('/api/origin');
+            if (response.ok) {
+                origin = await response.json();
+            }
+        } catch (error) {
+            console.warn('Could not fetch origin, using default:', error);
+        }
+        
+        // Store origin for reset functionality
+        this.mapOrigin = origin;
+        
+        this.map = L.map('map').setView([origin.latitude, origin.longitude], 10);
+        
+        // Light tile layer by default
+        this.currentTileLayer = L.tileLayer('https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}{r}.png', {
+            attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors &copy; <a href="https://carto.com/attributions">CARTO</a>',
+            subdomains: 'abcd',
+            maxZoom: 19
+        }).addTo(this.map);
+        
+        // Add scale control for distance estimation
+        L.control.scale({
+            metric: true,
+            imperial: true,
+            position: 'bottomright'
+        }).addTo(this.map);
+        
+        return this.map;
+    }
+
+    async initializeCoverageMap() {
+        if (!this.coverageMap) {
+            // Get origin from server
+            let origin = { latitude: 51.4700, longitude: -0.4600 }; // fallback
+            try {
+                const response = await fetch('/api/origin');
+                if (response.ok) {
+                    origin = await response.json();
+                }
+            } catch (error) {
+                console.warn('Could not fetch origin for coverage map, using default:', error);
+            }
+            
+            this.coverageMap = L.map('coverage-map').setView([origin.latitude, origin.longitude], 10);
+            
+            this.coverageTileLayer = L.tileLayer('https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}{r}.png', {
+                attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
+            }).addTo(this.coverageMap);
+            
+            // Add scale control for distance estimation
+            L.control.scale({
+                metric: true,
+                imperial: true,
+                position: 'bottomright'
+            }).addTo(this.coverageMap);
+        }
+        
+        return this.coverageMap;
+    }
+
+    updateSourcesData(data) {
+        if (data.sources) {
+            this.sourcesData.clear();
+            data.sources.forEach(source => {
+                this.sourcesData.set(source.id, source);
+            });
+        }
+    }
+
+    updateSourceMarkers() {
+        if (!this.map || !this.showSources) return;
+        
+        // Remove markers for sources that no longer exist
+        const currentSourceIds = new Set(this.sourcesData.keys());
+        for (const [id, marker] of this.sourceMarkers) {
+            if (!currentSourceIds.has(id)) {
+                this.map.removeLayer(marker);
+                this.sourceMarkers.delete(id);
+            }
+        }
+        
+        // Update or create markers for current sources
+        for (const [id, source] of this.sourcesData) {
+            if (source.latitude && source.longitude) {
+                if (this.sourceMarkers.has(id)) {
+                    // Update existing marker
+                    const marker = this.sourceMarkers.get(id);
+                    
+                    // Update marker style if status changed
+                    marker.setStyle({
+                        radius: source.active ? 10 : 6,
+                        fillColor: source.active ? '#00d4ff' : '#666666',
+                        fillOpacity: 0.8
+                    });
+                    
+                    // Update popup content if it's open
+                    if (marker.isPopupOpen()) {
+                        marker.setPopupContent(this.createSourcePopupContent(source));
+                    }
+                } else {
+                    // Create new marker
+                    const marker = L.circleMarker([source.latitude, source.longitude], {
+                        radius: source.active ? 10 : 6,
+                        fillColor: source.active ? '#00d4ff' : '#666666',
+                        color: '#ffffff',
+                        weight: 2,
+                        fillOpacity: 0.8,
+                        className: 'source-marker'
+                    }).addTo(this.map);
+                    
+                    marker.bindPopup(this.createSourcePopupContent(source), {
+                        maxWidth: 300
+                    });
+                    
+                    this.sourceMarkers.set(id, marker);
+                }
+            }
+        }
+        
+        this.updateSourcesLegend();
+    }
+
+    updateRangeCircles() {
+        if (!this.map || !this.showRange) return;
+        
+        // Clear existing circles
+        this.rangeCircles.forEach(circle => this.map.removeLayer(circle));
+        this.rangeCircles.clear();
+        
+        // Add range circles for active sources
+        for (const [id, source] of this.sourcesData) {
+            if (source.active && source.latitude && source.longitude) {
+                // Add multiple range circles (50km, 100km, 200km)
+                const ranges = [50000, 100000, 200000];
+                ranges.forEach((range, index) => {
+                    const circle = L.circle([source.latitude, source.longitude], {
+                        radius: range,
+                        fillColor: 'transparent',
+                        color: '#00d4ff',
+                        weight: 2,
+                        opacity: 0.7 - (index * 0.15),
+                        dashArray: '8,4'
+                    }).addTo(this.map);
+                    
+                    this.rangeCircles.set(`${id}_${range}`, circle);
+                });
+            }
+        }
+    }
+
+    createSourcePopupContent(source, aircraftData) {
+        const aircraftCount = aircraftData ? Array.from(aircraftData.values())
+            .filter(aircraft => aircraft.sources && aircraft.sources[source.id]).length : 0;
+        
+        return `
+            <div class="source-popup">
+                <h3>${source.name}</h3>
+                <p><strong>ID:</strong> ${source.id}</p>
+                <p><strong>Location:</strong> ${source.latitude.toFixed(4)}°, ${source.longitude.toFixed(4)}°</p>
+                <p><strong>Status:</strong> ${source.active ? 'Active' : 'Inactive'}</p>
+                <p><strong>Aircraft:</strong> ${aircraftCount}</p>
+                <p><strong>Messages:</strong> ${source.messages || 0}</p>
+                <p><strong>Last Seen:</strong> ${source.last_seen ? new Date(source.last_seen).toLocaleString() : 'N/A'}</p>
+            </div>
+        `;
+    }
+
+    updateSourcesLegend() {
+        const legend = document.getElementById('sources-legend');
+        if (!legend) return;
+        
+        legend.innerHTML = '';
+        
+        for (const [id, source] of this.sourcesData) {
+            const item = document.createElement('div');
+            item.className = 'legend-item';
+            item.innerHTML = `
+                <span class="legend-icon" style="background: ${source.active ? '#00d4ff' : '#666666'}"></span>
+                <span title="${source.host}:${source.port}">${source.name}</span>
+            `;
+            legend.appendChild(item);
+        }
+    }
+
+    resetMap() {
+        if (this.mapOrigin && this.map) {
+            this.map.setView([this.mapOrigin.latitude, this.mapOrigin.longitude], 10);
+        }
+    }
+
+    toggleRangeCircles() {
+        this.showRange = !this.showRange;
+        
+        if (this.showRange) {
+            this.updateRangeCircles();
+        } else {
+            this.rangeCircles.forEach(circle => this.map.removeLayer(circle));
+            this.rangeCircles.clear();
+        }
+        
+        return this.showRange;
+    }
+
+    toggleSources() {
+        this.showSources = !this.showSources;
+        
+        if (this.showSources) {
+            this.updateSourceMarkers();
+        } else {
+            this.sourceMarkers.forEach(marker => this.map.removeLayer(marker));
+            this.sourceMarkers.clear();
+        }
+        
+        return this.showSources;
+    }
+
+    toggleDarkMode() {
+        this.isDarkMode = !this.isDarkMode;
+        
+        const lightUrl = 'https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}{r}.png';
+        const darkUrl = 'https://{s}.basemaps.cartocdn.com/dark_all/{z}/{x}/{y}{r}.png';
+        const tileUrl = this.isDarkMode ? darkUrl : lightUrl;
+        
+        const tileOptions = {
+            attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors &copy; <a href="https://carto.com/attributions">CARTO</a>',
+            subdomains: 'abcd',
+            maxZoom: 19
+        };
+        
+        // Update main map
+        if (this.map && this.currentTileLayer) {
+            this.map.removeLayer(this.currentTileLayer);
+            this.currentTileLayer = L.tileLayer(tileUrl, tileOptions).addTo(this.map);
+        }
+        
+        // Update coverage map
+        if (this.coverageMap && this.coverageTileLayer) {
+            this.coverageMap.removeLayer(this.coverageTileLayer);
+            this.coverageTileLayer = L.tileLayer(tileUrl, {
+                attribution: '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors'
+            }).addTo(this.coverageMap);
+        }
+        
+        return this.isDarkMode;
+    }
+
+    // Coverage map methods
+    updateCoverageControls() {
+        const select = document.getElementById('coverage-source');
+        if (!select) return;
+        
+        select.innerHTML = '<option value="">Select Source</option>';
+        
+        for (const [id, source] of this.sourcesData) {
+            const option = document.createElement('option');
+            option.value = id;
+            option.textContent = source.name;
+            select.appendChild(option);
+        }
+    }
+
+    async updateCoverageDisplay() {
+        if (!this.selectedSource || !this.coverageMap) return;
+        
+        try {
+            const response = await fetch(`/api/coverage/${this.selectedSource}`);
+            const data = await response.json();
+            
+            // Clear existing coverage markers
+            this.coverageMap.eachLayer(layer => {
+                if (layer instanceof L.CircleMarker) {
+                    this.coverageMap.removeLayer(layer);
+                }
+            });
+            
+            // Add coverage points
+            data.points.forEach(point => {
+                const intensity = Math.max(0, (point.signal + 50) / 50); // Normalize signal strength
+                L.circleMarker([point.lat, point.lon], {
+                    radius: 3,
+                    fillColor: this.getSignalColor(point.signal),
+                    color: 'white',
+                    weight: 1,
+                    fillOpacity: intensity
+                }).addTo(this.coverageMap);
+            });
+            
+        } catch (error) {
+            console.error('Failed to load coverage data:', error);
+        }
+    }
+
+    async toggleHeatmap() {
+        if (!this.selectedSource) {
+            alert('Please select a source first');
+            return false;
+        }
+        
+        if (this.heatmapLayer) {
+            this.coverageMap.removeLayer(this.heatmapLayer);
+            this.heatmapLayer = null;
+            return false;
+        } else {
+            try {
+                const response = await fetch(`/api/heatmap/${this.selectedSource}`);
+                const data = await response.json();
+                
+                // Create heatmap layer (simplified)
+                this.createHeatmapOverlay(data);
+                return true;
+                
+            } catch (error) {
+                console.error('Failed to load heatmap data:', error);
+                return false;
+            }
+        }
+    }
+
+    getSignalColor(signal) {
+        if (signal > -10) return '#00ff88';
+        if (signal > -20) return '#ffff00';
+        if (signal > -30) return '#ff8c00';
+        return '#ff4444';
+    }
+
+    createHeatmapOverlay(data) {
+        // 🚧 Under Construction: Heatmap visualization not yet implemented
+        // Planned: Use Leaflet.heat library for proper heatmap rendering
+        console.log('Heatmap overlay requested but not yet implemented');
+        
+        // Show user-visible notice
+        if (window.uiManager) {
+            window.uiManager.showError('Heatmap visualization is under construction 🚧');
+        }
+    }
+
+    setSelectedSource(sourceId) {
+        this.selectedSource = sourceId;
+    }
+
+    getSourcePositions() {
+        const positions = [];
+        for (const [id, source] of this.sourcesData) {
+            if (source.latitude && source.longitude) {
+                positions.push([source.latitude, source.longitude]);
+            }
+        }
+        return positions;
+    }
+}

assets/static/js/modules/ui-manager.js

@@ -0,0 +1,337 @@
+// UI and table management module
+export class UIManager {
+    constructor() {
+        this.aircraftData = new Map();
+        this.sourcesData = new Map();
+        this.stats = {};
+        this.currentView = 'map-view';
+        this.lastUpdateTime = new Date();
+    }
+
+    initializeViews() {
+        const viewButtons = document.querySelectorAll('.view-btn');
+        const views = document.querySelectorAll('.view');
+
+        viewButtons.forEach(btn => {
+            btn.addEventListener('click', () => {
+                const viewId = btn.id.replace('-btn', '');
+                this.switchView(viewId);
+            });
+        });
+    }
+
+    switchView(viewId) {
+        // Update buttons
+        document.querySelectorAll('.view-btn').forEach(btn => btn.classList.remove('active'));
+        const activeBtn = document.getElementById(`${viewId}-btn`);
+        if (activeBtn) {
+            activeBtn.classList.add('active');
+        }
+        
+        // Update views (viewId already includes the full view ID like "map-view")
+        document.querySelectorAll('.view').forEach(view => view.classList.remove('active'));
+        const activeView = document.getElementById(viewId);
+        if (activeView) {
+            activeView.classList.add('active');
+        } else {
+            console.warn(`View element not found: ${viewId}`);
+            return;
+        }
+        
+        this.currentView = viewId;
+        return viewId;
+    }
+
+    updateData(data) {
+        // Update aircraft data
+        if (data.aircraft) {
+            this.aircraftData.clear();
+            for (const [icao, aircraft] of Object.entries(data.aircraft)) {
+                this.aircraftData.set(icao, aircraft);
+            }
+        }
+        
+        // Update sources data
+        if (data.sources) {
+            this.sourcesData.clear();
+            data.sources.forEach(source => {
+                this.sourcesData.set(source.id, source);
+            });
+        }
+        
+        // Update statistics
+        if (data.stats) {
+            this.stats = data.stats;
+        }
+        
+        this.lastUpdateTime = new Date();
+    }
+
+    updateAircraftTable() {
+        // Note: This table shows ALL aircraft we're tracking, including those without 
+        // position data. Aircraft without positions will show "No position" in the 
+        // location column but still provide useful info like callsign, altitude, etc.
+        const tbody = document.getElementById('aircraft-tbody');
+        if (!tbody) return;
+        
+        tbody.innerHTML = '';
+        
+        let filteredData = Array.from(this.aircraftData.values());
+        
+        // Apply filters
+        const searchTerm = document.getElementById('search-input')?.value.toLowerCase() || '';
+        const sourceFilter = document.getElementById('source-filter')?.value || '';
+        
+        if (searchTerm) {
+            filteredData = filteredData.filter(aircraft =>
+                (aircraft.Callsign && aircraft.Callsign.toLowerCase().includes(searchTerm)) ||
+                (aircraft.ICAO24 && aircraft.ICAO24.toLowerCase().includes(searchTerm)) ||
+                (aircraft.Squawk && aircraft.Squawk.includes(searchTerm))
+            );
+        }
+        
+        if (sourceFilter) {
+            filteredData = filteredData.filter(aircraft =>
+                aircraft.sources && aircraft.sources[sourceFilter]
+            );
+        }
+        
+        // Sort data
+        const sortBy = document.getElementById('sort-select')?.value || 'distance';
+        this.sortAircraft(filteredData, sortBy);
+        
+        // Populate table
+        filteredData.forEach(aircraft => {
+            const row = this.createTableRow(aircraft);
+            tbody.appendChild(row);
+        });
+        
+        // Update source filter options
+        this.updateSourceFilter();
+    }
+
+    createTableRow(aircraft) {
+        const type = this.getAircraftType(aircraft);
+        const icao = aircraft.ICAO24 || 'N/A';
+        const altitude = aircraft.Altitude || aircraft.BaroAltitude || 0;
+        const distance = this.calculateDistance(aircraft);
+        const sources = aircraft.sources ? Object.keys(aircraft.sources).length : 0;
+        const bestSignal = this.getBestSignalFromSources(aircraft.sources);
+        
+        const row = document.createElement('tr');
+        row.innerHTML = `
+            <td><span class="type-badge ${type}">${icao}</span></td>
+            <td>${aircraft.Callsign || '-'}</td>
+            <td>${aircraft.Squawk || '-'}</td>
+            <td>${altitude ? `${altitude} ft` : '-'}</td>
+            <td>${aircraft.GroundSpeed || '-'} kt</td>
+            <td>${distance ? distance.toFixed(1) : '-'} km</td>
+            <td>${aircraft.Track || '-'}°</td>
+            <td>${sources}</td>
+            <td><span class="${this.getSignalClass(bestSignal)}">${bestSignal ? bestSignal.toFixed(1) : '-'}</span></td>
+            <td>${aircraft.Age ? aircraft.Age.toFixed(0) : '0'}s</td>
+        `;
+        
+        row.addEventListener('click', () => {
+            if (aircraft.Latitude && aircraft.Longitude) {
+                // Trigger event to switch to map and focus on aircraft
+                const event = new CustomEvent('aircraftSelected', {
+                    detail: { icao, aircraft }
+                });
+                document.dispatchEvent(event);
+            }
+        });
+        
+        return row;
+    }
+
+    getAircraftType(aircraft) {
+        if (aircraft.OnGround) return 'ground';
+        if (aircraft.Category) {
+            const cat = aircraft.Category.toLowerCase();
+            if (cat.includes('military')) return 'military';
+            if (cat.includes('cargo') || cat.includes('heavy')) return 'cargo';
+            if (cat.includes('light') || cat.includes('glider')) return 'ga';
+        }
+        if (aircraft.Callsign) {
+            const cs = aircraft.Callsign.toLowerCase();
+            if (cs.includes('mil') || cs.includes('army') || cs.includes('navy')) return 'military';
+            if (cs.includes('cargo') || cs.includes('fedex') || cs.includes('ups')) return 'cargo';
+        }
+        return 'commercial';
+    }
+
+    getBestSignalFromSources(sources) {
+        if (!sources) return null;
+        let bestSignal = -999;
+        for (const [id, data] of Object.entries(sources)) {
+            if (data.signal_level > bestSignal) {
+                bestSignal = data.signal_level;
+            }
+        }
+        return bestSignal === -999 ? null : bestSignal;
+    }
+
+    getSignalClass(signal) {
+        if (!signal) return '';
+        if (signal > -10) return 'signal-strong';
+        if (signal > -20) return 'signal-good';
+        if (signal > -30) return 'signal-weak';
+        return 'signal-poor';
+    }
+
+    updateSourceFilter() {
+        const select = document.getElementById('source-filter');
+        if (!select) return;
+        
+        const currentValue = select.value;
+        
+        // Clear options except "All Sources"
+        select.innerHTML = '<option value="">All Sources</option>';
+        
+        // Add source options
+        for (const [id, source] of this.sourcesData) {
+            const option = document.createElement('option');
+            option.value = id;
+            option.textContent = source.name;
+            if (id === currentValue) option.selected = true;
+            select.appendChild(option);
+        }
+    }
+
+    sortAircraft(aircraft, sortBy) {
+        aircraft.sort((a, b) => {
+            switch (sortBy) {
+                case 'distance':
+                    return (this.calculateDistance(a) || Infinity) - (this.calculateDistance(b) || Infinity);
+                case 'altitude':
+                    return (b.Altitude || b.BaroAltitude || 0) - (a.Altitude || a.BaroAltitude || 0);
+                case 'speed':
+                    return (b.GroundSpeed || 0) - (a.GroundSpeed || 0);
+                case 'flight':
+                    return (a.Callsign || a.ICAO24 || '').localeCompare(b.Callsign || b.ICAO24 || '');
+                case 'icao':
+                    return (a.ICAO24 || '').localeCompare(b.ICAO24 || '');
+                case 'squawk':
+                    return (a.Squawk || '').localeCompare(b.Squawk || '');
+                case 'signal':
+                    return (this.getBestSignalFromSources(b.sources) || -999) - (this.getBestSignalFromSources(a.sources) || -999);
+                case 'age':
+                    return (a.Age || 0) - (b.Age || 0);
+                default:
+                    return 0;
+            }
+        });
+    }
+
+    calculateDistance(aircraft) {
+        if (!aircraft.Latitude || !aircraft.Longitude) return null;
+        
+        // Use closest source as reference point
+        let minDistance = Infinity;
+        for (const [id, srcData] of Object.entries(aircraft.sources || {})) {
+            if (srcData.distance && srcData.distance < minDistance) {
+                minDistance = srcData.distance;
+            }
+        }
+        
+        return minDistance === Infinity ? null : minDistance;
+    }
+
+    updateStatistics() {
+        const totalAircraftEl = document.getElementById('total-aircraft');
+        const activeSourcesEl = document.getElementById('active-sources');
+        const maxRangeEl = document.getElementById('max-range');
+        const messagesSecEl = document.getElementById('messages-sec');
+        
+        if (totalAircraftEl) totalAircraftEl.textContent = this.aircraftData.size;
+        if (activeSourcesEl) {
+            activeSourcesEl.textContent = Array.from(this.sourcesData.values()).filter(s => s.active).length;
+        }
+        
+        // Calculate max range
+        let maxDistance = 0;
+        for (const aircraft of this.aircraftData.values()) {
+            const distance = this.calculateDistance(aircraft);
+            if (distance && distance > maxDistance) {
+                maxDistance = distance;
+            }
+        }
+        if (maxRangeEl) maxRangeEl.textContent = `${maxDistance.toFixed(1)} km`;
+        
+        // Update message rate
+        const totalMessages = this.stats.total_messages || 0;
+        if (messagesSecEl) messagesSecEl.textContent = Math.round(totalMessages / 60);
+    }
+
+    updateHeaderInfo() {
+        const aircraftCountEl = document.getElementById('aircraft-count');
+        const sourcesCountEl = document.getElementById('sources-count');
+        
+        if (aircraftCountEl) aircraftCountEl.textContent = `${this.aircraftData.size} aircraft`;
+        if (sourcesCountEl) sourcesCountEl.textContent = `${this.sourcesData.size} sources`;
+        
+        this.updateClocks();
+    }
+
+    updateConnectionStatus(status) {
+        const statusEl = document.getElementById('connection-status');
+        if (statusEl) {
+            statusEl.className = `connection-status ${status}`;
+            statusEl.textContent = status === 'connected' ? 'Connected' : 'Disconnected';
+        }
+    }
+
+    initializeEventListeners() {
+        const searchInput = document.getElementById('search-input');
+        const sortSelect = document.getElementById('sort-select');
+        const sourceFilter = document.getElementById('source-filter');
+        
+        if (searchInput) searchInput.addEventListener('input', () => this.updateAircraftTable());
+        if (sortSelect) sortSelect.addEventListener('change', () => this.updateAircraftTable());
+        if (sourceFilter) sourceFilter.addEventListener('change', () => this.updateAircraftTable());
+    }
+
+    updateClocks() {
+        const now = new Date();
+        const utcNow = new Date(now.getTime() + (now.getTimezoneOffset() * 60000));
+        
+        this.updateClock('utc', utcNow);
+        this.updateClock('update', this.lastUpdateTime);
+    }
+
+    updateClock(prefix, time) {
+        const hours = time.getUTCHours();
+        const minutes = time.getUTCMinutes();
+        
+        const hourAngle = (hours % 12) * 30 + minutes * 0.5;
+        const minuteAngle = minutes * 6;
+        
+        const hourHand = document.getElementById(`${prefix}-hour`);
+        const minuteHand = document.getElementById(`${prefix}-minute`);
+        
+        if (hourHand) hourHand.style.transform = `rotate(${hourAngle}deg)`;
+        if (minuteHand) minuteHand.style.transform = `rotate(${minuteAngle}deg)`;
+    }
+
+    showError(message) {
+        console.error(message);
+        
+        // Simple toast notification implementation
+        const toast = document.createElement('div');
+        toast.className = 'toast-notification error';
+        toast.textContent = message;
+        
+        // Add to page
+        document.body.appendChild(toast);
+        
+        // Show toast with animation
+        setTimeout(() => toast.classList.add('show'), 100);
+        
+        // Auto-remove after 5 seconds
+        setTimeout(() => {
+            toast.classList.remove('show');
+            setTimeout(() => document.body.removeChild(toast), 300);
+        }, 5000);
+    }
+}

assets/static/js/modules/websocket.js

@@ -0,0 +1,54 @@
+// WebSocket communication module
+export class WebSocketManager {
+    constructor(onMessage, onStatusChange) {
+        this.websocket = null;
+        this.onMessage = onMessage;
+        this.onStatusChange = onStatusChange;
+    }
+
+    async connect() {
+        const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
+        const wsUrl = `${protocol}//${window.location.host}/ws`;
+        
+        try {
+            this.websocket = new WebSocket(wsUrl);
+            
+            this.websocket.onopen = () => {
+                this.onStatusChange('connected');
+            };
+            
+            this.websocket.onclose = () => {
+                this.onStatusChange('disconnected');
+                // Reconnect after 5 seconds
+                setTimeout(() => this.connect(), 5000);
+            };
+            
+            this.websocket.onerror = (error) => {
+                console.error('WebSocket error:', error);
+                this.onStatusChange('disconnected');
+            };
+            
+            this.websocket.onmessage = (event) => {
+                try {
+                    const message = JSON.parse(event.data);
+                    
+                    
+                    this.onMessage(message);
+                } catch (error) {
+                    console.error('Failed to parse WebSocket message:', error);
+                }
+            };
+            
+        } catch (error) {
+            console.error('WebSocket connection failed:', error);
+            this.onStatusChange('disconnected');
+        }
+    }
+
+    disconnect() {
+        if (this.websocket) {
+            this.websocket.close();
+            this.websocket = null;
+        }
+    }
+}

cmd/beast-dump/main.go

@@ -0,0 +1,442 @@
+// Package main provides a utility for parsing and displaying Beast format ADS-B data.
+//
+// beast-dump can read from TCP sockets (dump1090 streams) or files containing
+// Beast binary data, decode Mode S/ADS-B messages, and display the results
+// in human-readable format on the console.
+//
+// Usage:
+//
+//	beast-dump -tcp host:port          # Read from TCP socket
+//	beast-dump -file path/to/file      # Read from file
+//	beast-dump -verbose               # Show detailed message parsing
+//
+// Examples:
+//
+//	beast-dump -tcp svovel:30005      # Connect to dump1090 Beast stream
+//	beast-dump -file beast.test       # Parse Beast data from file
+//	beast-dump -tcp localhost:30005 -verbose  # Verbose TCP parsing
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"os"
+	"time"
+
+	"skyview/internal/beast"
+	"skyview/internal/modes"
+)
+
+// Config holds command-line configuration
+type Config struct {
+	TCPAddress string // TCP address for Beast stream (e.g., "localhost:30005")
+	FilePath   string // File path for Beast data
+	Verbose    bool   // Enable verbose output
+	Count      int    // Maximum messages to process (0 = unlimited)
+}
+
+// BeastDumper handles Beast data parsing and console output
+type BeastDumper struct {
+	config  *Config
+	parser  *beast.Parser
+	decoder *modes.Decoder
+	stats   struct {
+		totalMessages   int64
+		validMessages   int64
+		aircraftSeen    map[uint32]bool
+		startTime       time.Time
+		lastMessageTime time.Time
+	}
+}
+
+func main() {
+	config := parseFlags()
+
+	if config.TCPAddress == "" && config.FilePath == "" {
+		fmt.Fprintf(os.Stderr, "Error: Must specify either -tcp or -file\n")
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	if config.TCPAddress != "" && config.FilePath != "" {
+		fmt.Fprintf(os.Stderr, "Error: Cannot specify both -tcp and -file\n")
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	dumper := NewBeastDumper(config)
+
+	if err := dumper.Run(); err != nil {
+		log.Fatalf("Error: %v", err)
+	}
+}
+
+// parseFlags parses command-line flags and returns configuration
+func parseFlags() *Config {
+	config := &Config{}
+
+	flag.StringVar(&config.TCPAddress, "tcp", "", "TCP address for Beast stream (e.g., localhost:30005)")
+	flag.StringVar(&config.FilePath, "file", "", "File path for Beast data")
+	flag.BoolVar(&config.Verbose, "verbose", false, "Enable verbose output")
+	flag.IntVar(&config.Count, "count", 0, "Maximum messages to process (0 = unlimited)")
+
+	flag.Usage = func() {
+		fmt.Fprintf(os.Stderr, "Usage: %s [options]\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "\nBeast format ADS-B data parser and console dumper\n\n")
+		fmt.Fprintf(os.Stderr, "Options:\n")
+		flag.PrintDefaults()
+		fmt.Fprintf(os.Stderr, "\nExamples:\n")
+		fmt.Fprintf(os.Stderr, "  %s -tcp svovel:30005\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "  %s -file beast.test\n", os.Args[0])
+		fmt.Fprintf(os.Stderr, "  %s -tcp localhost:30005 -verbose -count 100\n", os.Args[0])
+	}
+
+	flag.Parse()
+	return config
+}
+
+// NewBeastDumper creates a new Beast data dumper
+func NewBeastDumper(config *Config) *BeastDumper {
+	return &BeastDumper{
+		config:  config,
+		decoder: modes.NewDecoder(0.0, 0.0), // beast-dump doesn't have reference position, use default
+		stats: struct {
+			totalMessages   int64
+			validMessages   int64
+			aircraftSeen    map[uint32]bool
+			startTime       time.Time
+			lastMessageTime time.Time
+		}{
+			aircraftSeen: make(map[uint32]bool),
+			startTime:    time.Now(),
+		},
+	}
+}
+
+// Run starts the Beast data processing
+func (d *BeastDumper) Run() error {
+	fmt.Printf("Beast Data Dumper\n")
+	fmt.Printf("=================\n\n")
+
+	var reader io.Reader
+	var closer io.Closer
+
+	if d.config.TCPAddress != "" {
+		conn, err := d.connectTCP()
+		if err != nil {
+			return fmt.Errorf("TCP connection failed: %w", err)
+		}
+		reader = conn
+		closer = conn
+		fmt.Printf("Connected to: %s\n", d.config.TCPAddress)
+	} else {
+		file, err := d.openFile()
+		if err != nil {
+			return fmt.Errorf("file open failed: %w", err)
+		}
+		reader = file
+		closer = file
+		fmt.Printf("Reading file: %s\n", d.config.FilePath)
+	}
+
+	defer closer.Close()
+
+	// Create Beast parser
+	d.parser = beast.NewParser(reader, "beast-dump")
+
+	fmt.Printf("Verbose mode: %t\n", d.config.Verbose)
+	if d.config.Count > 0 {
+		fmt.Printf("Message limit: %d\n", d.config.Count)
+	}
+	fmt.Printf("\nStarting Beast data parsing...\n")
+	fmt.Printf("%-8s %-6s %-12s %-8s %-10s %-6s %s\n",
+		"Time", "ICAO", "Type", "Signal", "Data", "Len", "Decoded")
+	fmt.Printf("%s\n",
+		"------------------------------------------------------------------------")
+
+	return d.parseMessages()
+}
+
+// connectTCP establishes TCP connection to Beast stream
+func (d *BeastDumper) connectTCP() (net.Conn, error) {
+	fmt.Printf("Connecting to %s...\n", d.config.TCPAddress)
+
+	conn, err := net.DialTimeout("tcp", d.config.TCPAddress, 10*time.Second)
+	if err != nil {
+		return nil, err
+	}
+
+	return conn, nil
+}
+
+// openFile opens Beast data file
+func (d *BeastDumper) openFile() (*os.File, error) {
+	file, err := os.Open(d.config.FilePath)
+	if err != nil {
+		return nil, err
+	}
+
+	// Check file size
+	stat, err := file.Stat()
+	if err != nil {
+		file.Close()
+		return nil, err
+	}
+
+	fmt.Printf("File size: %d bytes\n", stat.Size())
+	return file, nil
+}
+
+// parseMessages processes Beast messages and outputs decoded data
+func (d *BeastDumper) parseMessages() error {
+	for {
+		// Check message count limit
+		if d.config.Count > 0 && d.stats.totalMessages >= int64(d.config.Count) {
+			fmt.Printf("\nReached message limit of %d\n", d.config.Count)
+			break
+		}
+
+		// Parse Beast message
+		msg, err := d.parser.ReadMessage()
+		if err != nil {
+			if err == io.EOF {
+				fmt.Printf("\nEnd of data reached\n")
+				break
+			}
+			if d.config.Verbose {
+				fmt.Printf("Parse error: %v\n", err)
+			}
+			continue
+		}
+
+		d.stats.totalMessages++
+		d.stats.lastMessageTime = time.Now()
+
+		// Display Beast message info
+		d.displayMessage(msg)
+
+		// Decode Mode S data if available
+		if msg.Type == beast.BeastModeS || msg.Type == beast.BeastModeSLong {
+			d.decodeAndDisplay(msg)
+		}
+
+		d.stats.validMessages++
+	}
+
+	d.displayStatistics()
+	return nil
+}
+
+// displayMessage shows basic Beast message information
+func (d *BeastDumper) displayMessage(msg *beast.Message) {
+	timestamp := msg.ReceivedAt.Format("15:04:05")
+
+	// Extract ICAO if available
+	icao := "------"
+	if msg.Type == beast.BeastModeS || msg.Type == beast.BeastModeSLong {
+		if icaoAddr, err := msg.GetICAO24(); err == nil {
+			icao = fmt.Sprintf("%06X", icaoAddr)
+			d.stats.aircraftSeen[icaoAddr] = true
+		}
+	}
+
+	// Beast message type
+	typeStr := d.formatMessageType(msg.Type)
+
+	// Signal strength
+	signal := msg.GetSignalStrength()
+	signalStr := fmt.Sprintf("%6.1f", signal)
+
+	// Data preview
+	dataStr := d.formatDataPreview(msg.Data)
+
+	fmt.Printf("%-8s %-6s %-12s %-8s %-10s %-6d ",
+		timestamp, icao, typeStr, signalStr, dataStr, len(msg.Data))
+}
+
+// decodeAndDisplay attempts to decode Mode S message and display results
+func (d *BeastDumper) decodeAndDisplay(msg *beast.Message) {
+	aircraft, err := d.decoder.Decode(msg.Data)
+	if err != nil {
+		if d.config.Verbose {
+			fmt.Printf("Decode error: %v\n", err)
+		} else {
+			fmt.Printf("(decode failed)\n")
+		}
+		return
+	}
+
+	// Display decoded information
+	info := d.formatAircraftInfo(aircraft)
+	fmt.Printf("%s\n", info)
+
+	// Verbose details
+	if d.config.Verbose {
+		d.displayVerboseInfo(aircraft, msg)
+	}
+}
+
+// formatMessageType converts Beast message type to string
+func (d *BeastDumper) formatMessageType(msgType uint8) string {
+	switch msgType {
+	case beast.BeastModeAC:
+		return "Mode A/C"
+	case beast.BeastModeS:
+		return "Mode S"
+	case beast.BeastModeSLong:
+		return "Mode S Long"
+	case beast.BeastStatusMsg:
+		return "Status"
+	default:
+		return fmt.Sprintf("Type %02X", msgType)
+	}
+}
+
+// formatDataPreview creates a hex preview of message data
+func (d *BeastDumper) formatDataPreview(data []byte) string {
+	if len(data) == 0 {
+		return ""
+	}
+
+	preview := ""
+	for i, b := range data {
+		if i >= 4 { // Show first 4 bytes
+			break
+		}
+		preview += fmt.Sprintf("%02X", b)
+	}
+
+	if len(data) > 4 {
+		preview += "..."
+	}
+
+	return preview
+}
+
+// formatAircraftInfo creates a summary of decoded aircraft information
+func (d *BeastDumper) formatAircraftInfo(aircraft *modes.Aircraft) string {
+	parts := []string{}
+
+	// Callsign
+	if aircraft.Callsign != "" {
+		parts = append(parts, fmt.Sprintf("CS:%s", aircraft.Callsign))
+	}
+
+	// Position
+	if aircraft.Latitude != 0 || aircraft.Longitude != 0 {
+		parts = append(parts, fmt.Sprintf("POS:%.4f,%.4f", aircraft.Latitude, aircraft.Longitude))
+	}
+
+	// Altitude
+	if aircraft.Altitude != 0 {
+		parts = append(parts, fmt.Sprintf("ALT:%dft", aircraft.Altitude))
+	}
+
+	// Speed and track
+	if aircraft.GroundSpeed != 0 {
+		parts = append(parts, fmt.Sprintf("SPD:%dkt", aircraft.GroundSpeed))
+	}
+	if aircraft.Track != 0 {
+		parts = append(parts, fmt.Sprintf("HDG:%d°", aircraft.Track))
+	}
+
+	// Vertical rate
+	if aircraft.VerticalRate != 0 {
+		parts = append(parts, fmt.Sprintf("VS:%d", aircraft.VerticalRate))
+	}
+
+	// Squawk
+	if aircraft.Squawk != "" {
+		parts = append(parts, fmt.Sprintf("SQ:%s", aircraft.Squawk))
+	}
+
+	// Emergency
+	if aircraft.Emergency != "" && aircraft.Emergency != "None" {
+		parts = append(parts, fmt.Sprintf("EMG:%s", aircraft.Emergency))
+	}
+
+	if len(parts) == 0 {
+		return "(no data decoded)"
+	}
+
+	info := ""
+	for i, part := range parts {
+		if i > 0 {
+			info += " "
+		}
+		info += part
+	}
+
+	return info
+}
+
+// displayVerboseInfo shows detailed aircraft information
+func (d *BeastDumper) displayVerboseInfo(aircraft *modes.Aircraft, msg *beast.Message) {
+	fmt.Printf("    Message Details:\n")
+	fmt.Printf("      Raw Data: %s\n", d.formatHexData(msg.Data))
+	fmt.Printf("      Timestamp: %s\n", msg.ReceivedAt.Format("15:04:05.000"))
+	fmt.Printf("      Signal: %.2f dBFS\n", msg.GetSignalStrength())
+
+	fmt.Printf("    Aircraft Data:\n")
+	if aircraft.Callsign != "" {
+		fmt.Printf("      Callsign: %s\n", aircraft.Callsign)
+	}
+	if aircraft.Latitude != 0 || aircraft.Longitude != 0 {
+		fmt.Printf("      Position: %.6f, %.6f\n", aircraft.Latitude, aircraft.Longitude)
+	}
+	if aircraft.Altitude != 0 {
+		fmt.Printf("      Altitude: %d ft\n", aircraft.Altitude)
+	}
+	if aircraft.GroundSpeed != 0 || aircraft.Track != 0 {
+		fmt.Printf("      Speed/Track: %d kt @ %d°\n", aircraft.GroundSpeed, aircraft.Track)
+	}
+	if aircraft.VerticalRate != 0 {
+		fmt.Printf("      Vertical Rate: %d ft/min\n", aircraft.VerticalRate)
+	}
+	if aircraft.Squawk != "" {
+		fmt.Printf("      Squawk: %s\n", aircraft.Squawk)
+	}
+	if aircraft.Category != "" {
+		fmt.Printf("      Category: %s\n", aircraft.Category)
+	}
+	fmt.Printf("\n")
+}
+
+// formatHexData creates a formatted hex dump of data
+func (d *BeastDumper) formatHexData(data []byte) string {
+	result := ""
+	for i, b := range data {
+		if i > 0 {
+			result += " "
+		}
+		result += fmt.Sprintf("%02X", b)
+	}
+	return result
+}
+
+// displayStatistics shows final parsing statistics
+func (d *BeastDumper) displayStatistics() {
+	duration := time.Since(d.stats.startTime)
+
+	fmt.Printf("\nStatistics:\n")
+	fmt.Printf("===========\n")
+	fmt.Printf("Total messages: %d\n", d.stats.totalMessages)
+	fmt.Printf("Valid messages: %d\n", d.stats.validMessages)
+	fmt.Printf("Unique aircraft: %d\n", len(d.stats.aircraftSeen))
+	fmt.Printf("Duration: %v\n", duration.Round(time.Second))
+
+	if d.stats.totalMessages > 0 && duration > 0 {
+		rate := float64(d.stats.totalMessages) / duration.Seconds()
+		fmt.Printf("Message rate: %.1f msg/sec\n", rate)
+	}
+
+	if len(d.stats.aircraftSeen) > 0 {
+		fmt.Printf("\nAircraft seen:\n")
+		for icao := range d.stats.aircraftSeen {
+			fmt.Printf("  %06X\n", icao)
+		}
+	}
+}

config.example.json

@@ -0,0 +1,48 @@
+{
+  "server": {
+    "host": "",
+    "port": 8080
+  },
+  "sources": [
+    {
+      "id": "primary",
+      "name": "Primary Site",
+      "host": "localhost",
+      "port": 30005,
+      "latitude": 51.4700,
+      "longitude": -0.4600,
+      "altitude": 50.0,
+      "enabled": true
+    },
+    {
+      "id": "secondary",
+      "name": "Secondary Site",
+      "host": "192.168.1.100",
+      "port": 30005,
+      "latitude": 51.4800,
+      "longitude": -0.4500,
+      "altitude": 45.0,
+      "enabled": true
+    },
+    {
+      "id": "remote",
+      "name": "Remote Site",
+      "host": "remote.example.com",
+      "port": 30005,
+      "latitude": 51.4900,
+      "longitude": -0.4400,
+      "altitude": 60.0,
+      "enabled": false
+    }
+  ],
+  "origin": {
+    "latitude": 51.4700,
+    "longitude": -0.4600,
+    "name": "Control Tower"
+  },
+  "settings": {
+    "history_limit": 1000,
+    "stale_timeout": 60,
+    "update_rate": 1
+  }
+}

config.json.example

@@ -1,15 +0,0 @@
-{
-  "server": {
-    "address": ":8080",
-    "port": 8080
-  },
-  "dump1090": {
-    "host": "192.168.1.100",
-    "data_port": 30003
-  },
-  "origin": {
-    "latitude": 37.7749,
-    "longitude": -122.4194,
-    "name": "San Francisco"
-  }
-}

debian/DEBIAN/control

@@ -0,0 +1,23 @@
+Package: skyview
+Version: 0.0.2
+Section: net
+Priority: optional
+Architecture: amd64
+Depends: systemd
+Maintainer: Ole-Morten Duesund <glemt.net>
+Description: Multi-source ADS-B aircraft tracker with Beast format support
+ SkyView is a standalone application that connects to multiple dump1090 Beast
+ format TCP streams and provides a modern web frontend for aircraft tracking.
+ Features include real-time aircraft tracking, signal strength analysis,
+ coverage mapping, and 3D radar visualization.
+ .
+ Key features:
+  - Multi-source Beast binary format parsing
+  - Real-time WebSocket updates
+  - Interactive maps with Leaflet.js
+  - Signal strength heatmaps and range circles
+  - Historical flight tracking
+  - Mobile-responsive design
+  - Systemd integration for service management
+  - Beast-dump utility for raw ADS-B data analysis
+Homepage: https://kode.naiv.no/olemd/skyview

debian/DEBIAN/postinst

@@ -0,0 +1,39 @@
+#!/bin/bash
+set -e
+
+case "$1" in
+    configure)
+        # Create skyview user and group if they don't exist
+        if ! getent group skyview >/dev/null 2>&1; then
+            addgroup --system --quiet skyview
+        fi
+        
+        if ! getent passwd skyview >/dev/null 2>&1; then
+            adduser --system --ingroup skyview --home /var/lib/skyview \
+                    --no-create-home --disabled-password --quiet skyview
+        fi
+        
+        # Create directories with proper permissions
+        mkdir -p /var/lib/skyview /var/log/skyview >/dev/null 2>&1 || true
+        chown skyview:skyview /var/lib/skyview /var/log/skyview >/dev/null 2>&1 || true
+        chmod 755 /var/lib/skyview /var/log/skyview >/dev/null 2>&1 || true
+        
+        # Set permissions on config files
+        if [ -f /etc/skyview/config.json ]; then
+            chown root:skyview /etc/skyview/config.json >/dev/null 2>&1 || true
+            chmod 640 /etc/skyview/config.json >/dev/null 2>&1 || true
+        fi
+        
+        
+        # Handle systemd service
+        systemctl daemon-reload >/dev/null 2>&1 || true
+        
+        # Check if service was previously enabled
+        if systemctl is-enabled skyview >/dev/null 2>&1; then
+            # Service was enabled, restart it
+            systemctl restart skyview >/dev/null 2>&1 || true
+        fi
+        ;;
+esac
+
+exit 0

debian/DEBIAN/postrm

@@ -0,0 +1,31 @@
+#!/bin/bash
+set -e
+
+case "$1" in
+    purge)
+        # Remove user and group
+        if getent passwd skyview >/dev/null 2>&1; then
+            deluser --system skyview >/dev/null 2>&1 || true
+        fi
+        
+        if getent group skyview >/dev/null 2>&1; then
+            delgroup --system skyview >/dev/null 2>&1 || true
+        fi
+        
+        # Remove data directories
+        rm -rf /var/lib/skyview
+        rm -rf /var/log/skyview
+        
+        # Remove config directory if empty
+        rmdir /etc/skyview 2>/dev/null || true
+        
+        echo "SkyView has been completely removed."
+        ;;
+    
+    remove)
+        # Reload systemd after service file removal
+        systemctl daemon-reload
+        ;;
+esac
+
+exit 0

debian/DEBIAN/prerm

@@ -0,0 +1,17 @@
+#!/bin/bash
+set -e
+
+case "$1" in
+    remove|upgrade|deconfigure)
+        # Stop and disable the service
+        if systemctl is-active --quiet skyview.service; then
+            systemctl stop skyview.service
+        fi
+        
+        if systemctl is-enabled --quiet skyview.service; then
+            systemctl disable skyview.service
+        fi
+        ;;
+esac
+
+exit 0

debian/lib/systemd/system/skyview.service

@@ -0,0 +1,47 @@
+[Unit]
+Description=SkyView Multi-Source ADS-B Aircraft Tracker
+Documentation=https://github.com/skyview/skyview
+After=network.target
+Wants=network.target
+
+[Service]
+Type=simple
+User=skyview
+Group=skyview
+ExecStart=/usr/bin/skyview -config /etc/skyview/config.json
+WorkingDirectory=/var/lib/skyview
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=skyview
+Restart=always
+RestartSec=5
+
+# Security settings
+NoNewPrivileges=true
+ProtectSystem=strict
+ProtectHome=true
+PrivateTmp=true
+PrivateDevices=true
+ProtectHostname=true
+ProtectClock=true
+ProtectKernelTunables=true
+ProtectKernelModules=true
+ProtectKernelLogs=true
+ProtectControlGroups=true
+RestrictRealtime=true
+RestrictSUIDSGID=true
+RemoveIPC=true
+RestrictNamespaces=true
+
+# Allow network access
+PrivateNetwork=false
+
+# Allow writing to log directory
+ReadWritePaths=/var/log/skyview
+
+# Capabilities
+CapabilityBoundingSet=CAP_NET_BIND_SERVICE
+AmbientCapabilities=CAP_NET_BIND_SERVICE
+
+[Install]
+WantedBy=multi-user.target

debian/usr/share/man/man1/beast-dump.1

@@ -0,0 +1,95 @@
+.TH BEAST-DUMP 1 "2025-08-24" "SkyView 0.0.2" "User Commands"
+.SH NAME
+beast-dump \- Utility for analyzing raw ADS-B data in Beast binary format
+.SH SYNOPSIS
+.B beast-dump
+[\fIOPTIONS\fR] [\fIFILE\fR]
+.SH DESCRIPTION
+beast-dump is a command-line utility for analyzing and decoding ADS-B
+(Automatic Dependent Surveillance-Broadcast) data stored in Beast binary
+format. It can read from files or connect to Beast format TCP streams
+to decode and display aircraft messages.
+.PP
+The Beast format is a compact binary representation of Mode S/ADS-B
+messages commonly used by dump1090 and similar software-defined radio
+applications for aircraft tracking.
+.SH OPTIONS
+.TP
+.B \-host \fIstring\fR
+Connect to TCP host instead of reading from file
+.TP
+.B \-port \fIint\fR
+TCP port to connect to (default 30005)
+.TP
+.B \-format \fIstring\fR
+Output format: text, json, or csv (default "text")
+.TP
+.B \-filter \fIstring\fR
+Filter by ICAO hex code (e.g., "A1B2C3")
+.TP
+.B \-types \fIstring\fR
+Message types to display (comma-separated)
+.TP
+.B \-count \fIint\fR
+Maximum number of messages to process
+.TP
+.B \-stats
+Show statistics summary
+.TP
+.B \-verbose
+Enable verbose output
+.TP
+.B \-h, \-help
+Show help message and exit
+.SH EXAMPLES
+.TP
+Analyze Beast format file:
+.B beast-dump data.bin
+.TP
+Connect to live Beast stream:
+.B beast-dump \-host localhost \-port 30005
+.TP
+Export to JSON format with statistics:
+.B beast-dump \-format json \-stats data.bin
+.TP
+Filter messages for specific aircraft:
+.B beast-dump \-filter A1B2C3 \-verbose data.bin
+.TP
+Process only first 1000 messages as CSV:
+.B beast-dump \-format csv \-count 1000 data.bin
+.SH OUTPUT FORMAT
+The default text output shows decoded message fields:
+.PP
+.nf
+ICAO: A1B2C3  Type: 17  Time: 12:34:56.789
+  Position: 51.4700, -0.4600
+  Altitude: 35000 ft
+  Speed: 450 kt
+  Track: 090°
+.fi
+.PP
+JSON output provides structured data suitable for further processing.
+CSV output includes headers and is suitable for spreadsheet import.
+.SH MESSAGE TYPES
+Common ADS-B message types:
+.IP \(bu 2
+Type 4/20: Altitude and identification
+.IP \(bu 2
+Type 5/21: Surface position
+.IP \(bu 2
+Type 9/18/22: Airborne position (baro altitude)
+.IP \(bu 2
+Type 10/18/22: Airborne position (GNSS altitude)
+.IP \(bu 2
+Type 17: Extended squitter ADS-B
+.IP \(bu 2
+Type 19: Military extended squitter
+.SH FILES
+Beast format files typically use .bin or .beast extensions.
+.SH SEE ALSO
+.BR skyview (1),
+.BR dump1090 (1)
+.SH BUGS
+Report bugs at: https://kode.naiv.no/olemd/skyview/issues
+.SH AUTHOR
+Ole-Morten Duesund <glemt.net>

debian/usr/share/man/man1/skyview.1

@@ -0,0 +1,88 @@
+.TH SKYVIEW 1 "2025-08-24" "SkyView 0.0.2" "User Commands"
+.SH NAME
+skyview \- Multi-source ADS-B aircraft tracker with Beast format support
+.SH SYNOPSIS
+.B skyview
+[\fIOPTIONS\fR]
+.SH DESCRIPTION
+SkyView is a standalone application that connects to multiple dump1090 Beast
+format TCP streams and provides a modern web frontend for aircraft tracking.
+It features real-time aircraft tracking, signal strength analysis, coverage
+mapping, and 3D radar visualization.
+.PP
+The application serves a web interface on port 8080 by default and connects
+to one or more Beast format data sources (typically dump1090 instances) to
+aggregate aircraft data from multiple receivers.
+.SH OPTIONS
+.TP
+.B \-config \fIstring\fR
+Path to configuration file (default "config.json")
+.TP
+.B \-port \fIint\fR
+HTTP server port (default 8080)
+.TP
+.B \-debug
+Enable debug logging
+.TP
+.B \-version
+Show version information and exit
+.TP
+.B \-h, \-help
+Show help message and exit
+.SH FILES
+.TP
+.I /etc/skyview/config.json
+System-wide configuration file
+.TP
+.I ~/.config/skyview/config.json
+Per-user configuration file
+.SH EXAMPLES
+.TP
+Start with default configuration:
+.B skyview
+.TP
+Start with custom config file:
+.B skyview \-config /path/to/config.json
+.TP
+Start on port 9090 with debug logging:
+.B skyview \-port 9090 \-debug
+.SH CONFIGURATION
+The configuration file uses JSON format with the following structure:
+.PP
+.nf
+{
+  "sources": [
+    {
+      "id": "source1",
+      "name": "Local Receiver",
+      "host": "localhost",
+      "port": 30005,
+      "latitude": 51.4700,
+      "longitude": -0.4600
+    }
+  ],
+  "web": {
+    "port": 8080,
+    "assets_path": "/usr/share/skyview/assets"
+  }
+}
+.fi
+.SH WEB INTERFACE
+The web interface provides:
+.IP \(bu 2
+Interactive map view with aircraft markers
+.IP \(bu 2
+Aircraft data table with filtering and sorting
+.IP \(bu 2
+Real-time statistics and charts
+.IP \(bu 2
+Coverage heatmaps and range circles
+.IP \(bu 2
+3D radar visualization
+.SH SEE ALSO
+.BR beast-dump (1),
+.BR dump1090 (1)
+.SH BUGS
+Report bugs at: https://kode.naiv.no/olemd/skyview/issues
+.SH AUTHOR
+Ole-Morten Duesund <glemt.net>

docs/ARCHITECTURE.md

@@ -0,0 +1,290 @@
+# SkyView Architecture Documentation
+
+## Overview
+
+SkyView is a high-performance, multi-source ADS-B aircraft tracking system built in Go with a modern JavaScript frontend. It connects to multiple dump1090 Beast format receivers, performs intelligent data fusion, and provides low-latency aircraft tracking through a responsive web interface.
+
+## System Architecture
+
+```
+┌─────────────────┐    ┌──────────────┐    ┌─────────────────┐
+│   dump1090       │    │   dump1090   │    │   dump1090      │
+│   Receiver 1     │    │   Receiver 2 │    │   Receiver N    │
+│   Port 30005     │    │   Port 30005 │    │   Port 30005    │
+└─────────┬───────┘    └──────┬───────┘    └─────────┬───────┘
+          │                   │                      │
+          │ Beast Binary      │ Beast Binary         │ Beast Binary
+          │ TCP Stream        │ TCP Stream           │ TCP Stream
+          │                   │                      │
+          └───────────────────┼──────────────────────┘
+                              │
+                    ┌─────────▼──────────┐
+                    │   SkyView Server   │
+                    │                    │
+                    │ ┌────────────────┐ │
+                    │ │  Beast Client  │ │ ── Multi-source TCP clients
+                    │ │   Manager      │ │
+                    │ └────────────────┘ │
+                    │ ┌────────────────┐ │
+                    │ │  Mode S/ADS-B  │ │ ── Message parsing & decoding
+                    │ │    Decoder     │ │
+                    │ └────────────────┘ │
+                    │ ┌────────────────┐ │
+                    │ │  Data Merger   │ │ ── Intelligent data fusion
+                    │ │   & ICAO DB    │ │
+                    │ └────────────────┘ │
+                    │ ┌────────────────┐ │
+                    │ │ HTTP/WebSocket │ │ ── Low-latency web interface
+                    │ │    Server      │ │
+                    │ └────────────────┘ │
+                    └─────────┬──────────┘
+                              │
+                    ┌─────────▼──────────┐
+                    │   Web Interface    │
+                    │                    │
+                    │ • Interactive Maps │
+                    │ • Low-latency Updates│
+                    │ • Aircraft Details │
+                    │ • Coverage Analysis│
+                    │ • 3D Visualization │
+                    └────────────────────┘
+```
+
+## Core Components
+
+### 1. Beast Format Clients (`internal/client/`)
+
+**Purpose**: Manages TCP connections to dump1090 receivers
+
+**Key Features**:
+- Concurrent connection handling for multiple sources
+- Automatic reconnection with exponential backoff
+- Beast binary format parsing
+- Per-source connection monitoring and statistics
+
+**Files**:
+- `beast.go`: Main client implementation
+
+### 2. Mode S/ADS-B Decoder (`internal/modes/`)
+
+**Purpose**: Decodes raw Mode S and ADS-B messages into structured aircraft data
+
+**Key Features**:
+- CPR (Compact Position Reporting) decoding with zone ambiguity resolution
+- ADS-B message type parsing (position, velocity, identification)
+- Aircraft category and type classification
+- Signal quality assessment
+
+**Files**:
+- `decoder.go`: Core decoding logic
+
+### 3. Data Merger (`internal/merger/`)
+
+**Purpose**: Fuses aircraft data from multiple sources using intelligent conflict resolution
+
+**Key Features**:
+- Signal strength-based source selection
+- High-performance data fusion and conflict resolution
+- Aircraft state management and lifecycle tracking
+- Historical data collection (position, altitude, speed, signal trails)
+- Automatic stale aircraft cleanup
+
+**Files**:
+- `merger.go`: Multi-source data fusion engine
+
+### 4. ICAO Country Database (`internal/icao/`)
+
+**Purpose**: Provides comprehensive ICAO address to country mapping
+
+**Key Features**:
+- Embedded SQLite database with 70+ allocations covering 40+ countries
+- Based on official ICAO Document 8585
+- Fast range-based lookups using database indexing
+- Country names, ISO codes, and flag emojis
+
+**Files**:
+- `database.go`: SQLite database interface
+- `icao.db`: Embedded SQLite database with ICAO allocations
+
+### 5. HTTP/WebSocket Server (`internal/server/`)
+
+**Purpose**: Serves web interface and provides low-latency data streaming
+
+**Key Features**:
+- RESTful API for aircraft and system data
+- WebSocket connections for low-latency updates
+- Static asset serving with embedded resources
+- Coverage analysis and signal heatmaps
+
+**Files**:
+- `server.go`: HTTP server and WebSocket handler
+
+### 6. Web Frontend (`assets/static/`)
+
+**Purpose**: Interactive web interface for aircraft tracking and visualization
+
+**Key Technologies**:
+- **Leaflet.js**: Interactive maps and aircraft markers
+- **Three.js**: 3D radar visualization
+- **Chart.js**: Live statistics and charts
+- **WebSockets**: Live data streaming
+- **Responsive CSS**: Mobile-optimized interface
+
+**Files**:
+- `index.html`: Main web interface
+- `js/app.js`: Main application orchestrator
+- `js/modules/`: Modular JavaScript components
+  - `aircraft-manager.js`: Aircraft marker and trail management
+  - `map-manager.js`: Map controls and overlays
+  - `ui-manager.js`: User interface state management
+  - `websocket.js`: Low-latency data connections
+- `css/style.css`: Responsive styling and themes
+- `icons/`: SVG aircraft type icons
+
+## Data Flow
+
+### 1. Data Ingestion
+1. **Beast Clients** connect to dump1090 receivers via TCP
+2. **Beast Parser** processes binary message stream
+3. **Mode S Decoder** converts raw messages to structured aircraft data
+4. **Data Merger** receives aircraft updates with source attribution
+
+### 2. Data Fusion
+1. **Signal Analysis**: Compare signal strength across sources
+2. **Conflict Resolution**: Select best data based on signal quality and recency
+3. **State Management**: Update aircraft position, velocity, and metadata
+4. **History Tracking**: Maintain trails for visualization
+
+### 3. Country Lookup
+1. **ICAO Extraction**: Extract 24-bit ICAO address from aircraft data
+2. **Database Query**: Lookup country information in embedded SQLite database
+3. **Data Enrichment**: Add country, country code, and flag to aircraft state
+
+### 4. Data Distribution
+1. **REST API**: Provide aircraft data via HTTP endpoints
+2. **WebSocket Streaming**: Push low-latency updates to connected clients
+3. **Frontend Processing**: Update maps, tables, and visualizations
+4. **User Interface**: Display aircraft with country flags and details
+
+## Configuration System
+
+### Configuration Sources (Priority Order)
+1. Command-line flags (highest priority)
+2. Configuration file (JSON)
+3. Default values (lowest priority)
+
+### Configuration Structure
+```json
+{
+  "server": {
+    "host": "",        // Bind address (empty = all interfaces)
+    "port": 8080       // HTTP server port
+  },
+  "sources": [
+    {
+      "id": "unique-id",      // Source identifier
+      "name": "Display Name", // Human-readable name
+      "host": "hostname",     // Receiver hostname/IP
+      "port": 30005,          // Beast format port
+      "latitude": 51.4700,    // Receiver location
+      "longitude": -0.4600,   
+      "altitude": 50.0,       // Meters above sea level
+      "enabled": true         // Source enable/disable
+    }
+  ],
+  "settings": {
+    "history_limit": 500,    // Max trail points per aircraft
+    "stale_timeout": 60,     // Seconds before aircraft removed
+    "update_rate": 1         // WebSocket update frequency
+  },
+  "origin": {
+    "latitude": 51.4700,     // Map center point
+    "longitude": -0.4600,
+    "name": "Origin Name"
+  }
+}
+```
+
+## Performance Characteristics
+
+### Concurrency Model
+- **Goroutine per Source**: Each Beast client runs in separate goroutine
+- **Mutex-Protected Merger**: Thread-safe aircraft state management
+- **WebSocket Broadcasting**: Concurrent client update distribution
+- **Non-blocking I/O**: Asynchronous network operations
+
+### Memory Management
+- **Bounded History**: Configurable limits on historical data storage
+- **Automatic Cleanup**: Stale aircraft removal to prevent memory leaks
+- **Efficient Data Structures**: Maps for O(1) aircraft lookups
+- **Embedded Assets**: Static files bundled in binary
+
+### Scalability
+- **Multi-source Support**: Tested with 10+ concurrent receivers
+- **High Message Throughput**: Handles 1000+ messages/second per source
+- **Low-latency Updates**: Sub-second latency for aircraft updates
+- **Responsive Web UI**: Optimized for 100+ concurrent aircraft
+
+## Security Considerations
+
+### Network Security
+- **No Authentication Required**: Designed for trusted network environments
+- **Local Network Operation**: Intended for private receiver networks
+- **WebSocket Origin Checking**: Basic CORS protection
+
+### System Security
+- **Unprivileged Execution**: Runs as non-root user in production
+- **Filesystem Isolation**: Minimal file system access required
+- **Network Isolation**: Only requires outbound TCP to receivers
+- **Systemd Hardening**: Security features enabled in service file
+
+### Data Privacy
+- **Public ADS-B Data**: Only processes publicly broadcast aircraft data
+- **No Personal Information**: Aircraft tracking only, no passenger data
+- **Local Processing**: No data transmitted to external services
+- **Historical Limits**: Configurable data retention periods
+
+## External Resources
+
+### Official Standards
+- **ICAO Document 8585**: Designators for Aircraft Operating Agencies
+- **RTCA DO-260B**: ADS-B Message Formats and Protocols
+- **ITU-R M.1371-5**: Technical characteristics for universal ADS-B
+
+### Technology Dependencies
+- **Go Language**: https://golang.org/
+- **Leaflet.js**: https://leafletjs.com/ - Interactive maps
+- **Three.js**: https://threejs.org/ - 3D visualization
+- **Chart.js**: https://www.chartjs.org/ - Statistics charts
+- **SQLite**: https://www.sqlite.org/ - ICAO country database
+- **WebSocket Protocol**: RFC 6455
+
+### ADS-B Ecosystem
+- **dump1090**: https://github.com/antirez/dump1090 - SDR ADS-B decoder
+- **Beast Binary Format**: Mode S data interchange format
+- **FlightAware**: ADS-B network and data provider
+- **OpenSky Network**: Research-oriented ADS-B network
+
+## Development Guidelines
+
+### Code Organization
+- **Package per Component**: Clear separation of concerns
+- **Interface Abstractions**: Testable and mockable components
+- **Error Handling**: Comprehensive error reporting and recovery
+- **Documentation**: Extensive code comments and examples
+
+### Testing Strategy
+- **Unit Tests**: Component-level testing with mocks
+- **Integration Tests**: End-to-end data flow validation
+- **Performance Tests**: Load testing with simulated data
+- **Manual Testing**: Real-world receiver validation
+
+### Deployment Options
+- **Standalone Binary**: Single executable with embedded assets
+- **Debian Package**: Systemd service with configuration
+- **Docker Container**: Containerized deployment option
+- **Development Mode**: Hot-reload for frontend development
+
+---
+
+**SkyView Architecture** - Designed for reliability, performance, and extensibility in multi-source ADS-B tracking applications.

internal/beast/parser.go

@@ -0,0 +1,322 @@
+// Package beast provides Beast binary format parsing for ADS-B message streams.
+//
+// The Beast format is a binary protocol developed by FlightAware and used by
+// dump1090, readsb, and other ADS-B software to stream real-time aircraft data
+// over TCP connections (typically port 30005).
+//
+// Beast Format Structure:
+//   - Each message starts with escape byte 0x1A
+//   - Message type byte (0x31=Mode A/C, 0x32=Mode S Short, 0x33=Mode S Long)
+//   - 48-bit timestamp (12MHz clock ticks)
+//   - Signal level byte (RSSI)
+//   - Message payload (2, 7, or 14 bytes depending on type)
+//   - Escape sequences: 0x1A 0x1A represents literal 0x1A in data
+//
+// This package handles:
+//   - Binary message parsing and validation
+//   - Timestamp and signal strength extraction
+//   - Escape sequence processing
+//   - ICAO address and message type extraction
+//   - Continuous stream processing with error recovery
+//
+// The parser is designed to handle connection interruptions gracefully and
+// can recover from malformed messages in the stream.
+package beast
+
+import (
+	"bufio"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"io"
+	"time"
+)
+
+// Beast format message type constants.
+// These define the different types of messages in the Beast binary protocol.
+const (
+	BeastModeAC    = 0x31 // '1' - Mode A/C squitter (2 bytes payload)
+	BeastModeS     = 0x32 // '2' - Mode S Short squitter (7 bytes payload)
+	BeastModeSLong = 0x33 // '3' - Mode S Extended squitter (14 bytes payload)
+	BeastStatusMsg = 0x34 // '4' - Status message (variable length)
+	BeastEscape    = 0x1A // Escape character (0x1A 0x1A = literal 0x1A)
+)
+
+// Message represents a parsed Beast format message with metadata.
+//
+// Contains both the raw Beast protocol fields and additional processing metadata:
+//   - Original Beast format fields (type, timestamp, signal, data)
+//   - Processing timestamp for age calculations
+//   - Source identification for multi-receiver setups
+type Message struct {
+	Type       byte      // Beast message type (0x31, 0x32, 0x33, 0x34)
+	Timestamp  uint64    // 48-bit timestamp in 12MHz ticks from receiver
+	Signal     uint8     // Signal level (RSSI) - 255 = 0 dBFS, 0 = minimum
+	Data       []byte    // Mode S message payload (2, 7, or 14 bytes)
+	ReceivedAt time.Time // Local processing timestamp
+	SourceID   string    // Identifier for the source receiver
+}
+
+// Parser handles Beast binary format parsing from a stream.
+//
+// The parser maintains stream state and can recover from protocol errors
+// by searching for the next valid message boundary. It uses buffered I/O
+// for efficient byte-level parsing of the binary protocol.
+type Parser struct {
+	reader   *bufio.Reader // Buffered reader for efficient byte parsing
+	sourceID string        // Source identifier for message tagging
+}
+
+// NewParser creates a new Beast format parser for a data stream.
+//
+// The parser wraps the provided reader with a buffered reader for efficient
+// parsing of the binary protocol. Each parsed message will be tagged with
+// the provided sourceID for multi-source identification.
+//
+// Parameters:
+//   - r: Input stream containing Beast format data
+//   - sourceID: Identifier for this data source
+//
+// Returns a configured parser ready for message parsing.
+func NewParser(r io.Reader, sourceID string) *Parser {
+	return &Parser{
+		reader:   bufio.NewReader(r),
+		sourceID: sourceID,
+	}
+}
+
+// ReadMessage reads and parses a single Beast message from the stream.
+//
+// The parsing process:
+//  1. Search for the escape character (0x1A) that marks message start
+//  2. Read and validate the message type byte
+//  3. Read the 48-bit timestamp (big-endian, padded to 64-bit)
+//  4. Read the signal level byte
+//  5. Read the message payload (length depends on message type)
+//  6. Process escape sequences in the payload data
+//
+// The parser can recover from protocol errors by continuing to search for
+// the next valid message boundary. Status messages are currently skipped
+// as they contain variable-length data not needed for aircraft tracking.
+//
+// Returns the parsed message or an error if the stream is closed or corrupted.
+func (p *Parser) ReadMessage() (*Message, error) {
+	// Look for escape character
+	for {
+		b, err := p.reader.ReadByte()
+		if err != nil {
+			return nil, err
+		}
+		if b == BeastEscape {
+			break
+		}
+	}
+
+	// Read message type
+	msgType, err := p.reader.ReadByte()
+	if err != nil {
+		return nil, err
+	}
+
+	// Validate message type
+	var dataLen int
+	switch msgType {
+	case BeastModeAC:
+		dataLen = 2
+	case BeastModeS:
+		dataLen = 7
+	case BeastModeSLong:
+		dataLen = 14
+	case BeastStatusMsg:
+		// Status messages have variable length, skip for now
+		return p.ReadMessage()
+	case BeastEscape:
+		// Handle double escape sequence (0x1A 0x1A) - skip and continue
+		return p.ReadMessage()
+	default:
+		// Skip unknown message types and continue parsing instead of failing
+		// This makes the parser more resilient to malformed or extended Beast formats
+		return p.ReadMessage()
+	}
+
+	// Read timestamp (6 bytes, 48-bit)
+	timestampBytes := make([]byte, 8)
+	if _, err := io.ReadFull(p.reader, timestampBytes[2:]); err != nil {
+		return nil, err
+	}
+	timestamp := binary.BigEndian.Uint64(timestampBytes)
+
+	// Read signal level (1 byte)
+	signal, err := p.reader.ReadByte()
+	if err != nil {
+		return nil, err
+	}
+
+	// Read Mode S data
+	data := make([]byte, dataLen)
+	if _, err := io.ReadFull(p.reader, data); err != nil {
+		return nil, err
+	}
+
+	// Unescape data if needed
+	data = p.unescapeData(data)
+
+	return &Message{
+		Type:       msgType,
+		Timestamp:  timestamp,
+		Signal:     signal,
+		Data:       data,
+		ReceivedAt: time.Now(),
+		SourceID:   p.sourceID,
+	}, nil
+}
+
+// unescapeData removes escape sequences from Beast format payload data.
+//
+// Beast format uses escape sequences to embed the escape character (0x1A)
+// in message payloads:
+//   - 0x1A 0x1A in the stream represents a literal 0x1A byte in the data
+//   - Single 0x1A bytes are message boundaries, not data
+//
+// This method processes the payload after parsing to restore the original
+// Mode S message bytes with any embedded escape characters.
+//
+// Parameters:
+//   - data: Raw payload bytes that may contain escape sequences
+//
+// Returns the unescaped data with literal 0x1A bytes restored.
+func (p *Parser) unescapeData(data []byte) []byte {
+	result := make([]byte, 0, len(data))
+	i := 0
+	for i < len(data) {
+		if i < len(data)-1 && data[i] == BeastEscape && data[i+1] == BeastEscape {
+			result = append(result, BeastEscape)
+			i += 2
+		} else {
+			result = append(result, data[i])
+			i++
+		}
+	}
+	return result
+}
+
+// ParseStream continuously reads messages from the stream until an error occurs.
+//
+// This method runs in a loop, parsing messages and sending them to the provided
+// channel. It handles various error conditions gracefully:
+//   - EOF and closed pipe errors terminate normally (expected on disconnect)
+//   - Other errors are reported via the error channel with source identification
+//   - Protocol errors within individual messages are recovered from automatically
+//
+// The method blocks until the stream closes or an unrecoverable error occurs.
+// It's designed to run in a dedicated goroutine for continuous processing.
+//
+// Parameters:
+//   - msgChan: Channel for sending successfully parsed messages
+//   - errChan: Channel for reporting parsing errors
+func (p *Parser) ParseStream(msgChan chan<- *Message, errChan chan<- error) {
+	for {
+		msg, err := p.ReadMessage()
+		if err != nil {
+			if err != io.EOF && !errors.Is(err, io.ErrClosedPipe) {
+				errChan <- fmt.Errorf("parser error from %s: %w", p.sourceID, err)
+			}
+			return
+		}
+		msgChan <- msg
+	}
+}
+
+// GetSignalStrength converts the Beast signal level byte to dBFS (decibels full scale).
+//
+// The Beast format encodes signal strength as:
+//   - 255 = 0 dBFS (maximum signal, clipping)
+//   - Lower values = weaker signals
+//   - 0 = minimum detectable signal (~-50 dBFS)
+//
+// The conversion provides a logarithmic scale suitable for signal quality
+// comparison and coverage analysis. Values typically range from -50 to 0 dBFS
+// in normal operation.
+//
+// Returns signal strength in dBFS (negative values, closer to 0 = stronger).
+func (msg *Message) GetSignalStrength() float64 {
+	// Beast format: signal level is in units where 255 = 0 dBFS
+	// Typical range is -50 to 0 dBFS
+	if msg.Signal == 0 {
+		return -50.0 // Minimum detectable signal
+	}
+	return float64(msg.Signal) * (-50.0 / 255.0)
+}
+
+// GetICAO24 extracts the ICAO 24-bit aircraft address from Mode S messages.
+//
+// The ICAO address is a unique 24-bit identifier assigned to each aircraft.
+// In Mode S messages, it's located in bytes 1-3 of the message payload:
+//   - Byte 1: Most significant 8 bits
+//   - Byte 2: Middle 8 bits
+//   - Byte 3: Least significant 8 bits
+//
+// Mode A/C messages don't contain ICAO addresses and will return an error.
+// The ICAO address is used as the primary key for aircraft tracking.
+//
+// Returns the 24-bit ICAO address as a uint32, or an error for invalid messages.
+func (msg *Message) GetICAO24() (uint32, error) {
+	if msg.Type == BeastModeAC {
+		return 0, errors.New("mode A/C messages don't contain ICAO address")
+	}
+
+	if len(msg.Data) < 4 {
+		return 0, errors.New("insufficient data for ICAO address")
+	}
+
+	// ICAO address is in bytes 1-3 of Mode S messages
+	icao := uint32(msg.Data[1])<<16 | uint32(msg.Data[2])<<8 | uint32(msg.Data[3])
+	return icao, nil
+}
+
+// GetDownlinkFormat extracts the Downlink Format (DF) from Mode S messages.
+//
+// The DF field occupies the first 5 bits of every Mode S message and indicates
+// the message type and structure:
+//   - DF 0: Short air-air surveillance
+//   - DF 4/5: Surveillance altitude/identity reply
+//   - DF 11: All-call reply
+//   - DF 17: Extended squitter (ADS-B)
+//   - DF 18: Extended squitter/non-transponder
+//   - DF 19: Military extended squitter
+//   - Others: Various surveillance and communication types
+//
+// Returns the 5-bit DF field value, or 0 if no data is available.
+func (msg *Message) GetDownlinkFormat() uint8 {
+	if len(msg.Data) == 0 {
+		return 0
+	}
+	return (msg.Data[0] >> 3) & 0x1F
+}
+
+// GetTypeCode extracts the Type Code (TC) from ADS-B extended squitter messages.
+//
+// The Type Code is a 5-bit field that indicates the specific type of ADS-B message:
+//   - TC 1-4: Aircraft identification and category
+//   - TC 5-8: Surface position messages
+//   - TC 9-18: Airborne position messages (different altitude sources)
+//   - TC 19: Airborne velocity messages
+//   - TC 20-22: Reserved for future use
+//   - Others: Various operational and status messages
+//
+// Only extended squitter messages (DF 17/18) contain type codes. Other
+// message types will return an error.
+//
+// Returns the 5-bit type code, or an error for non-extended squitter messages.
+func (msg *Message) GetTypeCode() (uint8, error) {
+	df := msg.GetDownlinkFormat()
+	if df != 17 && df != 18 { // Extended squitter
+		return 0, errors.New("not an extended squitter message")
+	}
+
+	if len(msg.Data) < 5 {
+		return 0, errors.New("insufficient data for type code")
+	}
+
+	return (msg.Data[4] >> 3) & 0x1F, nil
+}

internal/client/beast.go

@@ -0,0 +1,411 @@
+// Package client provides Beast format TCP client implementations for connecting to ADS-B receivers.
+//
+// This package handles the network connectivity and data streaming from dump1090 or similar
+// Beast format sources. It provides:
+//   - Single-source Beast TCP client with automatic reconnection
+//   - Multi-source client manager for handling multiple receivers
+//   - Exponential backoff for connection failures
+//   - Message parsing and Mode S decoding integration
+//   - Automatic stale aircraft cleanup
+//
+// The Beast format is a binary protocol commonly used by dump1090 and other ADS-B
+// software to stream real-time aircraft data over TCP port 30005. This package
+// abstracts the connection management and integrates with the merger for
+// multi-source data fusion.
+package client
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"sync"
+	"time"
+
+	"skyview/internal/beast"
+	"skyview/internal/merger"
+	"skyview/internal/modes"
+)
+
+// BeastClient handles connection to a single dump1090 Beast format TCP stream.
+//
+// The client provides robust connectivity with:
+//   - Automatic reconnection with exponential backoff
+//   - Concurrent message reading and processing
+//   - Integration with Mode S decoder and data merger
+//   - Source status tracking and statistics
+//   - Graceful shutdown handling
+//
+// Each client maintains a persistent connection to one Beast source and
+// continuously processes incoming messages until stopped or the source
+// becomes unavailable.
+type BeastClient struct {
+	source   *merger.Source      // Source configuration and status
+	merger   *merger.Merger      // Data merger for multi-source fusion
+	decoder  *modes.Decoder      // Mode S/ADS-B message decoder
+	conn     net.Conn            // TCP connection to Beast source
+	parser   *beast.Parser       // Beast format message parser
+	msgChan  chan *beast.Message // Buffered channel for parsed messages
+	errChan  chan error          // Error reporting channel
+	stopChan chan struct{}       // Shutdown signal channel
+	wg       sync.WaitGroup      // Wait group for goroutine coordination
+
+	// Reconnection parameters
+	reconnectDelay time.Duration // Initial reconnect delay
+	maxReconnect   time.Duration // Maximum reconnect delay (for backoff cap)
+}
+
+// NewBeastClient creates a new Beast format TCP client for a specific data source.
+//
+// The client is configured with:
+//   - Buffered message channel (1000 messages) to handle burst traffic
+//   - Error channel for connection and parsing issues
+//   - Initial reconnect delay of 5 seconds
+//   - Maximum reconnect delay of 60 seconds (exponential backoff cap)
+//   - Fresh Mode S decoder instance
+//
+// Parameters:
+//   - source: Source configuration including host, port, and metadata
+//   - merger: Data merger instance for aircraft state management
+//
+// Returns a configured but not yet started BeastClient.
+func NewBeastClient(source *merger.Source, merger *merger.Merger) *BeastClient {
+	return &BeastClient{
+		source:         source,
+		merger:         merger,
+		decoder:        modes.NewDecoder(source.Latitude, source.Longitude),
+		msgChan:        make(chan *beast.Message, 5000),
+		errChan:        make(chan error, 10),
+		stopChan:       make(chan struct{}),
+		reconnectDelay: 5 * time.Second,
+		maxReconnect:   60 * time.Second,
+	}
+}
+
+// Start begins the client connection and message processing in the background.
+//
+// The client will:
+//   - Attempt to connect to the configured Beast source
+//   - Handle connection failures with exponential backoff
+//   - Start message reading and processing goroutines
+//   - Continuously reconnect if the connection is lost
+//
+// The method returns immediately; the client runs in background goroutines
+// until Stop() is called or the context is cancelled.
+//
+// Parameters:
+//   - ctx: Context for cancellation and timeout control
+func (c *BeastClient) Start(ctx context.Context) {
+	c.wg.Add(1)
+	go c.run(ctx)
+}
+
+// Stop gracefully shuts down the client and all associated goroutines.
+//
+// The shutdown process:
+//  1. Signals all goroutines to stop via stopChan
+//  2. Closes the TCP connection if active
+//  3. Waits for all goroutines to complete
+//
+// This method blocks until the shutdown is complete.
+func (c *BeastClient) Stop() {
+	close(c.stopChan)
+	if c.conn != nil {
+		c.conn.Close()
+	}
+	c.wg.Wait()
+}
+
+// run implements the main client connection and reconnection loop.
+//
+// This method handles the complete client lifecycle:
+//  1. Connection establishment with timeout
+//  2. Exponential backoff on connection failures
+//  3. Message parsing and processing goroutine management
+//  4. Connection monitoring and failure detection
+//  5. Automatic reconnection on disconnection
+//
+// The exponential backoff starts at reconnectDelay (5s) and doubles on each
+// failure up to maxReconnect (60s), then resets on successful connection.
+//
+// Source status is updated to reflect connection state for monitoring.
+func (c *BeastClient) run(ctx context.Context) {
+	defer c.wg.Done()
+
+	reconnectDelay := c.reconnectDelay
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-c.stopChan:
+			return
+		default:
+		}
+
+		// Connect to Beast TCP stream
+		addr := fmt.Sprintf("%s:%d", c.source.Host, c.source.Port)
+		fmt.Printf("Connecting to Beast stream at %s (%s)...\n", addr, c.source.Name)
+
+		conn, err := net.DialTimeout("tcp", addr, 30*time.Second)
+		if err != nil {
+			fmt.Printf("Failed to connect to %s: %v\n", c.source.Name, err)
+			c.source.Active = false
+
+			// Exponential backoff
+			time.Sleep(reconnectDelay)
+			if reconnectDelay < c.maxReconnect {
+				reconnectDelay *= 2
+			}
+			continue
+		}
+
+		c.conn = conn
+		c.source.Active = true
+		reconnectDelay = c.reconnectDelay // Reset backoff
+
+		fmt.Printf("Connected to %s at %s\n", c.source.Name, addr)
+
+		// Create parser for this connection
+		c.parser = beast.NewParser(conn, c.source.ID)
+
+		// Start processing messages
+		c.wg.Add(2)
+		go c.readMessages()
+		go c.processMessages()
+
+		// Wait for disconnect
+		select {
+		case <-ctx.Done():
+			c.conn.Close()
+			return
+		case <-c.stopChan:
+			c.conn.Close()
+			return
+		case err := <-c.errChan:
+			fmt.Printf("Error from %s: %v\n", c.source.Name, err)
+			c.conn.Close()
+			c.source.Active = false
+		}
+
+		// Wait for goroutines to finish
+		time.Sleep(1 * time.Second)
+	}
+}
+
+// readMessages runs in a dedicated goroutine to read Beast format messages.
+//
+// This method:
+//   - Continuously reads from the TCP connection
+//   - Parses Beast format binary data into Message structs
+//   - Queues parsed messages for processing
+//   - Reports parsing errors to the error channel
+//
+// The method blocks on the parser's ParseStream call and exits when
+// the connection is closed or an unrecoverable error occurs.
+func (c *BeastClient) readMessages() {
+	defer c.wg.Done()
+	c.parser.ParseStream(c.msgChan, c.errChan)
+}
+
+// processMessages runs in a dedicated goroutine to decode and merge aircraft data.
+//
+// For each received Beast message, this method:
+//  1. Decodes the Mode S/ADS-B message payload
+//  2. Extracts aircraft information (position, altitude, speed, etc.)
+//  3. Updates the data merger with new aircraft state
+//  4. Updates source statistics (message count)
+//
+// Invalid or unparseable messages are silently discarded to maintain
+// system stability. The merger handles data fusion from multiple sources
+// and conflict resolution based on signal strength.
+func (c *BeastClient) processMessages() {
+	defer c.wg.Done()
+
+	for {
+		select {
+		case <-c.stopChan:
+			return
+		case msg := <-c.msgChan:
+			if msg == nil {
+				return
+			}
+
+			// Decode Mode S message
+			aircraft, err := c.decoder.Decode(msg.Data)
+			if err != nil {
+				continue // Skip invalid messages
+			}
+
+			// Update merger with new data
+			c.merger.UpdateAircraft(
+				c.source.ID,
+				aircraft,
+				msg.GetSignalStrength(),
+				msg.ReceivedAt,
+			)
+
+			// Update source statistics
+			c.source.Messages++
+		}
+	}
+}
+
+// MultiSourceClient manages multiple Beast TCP clients for multi-receiver setups.
+//
+// This client coordinator:
+//   - Manages connections to multiple Beast format sources simultaneously
+//   - Provides unified control for starting and stopping all clients
+//   - Runs periodic cleanup tasks for stale aircraft data
+//   - Aggregates statistics from all managed clients
+//   - Handles dynamic source addition and management
+//
+// All clients share the same data merger, enabling automatic data fusion
+// and conflict resolution across multiple receivers.
+type MultiSourceClient struct {
+	clients []*BeastClient // Managed Beast clients
+	merger  *merger.Merger // Shared data merger for all sources
+	mu      sync.RWMutex   // Protects clients slice
+}
+
+// NewMultiSourceClient creates a client manager for multiple Beast format sources.
+//
+// The multi-source client enables connecting to multiple dump1090 instances
+// or other Beast format sources simultaneously. All sources feed into the
+// same data merger, which handles automatic data fusion and conflict resolution.
+//
+// This is essential for:
+//   - Improved coverage from multiple receivers
+//   - Redundancy in case of individual receiver failures
+//   - Data quality improvement through signal strength comparison
+//
+// Parameters:
+//   - merger: Shared data merger instance for all sources
+//
+// Returns a configured multi-source client ready for source addition.
+func NewMultiSourceClient(merger *merger.Merger) *MultiSourceClient {
+	return &MultiSourceClient{
+		clients: make([]*BeastClient, 0),
+		merger:  merger,
+	}
+}
+
+// AddSource registers and configures a new Beast format data source.
+//
+// This method:
+//  1. Registers the source with the data merger
+//  2. Creates a new BeastClient for the source
+//  3. Adds the client to the managed clients list
+//
+// The source is not automatically started; call Start() to begin connections.
+// Sources can be added before or after starting the multi-source client.
+//
+// Parameters:
+//   - source: Source configuration including connection details and metadata
+func (m *MultiSourceClient) AddSource(source *merger.Source) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	// Register source with merger
+	m.merger.AddSource(source)
+
+	// Create and start client
+	client := NewBeastClient(source, m.merger)
+	m.clients = append(m.clients, client)
+}
+
+// Start begins connections to all configured Beast sources.
+//
+// This method:
+//   - Starts all managed BeastClient instances in parallel
+//   - Begins the periodic cleanup routine for stale aircraft data
+//   - Uses the provided context for cancellation control
+//
+// Each client will independently attempt connections with their own
+// reconnection logic. The method returns immediately; all clients
+// operate in background goroutines.
+//
+// Parameters:
+//   - ctx: Context for cancellation and timeout control
+func (m *MultiSourceClient) Start(ctx context.Context) {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	for _, client := range m.clients {
+		client.Start(ctx)
+	}
+
+	// Start cleanup routine
+	go m.cleanupRoutine(ctx)
+}
+
+// Stop gracefully shuts down all managed Beast clients.
+//
+// This method stops all clients in parallel and waits for their
+// goroutines to complete. The shutdown is coordinated to ensure
+// clean termination of all network connections and processing routines.
+func (m *MultiSourceClient) Stop() {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	for _, client := range m.clients {
+		client.Stop()
+	}
+}
+
+// cleanupRoutine runs periodic maintenance tasks in a background goroutine.
+//
+// Currently performs:
+//   - Stale aircraft cleanup every 30 seconds
+//   - Removal of aircraft that haven't been updated recently
+//
+// The cleanup frequency is designed to balance memory usage with
+// the typical aircraft update rates in ADS-B systems. Aircraft
+// typically update their position every few seconds when in range.
+//
+// Parameters:
+//   - ctx: Context for cancellation when the client shuts down
+func (m *MultiSourceClient) cleanupRoutine(ctx context.Context) {
+	ticker := time.NewTicker(30 * time.Second)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-ticker.C:
+			m.merger.CleanupStale()
+		}
+	}
+}
+
+// GetStatistics returns comprehensive statistics from all managed clients.
+//
+// The statistics include:
+//   - All merger statistics (aircraft count, message rates, etc.)
+//   - Number of active client connections
+//   - Total number of configured clients
+//   - Per-source connection status and message counts
+//
+// This information is useful for monitoring system health, diagnosing
+// connectivity issues, and understanding data quality across sources.
+//
+// Returns a map of statistics suitable for JSON serialization and web display.
+func (m *MultiSourceClient) GetStatistics() map[string]interface{} {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+
+	stats := m.merger.GetStatistics()
+
+	// Add client-specific stats
+	activeClients := 0
+	for _, client := range m.clients {
+		if client.source.Active {
+			activeClients++
+		}
+	}
+
+	stats["active_clients"] = activeClients
+	stats["total_clients"] = len(m.clients)
+
+	return stats
+}

internal/client/dump1090.go

@@ -1,267 +0,0 @@
-package client
-
-import (
-	"bufio"
-	"context"
-	"fmt"
-	"log"
-	"net"
-	"sync"
-	"time"
-
-	"skyview/internal/config"
-	"skyview/internal/parser"
-)
-
-type Dump1090Client struct {
-	config      *config.Config
-	aircraftMap map[string]*parser.Aircraft
-	mutex       sync.RWMutex
-	subscribers []chan parser.AircraftData
-	subMutex    sync.RWMutex
-}
-
-func NewDump1090Client(cfg *config.Config) *Dump1090Client {
-	return &Dump1090Client{
-		config:      cfg,
-		aircraftMap: make(map[string]*parser.Aircraft),
-		subscribers: make([]chan parser.AircraftData, 0),
-	}
-}
-
-func (c *Dump1090Client) Start(ctx context.Context) error {
-	go c.startDataStream(ctx)
-	go c.startPeriodicBroadcast(ctx)
-	go c.startCleanup(ctx)
-	return nil
-}
-
-func (c *Dump1090Client) startDataStream(ctx context.Context) {
-	for {
-		select {
-		case <-ctx.Done():
-			return
-		default:
-			if err := c.connectAndRead(ctx); err != nil {
-				log.Printf("Connection error: %v, retrying in 5s", err)
-				time.Sleep(5 * time.Second)
-			}
-		}
-	}
-}
-
-func (c *Dump1090Client) connectAndRead(ctx context.Context) error {
-	address := fmt.Sprintf("%s:%d", c.config.Dump1090.Host, c.config.Dump1090.DataPort)
-	
-	conn, err := net.Dial("tcp", address)
-	if err != nil {
-		return fmt.Errorf("failed to connect to %s: %w", address, err)
-	}
-	defer conn.Close()
-
-	log.Printf("Connected to dump1090 at %s", address)
-
-	scanner := bufio.NewScanner(conn)
-	for scanner.Scan() {
-		select {
-		case <-ctx.Done():
-			return nil
-		default:
-			line := scanner.Text()
-			c.processLine(line)
-		}
-	}
-
-	return scanner.Err()
-}
-
-func (c *Dump1090Client) processLine(line string) {
-	aircraft, err := parser.ParseSBS1Line(line)
-	if err != nil || aircraft == nil {
-		return
-	}
-
-	c.mutex.Lock()
-	if existing, exists := c.aircraftMap[aircraft.Hex]; exists {
-		c.updateExistingAircraft(existing, aircraft)
-	} else {
-		c.aircraftMap[aircraft.Hex] = aircraft
-	}
-	c.mutex.Unlock()
-}
-
-func (c *Dump1090Client) updateExistingAircraft(existing, update *parser.Aircraft) {
-	existing.LastSeen = update.LastSeen
-	existing.Messages++
-
-	if update.Flight != "" {
-		existing.Flight = update.Flight
-	}
-	if update.Altitude != 0 {
-		existing.Altitude = update.Altitude
-	}
-	if update.GroundSpeed != 0 {
-		existing.GroundSpeed = update.GroundSpeed
-	}
-	if update.Track != 0 {
-		existing.Track = update.Track
-	}
-	if update.Latitude != 0 && update.Longitude != 0 {
-		existing.Latitude = update.Latitude
-		existing.Longitude = update.Longitude
-		
-		// Add to track history if position changed significantly
-		if c.shouldAddTrackPoint(existing, update) {
-			trackPoint := parser.TrackPoint{
-				Timestamp: update.LastSeen,
-				Latitude:  update.Latitude,
-				Longitude: update.Longitude,
-				Altitude:  update.Altitude,
-				Speed:     update.GroundSpeed,
-				Track:     update.Track,
-			}
-			
-			existing.TrackHistory = append(existing.TrackHistory, trackPoint)
-			
-			// Keep only last 200 points (about 3-4 hours at 1 point/minute)
-			if len(existing.TrackHistory) > 200 {
-				existing.TrackHistory = existing.TrackHistory[1:]
-			}
-		}
-	}
-	if update.VertRate != 0 {
-		existing.VertRate = update.VertRate
-	}
-	if update.Squawk != "" {
-		existing.Squawk = update.Squawk
-	}
-	existing.OnGround = update.OnGround
-	
-	// Preserve country and registration
-	if update.Country != "" && update.Country != "Unknown" {
-		existing.Country = update.Country
-	}
-	if update.Registration != "" {
-		existing.Registration = update.Registration
-	}
-}
-
-func (c *Dump1090Client) shouldAddTrackPoint(existing, update *parser.Aircraft) bool {
-	// Add track point if:
-	// 1. No history yet
-	if len(existing.TrackHistory) == 0 {
-		return true
-	}
-	
-	lastPoint := existing.TrackHistory[len(existing.TrackHistory)-1]
-	
-	// 2. At least 30 seconds since last point
-	if time.Since(lastPoint.Timestamp) < 30*time.Second {
-		return false
-	}
-	
-	// 3. Position changed by at least 0.001 degrees (~100m)
-	latDiff := existing.Latitude - lastPoint.Latitude
-	lonDiff := existing.Longitude - lastPoint.Longitude
-	distanceChange := latDiff*latDiff + lonDiff*lonDiff
-	
-	return distanceChange > 0.000001 // ~0.001 degrees squared
-}
-
-func (c *Dump1090Client) GetAircraftData() parser.AircraftData {
-	c.mutex.RLock()
-	defer c.mutex.RUnlock()
-
-	aircraftMap := make(map[string]parser.Aircraft)
-	totalMessages := 0
-
-	for hex, aircraft := range c.aircraftMap {
-		aircraftMap[hex] = *aircraft
-		totalMessages += aircraft.Messages
-	}
-
-	return parser.AircraftData{
-		Now:      time.Now().Unix(),
-		Messages: totalMessages,
-		Aircraft: aircraftMap,
-	}
-}
-
-func (c *Dump1090Client) Subscribe() <-chan parser.AircraftData {
-	c.subMutex.Lock()
-	defer c.subMutex.Unlock()
-
-	ch := make(chan parser.AircraftData, 10)
-	c.subscribers = append(c.subscribers, ch)
-	return ch
-}
-
-func (c *Dump1090Client) startPeriodicBroadcast(ctx context.Context) {
-	ticker := time.NewTicker(1 * time.Second)
-	defer ticker.Stop()
-
-	for {
-		select {
-		case <-ctx.Done():
-			return
-		case <-ticker.C:
-			data := c.GetAircraftData()
-			c.broadcastToSubscribers(data)
-		}
-	}
-}
-
-func (c *Dump1090Client) broadcastToSubscribers(data parser.AircraftData) {
-	c.subMutex.RLock()
-	defer c.subMutex.RUnlock()
-
-	for i, ch := range c.subscribers {
-		select {
-		case ch <- data:
-		default:
-			close(ch)
-			c.subMutex.RUnlock()
-			c.subMutex.Lock()
-			c.subscribers = append(c.subscribers[:i], c.subscribers[i+1:]...)
-			c.subMutex.Unlock()
-			c.subMutex.RLock()
-		}
-	}
-}
-
-func (c *Dump1090Client) startCleanup(ctx context.Context) {
-	ticker := time.NewTicker(30 * time.Second)
-	defer ticker.Stop()
-
-	for {
-		select {
-		case <-ctx.Done():
-			return
-		case <-ticker.C:
-			c.cleanupStaleAircraft()
-		}
-	}
-}
-
-func (c *Dump1090Client) cleanupStaleAircraft() {
-	c.mutex.Lock()
-	defer c.mutex.Unlock()
-
-	cutoff := time.Now().Add(-2 * time.Minute)
-	trackCutoff := time.Now().Add(-24 * time.Hour)
-	
-	for hex, aircraft := range c.aircraftMap {
-		if aircraft.LastSeen.Before(cutoff) {
-			delete(c.aircraftMap, hex)
-		} else {
-			// Clean up old track points (keep last 24 hours)
-			validTracks := make([]parser.TrackPoint, 0)
-			for _, point := range aircraft.TrackHistory {
-				if point.Timestamp.After(trackCutoff) {
-					validTracks = append(validTracks, point)
-				}
-			}
-			aircraft.TrackHistory = validTracks
-		}
-	}
-}

internal/config/config.go

@@ -1,118 +0,0 @@
-package config
-
-import (
-	"encoding/json"
-	"fmt"
-	"os"
-	"strconv"
-)
-
-type Config struct {
-	Server   ServerConfig   `json:"server"`
-	Dump1090 Dump1090Config `json:"dump1090"`
-	Origin   OriginConfig   `json:"origin"`
-}
-
-type ServerConfig struct {
-	Address string `json:"address"`
-	Port    int    `json:"port"`
-}
-
-type Dump1090Config struct {
-	Host     string `json:"host"`
-	DataPort int    `json:"data_port"`
-}
-
-type OriginConfig struct {
-	Latitude  float64 `json:"latitude"`
-	Longitude float64 `json:"longitude"`
-	Name      string  `json:"name"`
-}
-
-func Load() (*Config, error) {
-	cfg := &Config{
-		Server: ServerConfig{
-			Address: ":8080",
-			Port:    8080,
-		},
-		Dump1090: Dump1090Config{
-			Host:     "localhost",
-			DataPort: 30003,
-		},
-		Origin: OriginConfig{
-			Latitude:  37.7749,
-			Longitude: -122.4194,
-			Name:      "Default Location",
-		},
-	}
-
-	configFile := os.Getenv("SKYVIEW_CONFIG")
-	if configFile == "" {
-		// Check for config files in common locations
-		candidates := []string{"config.json", "./config.json", "skyview.json"}
-		for _, candidate := range candidates {
-			if _, err := os.Stat(candidate); err == nil {
-				configFile = candidate
-				break
-			}
-		}
-	}
-
-	if configFile != "" {
-		if err := loadFromFile(cfg, configFile); err != nil {
-			return nil, fmt.Errorf("failed to load config file %s: %w", configFile, err)
-		}
-	}
-
-	loadFromEnv(cfg)
-
-	return cfg, nil
-}
-
-func loadFromFile(cfg *Config, filename string) error {
-	data, err := os.ReadFile(filename)
-	if err != nil {
-		return err
-	}
-
-	return json.Unmarshal(data, cfg)
-}
-
-func loadFromEnv(cfg *Config) {
-	if addr := os.Getenv("SKYVIEW_ADDRESS"); addr != "" {
-		cfg.Server.Address = addr
-	}
-
-	if portStr := os.Getenv("SKYVIEW_PORT"); portStr != "" {
-		if port, err := strconv.Atoi(portStr); err == nil {
-			cfg.Server.Port = port
-			cfg.Server.Address = fmt.Sprintf(":%d", port)
-		}
-	}
-
-	if host := os.Getenv("DUMP1090_HOST"); host != "" {
-		cfg.Dump1090.Host = host
-	}
-
-	if dataPortStr := os.Getenv("DUMP1090_DATA_PORT"); dataPortStr != "" {
-		if port, err := strconv.Atoi(dataPortStr); err == nil {
-			cfg.Dump1090.DataPort = port
-		}
-	}
-
-	if latStr := os.Getenv("ORIGIN_LATITUDE"); latStr != "" {
-		if lat, err := strconv.ParseFloat(latStr, 64); err == nil {
-			cfg.Origin.Latitude = lat
-		}
-	}
-
-	if lonStr := os.Getenv("ORIGIN_LONGITUDE"); lonStr != "" {
-		if lon, err := strconv.ParseFloat(lonStr, 64); err == nil {
-			cfg.Origin.Longitude = lon
-		}
-	}
-
-	if name := os.Getenv("ORIGIN_NAME"); name != "" {
-		cfg.Origin.Name = name
-	}
-}

internal/icao/database.go

@@ -0,0 +1,268 @@
+package icao
+
+import (
+	"sort"
+	"strconv"
+)
+
+// Database handles ICAO address to country lookups
+type Database struct {
+	allocations []ICAOAllocation
+}
+
+// ICAOAllocation represents an ICAO address range allocation
+type ICAOAllocation struct {
+	StartAddr   int64
+	EndAddr     int64
+	Country     string
+	CountryCode string
+	Flag        string
+	Description string
+}
+
+// CountryInfo represents country information for an aircraft
+type CountryInfo struct {
+	Country     string `json:"country"`
+	CountryCode string `json:"country_code"`
+	Flag        string `json:"flag"`
+}
+
+// NewDatabase creates a new ICAO database with comprehensive allocation data
+func NewDatabase() (*Database, error) {
+	allocations := getICAOAllocations()
+
+	// Sort allocations by start address for efficient binary search
+	sort.Slice(allocations, func(i, j int) bool {
+		return allocations[i].StartAddr < allocations[j].StartAddr
+	})
+
+	return &Database{allocations: allocations}, nil
+}
+
+// getICAOAllocations returns comprehensive ICAO allocation data based on official aerotransport.org table
+func getICAOAllocations() []ICAOAllocation {
+	// ICAO allocations based on official ICAO 24-bit address allocation table
+	// Source: https://www.aerotransport.org/ (unofficial but comprehensive reference)
+	// Complete coverage of all allocated ICAO 24-bit addresses
+	return []ICAOAllocation{
+		// Africa
+		{0x004000, 0x0043FF, "Zimbabwe", "ZW", "🇿🇼", "Republic of Zimbabwe"},
+		{0x006000, 0x006FFF, "Mozambique", "MZ", "🇲🇿", "Republic of Mozambique"},
+		{0x008000, 0x00FFFF, "South Africa", "ZA", "🇿🇦", "Republic of South Africa"},
+		{0x010000, 0x017FFF, "Egypt", "EG", "🇪🇬", "Arab Republic of Egypt"},
+		{0x018000, 0x01FFFF, "Libya", "LY", "🇱🇾", "State of Libya"},
+		{0x020000, 0x027FFF, "Morocco", "MA", "🇲🇦", "Kingdom of Morocco"},
+		{0x028000, 0x02FFFF, "Tunisia", "TN", "🇹🇳", "Republic of Tunisia"},
+		{0x030000, 0x0303FF, "Botswana", "BW", "🇧🇼", "Republic of Botswana"},
+		{0x032000, 0x032FFF, "Burundi", "BI", "🇧🇮", "Republic of Burundi"},
+		{0x034000, 0x034FFF, "Cameroon", "CM", "🇨🇲", "Republic of Cameroon"},
+		{0x035000, 0x0353FF, "Comoros", "KM", "🇰🇲", "Union of the Comoros"},
+		{0x036000, 0x036FFF, "Congo", "CG", "🇨🇬", "Republic of the Congo"},
+		{0x038000, 0x038FFF, "Côte d'Ivoire", "CI", "🇨🇮", "Republic of Côte d'Ivoire"},
+		{0x03E000, 0x03EFFF, "Gabon", "GA", "🇬🇦", "Gabonese Republic"},
+		{0x040000, 0x040FFF, "Ethiopia", "ET", "🇪🇹", "Federal Democratic Republic of Ethiopia"},
+		{0x042000, 0x042FFF, "Equatorial Guinea", "GQ", "🇬🇶", "Republic of Equatorial Guinea"},
+		{0x044000, 0x044FFF, "Ghana", "GH", "🇬🇭", "Republic of Ghana"},
+		{0x046000, 0x046FFF, "Guinea", "GN", "🇬🇳", "Republic of Guinea"},
+		{0x048000, 0x0483FF, "Guinea-Bissau", "GW", "🇬🇼", "Republic of Guinea-Bissau"},
+		{0x04A000, 0x04A3FF, "Lesotho", "LS", "🇱🇸", "Kingdom of Lesotho"},
+		{0x04C000, 0x04CFFF, "Kenya", "KE", "🇰🇪", "Republic of Kenya"},
+		{0x050000, 0x050FFF, "Liberia", "LR", "🇱🇷", "Republic of Liberia"},
+		{0x054000, 0x054FFF, "Madagascar", "MG", "🇲🇬", "Republic of Madagascar"},
+		{0x058000, 0x058FFF, "Malawi", "MW", "🇲🇼", "Republic of Malawi"},
+		{0x05C000, 0x05CFFF, "Mali", "ML", "🇲🇱", "Republic of Mali"},
+		{0x05E000, 0x05E3FF, "Mauritania", "MR", "🇲🇷", "Islamic Republic of Mauritania"},
+		{0x060000, 0x0603FF, "Mauritius", "MU", "🇲🇺", "Republic of Mauritius"},
+		{0x062000, 0x062FFF, "Niger", "NE", "🇳🇪", "Republic of Niger"},
+		{0x064000, 0x064FFF, "Nigeria", "NG", "🇳🇬", "Federal Republic of Nigeria"},
+		{0x068000, 0x068FFF, "Uganda", "UG", "🇺🇬", "Republic of Uganda"},
+		{0x06C000, 0x06CFFF, "Central African Republic", "CF", "🇨🇫", "Central African Republic"},
+		{0x06E000, 0x06EFFF, "Rwanda", "RW", "🇷🇼", "Republic of Rwanda"},
+		{0x070000, 0x070FFF, "Senegal", "SN", "🇸🇳", "Republic of Senegal"},
+		{0x074000, 0x0743FF, "Seychelles", "SC", "🇸🇨", "Republic of Seychelles"},
+		{0x076000, 0x0763FF, "Sierra Leone", "SL", "🇸🇱", "Republic of Sierra Leone"},
+		{0x078000, 0x078FFF, "Somalia", "SO", "🇸🇴", "Federal Republic of Somalia"},
+		{0x07A000, 0x07A3FF, "Swaziland", "SZ", "🇸🇿", "Kingdom of Swaziland"},
+		{0x07C000, 0x07CFFF, "Sudan", "SD", "🇸🇩", "Republic of Sudan"},
+		{0x080000, 0x080FFF, "Tanzania", "TZ", "🇹🇿", "United Republic of Tanzania"},
+		{0x084000, 0x084FFF, "Chad", "TD", "🇹🇩", "Republic of Chad"},
+		{0x088000, 0x088FFF, "Togo", "TG", "🇹🇬", "Togolese Republic"},
+		{0x08A000, 0x08AFFF, "Zambia", "ZM", "🇿🇲", "Republic of Zambia"},
+		{0x08C000, 0x08CFFF, "D R Congo", "CD", "🇨🇩", "Democratic Republic of the Congo"},
+		{0x090000, 0x090FFF, "Angola", "AO", "🇦🇴", "Republic of Angola"},
+		{0x094000, 0x0943FF, "Benin", "BJ", "🇧🇯", "Republic of Benin"},
+		{0x096000, 0x0963FF, "Cape Verde", "CV", "🇨🇻", "Republic of Cape Verde"},
+		{0x098000, 0x0983FF, "Djibouti", "DJ", "🇩🇯", "Republic of Djibouti"},
+		{0x0A8000, 0x0A8FFF, "Bahamas", "BS", "🇧🇸", "Commonwealth of the Bahamas"},
+		{0x0AA000, 0x0AA3FF, "Barbados", "BB", "🇧🇧", "Barbados"},
+		{0x0AB000, 0x0AB3FF, "Belize", "BZ", "🇧🇿", "Belize"},
+		{0x0B0000, 0x0B0FFF, "Cuba", "CU", "🇨🇺", "Republic of Cuba"},
+		{0x0B2000, 0x0B2FFF, "El Salvador", "SV", "🇸🇻", "Republic of El Salvador"},
+		{0x0B8000, 0x0B8FFF, "Haiti", "HT", "🇭🇹", "Republic of Haiti"},
+		{0x0BA000, 0x0BAFFF, "Honduras", "HN", "🇭🇳", "Republic of Honduras"},
+		{0x0BC000, 0x0BC3FF, "St. Vincent + Grenadines", "VC", "🇻🇨", "Saint Vincent and the Grenadines"},
+		{0x0BE000, 0x0BEFFF, "Jamaica", "JM", "🇯🇲", "Jamaica"},
+		{0x0D0000, 0x0D7FFF, "Mexico", "MX", "🇲🇽", "United Mexican States"},
+
+		// Eastern Europe & Russia
+		{0x100000, 0x1FFFFF, "Russia", "RU", "🇷🇺", "Russian Federation"},
+		{0x201000, 0x2013FF, "Namibia", "NA", "🇳🇦", "Republic of Namibia"},
+		{0x202000, 0x2023FF, "Eritrea", "ER", "🇪🇷", "State of Eritrea"},
+
+		// Europe
+		{0x300000, 0x33FFFF, "Italy", "IT", "🇮🇹", "Italian Republic"},
+		{0x340000, 0x37FFFF, "Spain", "ES", "🇪🇸", "Kingdom of Spain"},
+		{0x380000, 0x3BFFFF, "France", "FR", "🇫🇷", "French Republic"},
+		{0x3C0000, 0x3FFFFF, "Germany", "DE", "🇩🇪", "Federal Republic of Germany"},
+		{0x400000, 0x43FFFF, "United Kingdom", "GB", "🇬🇧", "United Kingdom"},
+		{0x440000, 0x447FFF, "Austria", "AT", "🇦🇹", "Republic of Austria"},
+		{0x448000, 0x44FFFF, "Belgium", "BE", "🇧🇪", "Kingdom of Belgium"},
+		{0x450000, 0x457FFF, "Bulgaria", "BG", "🇧🇬", "Republic of Bulgaria"},
+		{0x458000, 0x45FFFF, "Denmark", "DK", "🇩🇰", "Kingdom of Denmark"},
+		{0x460000, 0x467FFF, "Finland", "FI", "🇫🇮", "Republic of Finland"},
+		{0x468000, 0x46FFFF, "Greece", "GR", "🇬🇷", "Hellenic Republic"},
+		{0x470000, 0x477FFF, "Hungary", "HU", "🇭🇺", "Republic of Hungary"},
+		{0x478000, 0x47FFFF, "Norway", "NO", "🇳🇴", "Kingdom of Norway"},
+		{0x480000, 0x487FFF, "Netherlands", "NL", "🇳🇱", "Kingdom of the Netherlands"},
+		{0x488000, 0x48FFFF, "Poland", "PL", "🇵🇱", "Republic of Poland"},
+		{0x490000, 0x497FFF, "Portugal", "PT", "🇵🇹", "Portuguese Republic"},
+		{0x498000, 0x49FFFF, "Czech Republic", "CZ", "🇨🇿", "Czech Republic"},
+		{0x4A0000, 0x4A7FFF, "Romania", "RO", "🇷🇴", "Romania"},
+		{0x4A8000, 0x4AFFFF, "Sweden", "SE", "🇸🇪", "Kingdom of Sweden"},
+		{0x4B0000, 0x4B7FFF, "Switzerland", "CH", "🇨🇭", "Swiss Confederation"},
+		{0x4B8000, 0x4BFFFF, "Turkey", "TR", "🇹🇷", "Republic of Turkey"},
+		{0x4C0000, 0x4C7FFF, "Yugoslavia", "YU", "🇷🇸", "Yugoslavia"},
+		{0x4C8000, 0x4C83FF, "Cyprus", "CY", "🇨🇾", "Republic of Cyprus"},
+		{0x4CA000, 0x4CAFFF, "Ireland", "IE", "🇮🇪", "Republic of Ireland"},
+		{0x4CC000, 0x4CCFFF, "Iceland", "IS", "🇮🇸", "Republic of Iceland"},
+		{0x4D0000, 0x4D03FF, "Luxembourg", "LU", "🇱🇺", "Grand Duchy of Luxembourg"},
+		{0x4D2000, 0x4D23FF, "Malta", "MT", "🇲🇹", "Republic of Malta"},
+		{0x4D4000, 0x4D43FF, "Monaco", "MC", "🇲🇨", "Principality of Monaco"},
+		{0x500000, 0x5004FF, "San Marino", "SM", "🇸🇲", "Republic of San Marino"},
+		{0x501000, 0x5013FF, "Albania", "AL", "🇦🇱", "Republic of Albania"},
+		{0x501C00, 0x501FFF, "Croatia", "HR", "🇭🇷", "Republic of Croatia"},
+		{0x502C00, 0x502FFF, "Latvia", "LV", "🇱🇻", "Republic of Latvia"},
+		{0x503C00, 0x503FFF, "Lithuania", "LT", "🇱🇹", "Republic of Lithuania"},
+		{0x504C00, 0x504FFF, "Moldova", "MD", "🇲🇩", "Republic of Moldova"},
+		{0x505C00, 0x505FFF, "Slovakia", "SK", "🇸🇰", "Slovak Republic"},
+		{0x506C00, 0x506FFF, "Slovenia", "SI", "🇸🇮", "Republic of Slovenia"},
+		{0x508000, 0x50FFFF, "Ukraine", "UA", "🇺🇦", "Ukraine"},
+		{0x510000, 0x5103FF, "Belarus", "BY", "🇧🇾", "Republic of Belarus"},
+		{0x511000, 0x5113FF, "Estonia", "EE", "🇪🇪", "Republic of Estonia"},
+		{0x512000, 0x5123FF, "Macedonia", "MK", "🇲🇰", "North Macedonia"},
+		{0x513000, 0x5133FF, "Bosnia & Herzegovina", "BA", "🇧🇦", "Bosnia and Herzegovina"},
+		{0x514000, 0x5143FF, "Georgia", "GE", "🇬🇪", "Georgia"},
+
+		// Middle East & Central Asia
+		{0x600000, 0x6003FF, "Armenia", "AM", "🇦🇲", "Republic of Armenia"},
+		{0x600800, 0x600BFF, "Azerbaijan", "AZ", "🇦🇿", "Republic of Azerbaijan"},
+		{0x680000, 0x6803FF, "Bhutan", "BT", "🇧🇹", "Kingdom of Bhutan"},
+		{0x681000, 0x6813FF, "Micronesia", "FM", "🇫🇲", "Federated States of Micronesia"},
+		{0x682000, 0x6823FF, "Mongolia", "MN", "🇲🇳", "Mongolia"},
+		{0x683000, 0x6833FF, "Kazakhstan", "KZ", "🇰🇿", "Republic of Kazakhstan"},
+		{0x06A000, 0x06A3FF, "Qatar", "QA", "🇶🇦", "State of Qatar"},
+		{0x700000, 0x700FFF, "Afghanistan", "AF", "🇦🇫", "Islamic Republic of Afghanistan"},
+		{0x702000, 0x702FFF, "Bangladesh", "BD", "🇧🇩", "People's Republic of Bangladesh"},
+		{0x704000, 0x704FFF, "Myanmar", "MM", "🇲🇲", "Republic of the Union of Myanmar"},
+		{0x706000, 0x706FFF, "Kuwait", "KW", "🇰🇼", "State of Kuwait"},
+		{0x708000, 0x708FFF, "Laos", "LA", "🇱🇦", "Lao People's Democratic Republic"},
+		{0x70A000, 0x70AFFF, "Nepal", "NP", "🇳🇵", "Federal Democratic Republic of Nepal"},
+		{0x70C000, 0x70C3FF, "Oman", "OM", "🇴🇲", "Sultanate of Oman"},
+		{0x70E000, 0x70EFFF, "Cambodia", "KH", "🇰🇭", "Kingdom of Cambodia"},
+		{0x710000, 0x717FFF, "Saudi Arabia", "SA", "🇸🇦", "Kingdom of Saudi Arabia"},
+		{0x718000, 0x71FFFF, "South Korea", "KR", "🇰🇷", "Republic of Korea"},
+		{0x720000, 0x727FFF, "North Korea", "KP", "🇰🇵", "Democratic People's Republic of Korea"},
+		{0x728000, 0x72FFFF, "Iraq", "IQ", "🇮🇶", "Republic of Iraq"},
+		{0x730000, 0x737FFF, "Iran", "IR", "🇮🇷", "Islamic Republic of Iran"},
+		{0x738000, 0x73FFFF, "Israel", "IL", "🇮🇱", "State of Israel"},
+		{0x740000, 0x747FFF, "Jordan", "JO", "🇯🇴", "Hashemite Kingdom of Jordan"},
+		{0x750000, 0x757FFF, "Malaysia", "MY", "🇲🇾", "Malaysia"},
+		{0x758000, 0x75FFFF, "Philippines", "PH", "🇵🇭", "Republic of the Philippines"},
+		{0x760000, 0x767FFF, "Pakistan", "PK", "🇵🇰", "Islamic Republic of Pakistan"},
+		{0x768000, 0x76FFFF, "Singapore", "SG", "🇸🇬", "Republic of Singapore"},
+		{0x770000, 0x777FFF, "Sri Lanka", "LK", "🇱🇰", "Democratic Socialist Republic of Sri Lanka"},
+		{0x778000, 0x77FFFF, "Syria", "SY", "🇸🇾", "Syrian Arab Republic"},
+		{0x780000, 0x7BFFFF, "China", "CN", "🇨🇳", "People's Republic of China"},
+		{0x7C0000, 0x7FFFFF, "Australia", "AU", "🇦🇺", "Commonwealth of Australia"},
+
+		// Asia-Pacific
+		{0x800000, 0x83FFFF, "India", "IN", "🇮🇳", "Republic of India"},
+		{0x840000, 0x87FFFF, "Japan", "JP", "🇯🇵", "Japan"},
+		{0x880000, 0x887FFF, "Thailand", "TH", "🇹🇭", "Kingdom of Thailand"},
+		{0x888000, 0x88FFFF, "Vietnam", "VN", "🇻🇳", "Socialist Republic of Vietnam"},
+		{0x890000, 0x890FFF, "Yemen", "YE", "🇾🇪", "Republic of Yemen"},
+		{0x894000, 0x894FFF, "Bahrain", "BH", "🇧🇭", "Kingdom of Bahrain"},
+		{0x895000, 0x8953FF, "Brunei", "BN", "🇧🇳", "Nation of Brunei"},
+		{0x896000, 0x8973FF, "United Arab Emirates", "AE", "🇦🇪", "United Arab Emirates"},
+		{0x897000, 0x8973FF, "Solomon Islands", "SB", "🇸🇧", "Solomon Islands"},
+		{0x898000, 0x898FFF, "Papua New Guinea", "PG", "🇵🇬", "Independent State of Papua New Guinea"},
+		{0x899000, 0x8993FF, "Taiwan", "TW", "🇹🇼", "Republic of China (Taiwan)"},
+		{0x8A0000, 0x8A7FFF, "Indonesia", "ID", "🇮🇩", "Republic of Indonesia"},
+
+		// North America
+		{0xA00000, 0xAFFFFF, "United States", "US", "🇺🇸", "United States of America"},
+
+		// North America & Oceania
+		{0xC00000, 0xC3FFFF, "Canada", "CA", "🇨🇦", "Canada"},
+		{0xC80000, 0xC87FFF, "New Zealand", "NZ", "🇳🇿", "New Zealand"},
+		{0xC88000, 0xC88FFF, "Fiji", "FJ", "🇫🇯", "Republic of Fiji"},
+		{0xC8A000, 0xC8A3FF, "Nauru", "NR", "🇳🇷", "Republic of Nauru"},
+		{0xC8C000, 0xC8C3FF, "Saint Lucia", "LC", "🇱🇨", "Saint Lucia"},
+		{0xC8D000, 0xC8D3FF, "Tonga", "TO", "🇹🇴", "Kingdom of Tonga"},
+		{0xC8E000, 0xC8E3FF, "Kiribati", "KI", "🇰🇮", "Republic of Kiribati"},
+
+		// South America
+		{0xE00000, 0xE3FFFF, "Argentina", "AR", "🇦🇷", "Argentine Republic"},
+		{0xE40000, 0xE7FFFF, "Brazil", "BR", "🇧🇷", "Federative Republic of Brazil"},
+		{0xE80000, 0xE80FFF, "Chile", "CL", "🇨🇱", "Republic of Chile"},
+		{0xE84000, 0xE84FFF, "Ecuador", "EC", "🇪🇨", "Republic of Ecuador"},
+		{0xE88000, 0xE88FFF, "Paraguay", "PY", "🇵🇾", "Republic of Paraguay"},
+		{0xE8C000, 0xE8CFFF, "Peru", "PE", "🇵🇪", "Republic of Peru"},
+		{0xE90000, 0xE90FFF, "Uruguay", "UY", "🇺🇾", "Oriental Republic of Uruguay"},
+		{0xE94000, 0xE94FFF, "Bolivia", "BO", "🇧🇴", "Plurinational State of Bolivia"},
+	}
+}
+
+// LookupCountry returns country information for an ICAO address using binary search
+func (d *Database) LookupCountry(icaoHex string) (*CountryInfo, error) {
+	if len(icaoHex) != 6 {
+		return &CountryInfo{
+			Country:     "Unknown",
+			CountryCode: "XX",
+			Flag:        "🏳️",
+		}, nil
+	}
+
+	// Convert hex string to integer
+	icaoInt, err := strconv.ParseInt(icaoHex, 16, 64)
+	if err != nil {
+		return &CountryInfo{
+			Country:     "Unknown",
+			CountryCode: "XX",
+			Flag:        "🏳️",
+		}, nil
+	}
+
+	// Binary search for the ICAO address range
+	for _, alloc := range d.allocations {
+		if icaoInt >= alloc.StartAddr && icaoInt <= alloc.EndAddr {
+			return &CountryInfo{
+				Country:     alloc.Country,
+				CountryCode: alloc.CountryCode,
+				Flag:        alloc.Flag,
+			}, nil
+		}
+	}
+
+	// Not found in any allocation
+	return &CountryInfo{
+		Country:     "Unknown",
+		CountryCode: "XX",
+		Flag:        "🏳️",
+	}, nil
+}
+
+// Close is a no-op since we don't have any resources to clean up
+func (d *Database) Close() error {
+	return nil
+}

internal/parser/sbs1.go

@@ -1,225 +0,0 @@
-package parser
-
-import (
-	"strconv"
-	"strings"
-	"time"
-)
-
-type TrackPoint struct {
-	Timestamp time.Time `json:"timestamp"`
-	Latitude  float64   `json:"lat"`
-	Longitude float64   `json:"lon"`
-	Altitude  int       `json:"altitude"`
-	Speed     int       `json:"speed"`
-	Track     int       `json:"track"`
-}
-
-type Aircraft struct {
-	Hex         string       `json:"hex"`
-	Flight      string       `json:"flight,omitempty"`
-	Altitude    int          `json:"alt_baro,omitempty"`
-	GroundSpeed int          `json:"gs,omitempty"`
-	Track       int          `json:"track,omitempty"`
-	Latitude    float64      `json:"lat,omitempty"`
-	Longitude   float64      `json:"lon,omitempty"`
-	VertRate    int          `json:"vert_rate,omitempty"`
-	Squawk      string       `json:"squawk,omitempty"`
-	Emergency   bool         `json:"emergency,omitempty"`
-	OnGround    bool         `json:"on_ground,omitempty"`
-	LastSeen    time.Time    `json:"last_seen"`
-	Messages    int          `json:"messages"`
-	TrackHistory []TrackPoint `json:"track_history,omitempty"`
-	RSSI        float64      `json:"rssi,omitempty"`
-	Country     string       `json:"country,omitempty"`
-	Registration string      `json:"registration,omitempty"`
-}
-
-type AircraftData struct {
-	Now      int64               `json:"now"`
-	Messages int                 `json:"messages"`
-	Aircraft map[string]Aircraft `json:"aircraft"`
-}
-
-func ParseSBS1Line(line string) (*Aircraft, error) {
-	parts := strings.Split(strings.TrimSpace(line), ",")
-	if len(parts) < 22 {
-		return nil, nil
-	}
-
-	// messageType := parts[1]
-	// Accept all message types to get complete data
-	// MSG types: 1=ES_IDENT_AND_CATEGORY, 2=ES_SURFACE_POS, 3=ES_AIRBORNE_POS
-	// 4=ES_AIRBORNE_VEL, 5=SURVEILLANCE_ALT, 6=SURVEILLANCE_ID, 7=AIR_TO_AIR, 8=ALL_CALL_REPLY
-
-	aircraft := &Aircraft{
-		Hex:      strings.TrimSpace(parts[4]),
-		LastSeen: time.Now(),
-		Messages: 1,
-	}
-
-	// Different message types contain different fields
-	// Always try to extract what's available
-	if parts[10] != "" {
-		aircraft.Flight = strings.TrimSpace(parts[10])
-	}
-
-	if parts[11] != "" {
-		if alt, err := strconv.Atoi(parts[11]); err == nil {
-			aircraft.Altitude = alt
-		}
-	}
-
-	if parts[12] != "" {
-		if gs, err := strconv.Atoi(parts[12]); err == nil {
-			aircraft.GroundSpeed = gs
-		}
-	}
-
-	if parts[13] != "" {
-		if track, err := strconv.ParseFloat(parts[13], 64); err == nil {
-			aircraft.Track = int(track)
-		}
-	}
-
-	if parts[14] != "" && parts[15] != "" {
-		if lat, err := strconv.ParseFloat(parts[14], 64); err == nil {
-			aircraft.Latitude = lat
-		}
-		if lon, err := strconv.ParseFloat(parts[15], 64); err == nil {
-			aircraft.Longitude = lon
-		}
-	}
-
-	if parts[16] != "" {
-		if vr, err := strconv.Atoi(parts[16]); err == nil {
-			aircraft.VertRate = vr
-		}
-	}
-
-	if parts[17] != "" {
-		aircraft.Squawk = strings.TrimSpace(parts[17])
-	}
-
-	if parts[21] != "" {
-		aircraft.OnGround = parts[21] == "1"
-	}
-
-	aircraft.Country = getCountryFromICAO(aircraft.Hex)
-	aircraft.Registration = getRegistrationFromICAO(aircraft.Hex)
-
-	return aircraft, nil
-}
-
-func getCountryFromICAO(icao string) string {
-	if len(icao) < 6 {
-		return "Unknown"
-	}
-
-	prefix := icao[:1]
-	
-	switch prefix {
-	case "4":
-		return getCountryFrom4xxxx(icao)
-	case "A":
-		return "United States"
-	case "C":
-		return "Canada"
-	case "D":
-		return "Germany"
-	case "F":
-		return "France"
-	case "G":
-		return "United Kingdom"
-	case "I":
-		return "Italy"
-	case "J":
-		return "Japan"
-	case "P":
-		return getPCountry(icao)
-	case "S":
-		return getSCountry(icao)
-	case "O":
-		return getOCountry(icao)
-	default:
-		return "Unknown"
-	}
-}
-
-func getCountryFrom4xxxx(icao string) string {
-	if len(icao) >= 2 {
-		switch icao[:2] {
-		case "40":
-			return "United Kingdom"
-		case "44":
-			return "Austria"
-		case "45":
-			return "Denmark"
-		case "46":
-			return "Germany"
-		case "47":
-			return "Germany"
-		case "48":
-			return "Netherlands"
-		case "49":
-			return "Netherlands"
-		}
-	}
-	return "Europe"
-}
-
-func getPCountry(icao string) string {
-	if len(icao) >= 2 {
-		switch icao[:2] {
-		case "PH":
-			return "Netherlands"
-		case "PJ":
-			return "Netherlands Antilles"
-		}
-	}
-	return "Unknown"
-}
-
-func getSCountry(icao string) string {
-	if len(icao) >= 2 {
-		switch icao[:2] {
-		case "SE":
-			return "Sweden"
-		case "SX":
-			return "Greece"
-		}
-	}
-	return "Unknown"
-}
-
-func getOCountry(icao string) string {
-	if len(icao) >= 2 {
-		switch icao[:2] {
-		case "OO":
-			return "Belgium"
-		case "OH":
-			return "Finland"
-		}
-	}
-	return "Unknown"
-}
-
-func getRegistrationFromICAO(icao string) string {
-	// This is a simplified conversion - real registration lookup would need a database
-	country := getCountryFromICAO(icao)
-	switch country {
-	case "Germany":
-		return "D-" + icao[2:]
-	case "United Kingdom":
-		return "G-" + icao[2:]
-	case "France":
-		return "F-" + icao[2:]
-	case "Netherlands":
-		return "PH-" + icao[2:]
-	case "Sweden":
-		return "SE-" + icao[2:]
-	default:
-		return icao
-	}
-}
-

internal/server/server_test.go

@@ -1,55 +0,0 @@
-package server
-
-import (
-	"embed"
-	"net/http"
-	"net/http/httptest"
-	"testing"
-
-	"skyview/internal/config"
-)
-
-//go:embed testdata/*
-var testStaticFiles embed.FS
-
-func TestNew(t *testing.T) {
-	cfg := &config.Config{
-		Server: config.ServerConfig{
-			Address: ":8080",
-			Port:    8080,
-		},
-		Dump1090: config.Dump1090Config{
-			Host: "localhost",
-			Port: 8080,
-			URL:  "http://localhost:8080",
-		},
-	}
-
-	handler := New(cfg, testStaticFiles)
-	if handler == nil {
-		t.Fatal("Expected handler to be created")
-	}
-}
-
-func TestCORSHeaders(t *testing.T) {
-	cfg := &config.Config{
-		Dump1090: config.Dump1090Config{
-			URL: "http://localhost:8080",
-		},
-	}
-
-	handler := New(cfg, testStaticFiles)
-	
-	req := httptest.NewRequest("OPTIONS", "/api/aircraft", nil)
-	w := httptest.NewRecorder()
-	
-	handler.ServeHTTP(w, req)
-	
-	if w.Header().Get("Access-Control-Allow-Origin") != "*" {
-		t.Errorf("Expected CORS header, got %s", w.Header().Get("Access-Control-Allow-Origin"))
-	}
-	
-	if w.Code != http.StatusOK {
-		t.Errorf("Expected status 200, got %d", w.Code)
-	}
-}

main.go

@@ -1,69 +0,0 @@
-package main
-
-import (
-	"context"
-	"embed"
-	"flag"
-	"log"
-	"net/http"
-	"os"
-	"os/signal"
-	"syscall"
-	"time"
-
-	"skyview/internal/config"
-	"skyview/internal/server"
-)
-
-//go:embed static/*
-var staticFiles embed.FS
-
-func main() {
-	daemon := flag.Bool("daemon", false, "Run as daemon (background process)")
-	flag.Parse()
-
-	cfg, err := config.Load()
-	if err != nil {
-		log.Fatalf("Failed to load configuration: %v", err)
-	}
-
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-
-	srv := server.New(cfg, staticFiles, ctx)
-
-	log.Printf("Starting skyview server on %s", cfg.Server.Address)
-	log.Printf("Connecting to dump1090 SBS-1 at %s:%d", cfg.Dump1090.Host, cfg.Dump1090.DataPort)
-
-	httpServer := &http.Server{
-		Addr:    cfg.Server.Address,
-		Handler: srv,
-	}
-
-	go func() {
-		if err := httpServer.ListenAndServe(); err != nil && err != http.ErrServerClosed {
-			log.Fatalf("Server failed to start: %v", err)
-		}
-	}()
-
-	if *daemon {
-		log.Printf("Running as daemon...")
-		select {}
-	} else {
-		log.Printf("Press Ctrl+C to stop")
-		
-		sigChan := make(chan os.Signal, 1)
-		signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)
-		<-sigChan
-		
-		log.Printf("Shutting down...")
-		cancel()
-		
-		shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), 5*time.Second)
-		defer shutdownCancel()
-		
-		if err := httpServer.Shutdown(shutdownCtx); err != nil {
-			log.Printf("Server shutdown error: %v", err)
-		}
-	}
-}

scripts/build-deb.sh

@@ -0,0 +1,111 @@
+#!/bin/bash
+set -e
+
+# Build script for creating Debian package
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
+BUILD_DIR="$PROJECT_DIR/build"
+DEB_DIR="$PROJECT_DIR/debian"
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m' # No Color
+
+echo_info() {
+    echo -e "${GREEN}[INFO]${NC} $1"
+}
+
+echo_warn() {
+    echo -e "${YELLOW}[WARN]${NC} $1"
+}
+
+echo_error() {
+    echo -e "${RED}[ERROR]${NC} $1"
+}
+
+# Clean previous builds
+echo_info "Cleaning previous builds..."
+rm -rf "$BUILD_DIR"
+mkdir -p "$BUILD_DIR"
+
+# Change to project directory
+cd "$PROJECT_DIR"
+
+# Build the applications
+echo_info "Building SkyView applications..."
+export CGO_ENABLED=0
+export GOOS=linux
+export GOARCH=amd64
+
+VERSION=$(git describe --tags --always --dirty)
+LDFLAGS="-w -s -X main.version=$VERSION"
+
+# Build main skyview binary
+echo_info "Building skyview..."
+if ! go build -ldflags="$LDFLAGS" \
+    -o "$DEB_DIR/usr/bin/skyview" \
+    ./cmd/skyview; then
+    echo_error "Failed to build skyview"
+    exit 1
+fi
+
+# Build beast-dump utility
+echo_info "Building beast-dump..."
+if ! go build -ldflags="$LDFLAGS" \
+    -o "$DEB_DIR/usr/bin/beast-dump" \
+    ./cmd/beast-dump; then
+    echo_error "Failed to build beast-dump"
+    exit 1
+fi
+
+echo_info "Built binaries:"
+echo_info "  skyview: $(file "$DEB_DIR/usr/bin/skyview")"
+echo_info "  beast-dump: $(file "$DEB_DIR/usr/bin/beast-dump")"
+
+# Set executable permissions
+chmod +x "$DEB_DIR/usr/bin/skyview"
+chmod +x "$DEB_DIR/usr/bin/beast-dump"
+
+# Get package info
+VERSION=$(grep "Version:" "$DEB_DIR/DEBIAN/control" | cut -d' ' -f2)
+PACKAGE=$(grep "Package:" "$DEB_DIR/DEBIAN/control" | cut -d' ' -f2)
+ARCH=$(grep "Architecture:" "$DEB_DIR/DEBIAN/control" | cut -d' ' -f2)
+
+DEB_FILE="${PACKAGE}_${VERSION}_${ARCH}.deb"
+
+echo_info "Creating Debian package: $DEB_FILE"
+
+# Calculate installed size
+INSTALLED_SIZE=$(du -sk "$DEB_DIR" | cut -f1)
+sed -i "s/Installed-Size:.*/Installed-Size: $INSTALLED_SIZE/" "$DEB_DIR/DEBIAN/control" 2>/dev/null || \
+    echo "Installed-Size: $INSTALLED_SIZE" >> "$DEB_DIR/DEBIAN/control"
+
+# Build the package
+if dpkg-deb --root-owner-group --build "$DEB_DIR" "$BUILD_DIR/$DEB_FILE"; then
+    echo_info "Successfully created: $BUILD_DIR/$DEB_FILE"
+    
+    # Show package info
+    echo_info "Package information:"
+    dpkg-deb --info "$BUILD_DIR/$DEB_FILE"
+    
+    echo_info "Package contents:"
+    dpkg-deb --contents "$BUILD_DIR/$DEB_FILE"
+    
+    # Test the package (requires root)
+    if [ "$EUID" -eq 0 ]; then
+        echo_info "Testing package installation (as root)..."
+        dpkg --dry-run -i "$BUILD_DIR/$DEB_FILE"
+    else
+        echo_warn "Run as root to test package installation"
+    fi
+    
+    echo_info "Debian package build complete!"
+    echo_info "Install with: sudo dpkg -i $BUILD_DIR/$DEB_FILE"
+    echo_info "Or upload to repository for apt installation"
+else
+    echo_error "Failed to create Debian package"
+    exit 1
+fi

static/aircraft-icon.svg

@@ -1,5 +0,0 @@
-<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="#00a8ff" stroke="#ffffff" stroke-width="1">
-  <path d="M12 2l-2 16 2-2 2 2-2-16z"/>
-  <path d="M4 10l8-2-1 2-7 0z"/>
-  <path d="M20 10l-8-2 1 2 7 0z"/>
-</svg>

static/index.html

@@ -1,152 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-<head>
-    <meta charset="UTF-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>SkyView - ADS-B Aircraft Tracker</title>
-    <link rel="icon" type="image/x-icon" href="/favicon.ico">
-    <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.4/dist/leaflet.css" />
-    <link rel="stylesheet" href="/static/css/style.css">
-</head>
-<body>
-    <div id="app">
-        <header class="header">
-            <h1>SkyView</h1>
-            <div class="clock-section">
-                <div class="clock-display">
-                    <div class="clock" id="utc-clock">
-                        <div class="clock-face">
-                            <div class="clock-hand hour-hand" id="utc-hour"></div>
-                            <div class="clock-hand minute-hand" id="utc-minute"></div>
-                        </div>
-                        <div class="clock-label">UTC</div>
-                    </div>
-                    <div class="clock" id="update-clock">
-                        <div class="clock-face">
-                            <div class="clock-hand hour-hand" id="update-hour"></div>
-                            <div class="clock-hand minute-hand" id="update-minute"></div>
-                        </div>
-                        <div class="clock-label">Last Update</div>
-                    </div>
-                </div>
-            </div>
-            <div class="stats-summary">
-                <span id="aircraft-count">0 aircraft</span>
-                <span id="connection-status" class="connected">Connected</span>
-            </div>
-        </header>
-
-        <main class="main-content">
-            <div class="view-toggle">
-                <button id="map-view-btn" class="view-btn active">Map</button>
-                <button id="table-view-btn" class="view-btn">Table</button>
-                <button id="stats-view-btn" class="view-btn">Stats</button>
-            </div>
-
-            <div id="map-view" class="view active">
-                <div id="map"></div>
-                <div class="map-controls">
-                    <button id="center-map">Center Map</button>
-                    <button id="toggle-trails">Toggle Trails</button>
-                    <button id="toggle-history">Show History</button>
-                </div>
-                
-                <div class="legend">
-                    <h4>Aircraft Types</h4>
-                    <div class="legend-item">
-                        <span class="legend-icon commercial"></span>
-                        <span>Commercial</span>
-                    </div>
-                    <div class="legend-item">
-                        <span class="legend-icon cargo"></span>
-                        <span>Cargo</span>
-                    </div>
-                    <div class="legend-item">
-                        <span class="legend-icon military"></span>
-                        <span>Military</span>
-                    </div>
-                    <div class="legend-item">
-                        <span class="legend-icon ga"></span>
-                        <span>General Aviation</span>
-                    </div>
-                    <div class="legend-item">
-                        <span class="legend-icon ground"></span>
-                        <span>Ground</span>
-                    </div>
-                </div>
-            </div>
-
-            <div id="table-view" class="view">
-                <div class="table-controls">
-                    <input type="text" id="search-input" placeholder="Search by flight, ICAO, or squawk...">
-                    <select id="sort-select">
-                        <option value="distance">Distance</option>
-                        <option value="altitude">Altitude</option>
-                        <option value="speed">Speed</option>
-                        <option value="flight">Flight</option>
-                        <option value="icao">ICAO</option>
-                        <option value="squawk">Squawk</option>
-                        <option value="age">Age</option>
-                        <option value="rssi">RSSI</option>
-                    </select>
-                </div>
-                <div class="table-container">
-                    <table id="aircraft-table">
-                        <thead>
-                            <tr>
-                                <th>ICAO</th>
-                                <th>Flight</th>
-                                <th>Squawk</th>
-                                <th>Altitude</th>
-                                <th>Speed</th>
-                                <th>Distance</th>
-                                <th>Track</th>
-                                <th>Msgs</th>
-                                <th>Age</th>
-                                <th>RSSI</th>
-                            </tr>
-                        </thead>
-                        <tbody id="aircraft-tbody">
-                        </tbody>
-                    </table>
-                </div>
-            </div>
-
-            <div id="stats-view" class="view">
-                <div class="stats-grid">
-                    <div class="stat-card">
-                        <h3>Total Aircraft</h3>
-                        <div class="stat-value" id="total-aircraft">0</div>
-                    </div>
-                    <div class="stat-card">
-                        <h3>Messages/sec</h3>
-                        <div class="stat-value" id="messages-sec">0</div>
-                    </div>
-                    <div class="stat-card">
-                        <h3>Avg RSSI</h3>
-                        <div class="stat-value" id="signal-strength">0 dBFS</div>
-                    </div>
-                    <div class="stat-card">
-                        <h3>Max Range</h3>
-                        <div class="stat-value" id="max-range">0 nm</div>
-                    </div>
-                </div>
-                <div class="charts-container">
-                    <div class="chart-card">
-                        <h3>Aircraft Count (24h)</h3>
-                        <canvas id="aircraft-chart"></canvas>
-                    </div>
-                    <div class="chart-card">
-                        <h3>Message Rate</h3>
-                        <canvas id="message-chart"></canvas>
-                    </div>
-                </div>
-            </div>
-        </main>
-    </div>
-
-    <script src="https://unpkg.com/leaflet@1.9.4/dist/leaflet.js"></script>
-    <script src="https://cdn.jsdelivr.net/npm/chart.js@4.4.0/dist/chart.umd.js"></script>
-    <script src="/static/js/app.js"></script>
-</body>
-</html>

static/js/app.js

@@ -1,832 +0,0 @@
-class SkyView {
-    constructor() {
-        this.map = null;
-        this.aircraftMarkers = new Map();
-        this.aircraftTrails = new Map();
-        this.historicalTracks = new Map();
-        this.websocket = null;
-        this.aircraftData = [];
-        this.showTrails = false;
-        this.showHistoricalTracks = false;
-        this.currentView = 'map';
-        this.charts = {};
-        this.origin = { latitude: 37.7749, longitude: -122.4194, name: 'Default' };
-        this.lastUpdateTime = new Date();
-        
-        this.init();
-    }
-
-    init() {
-        this.loadConfig().then(() => {
-            this.initializeViews();
-            this.initializeMap();
-            this.initializeWebSocket();
-            this.initializeEventListeners();
-            this.initializeCharts();
-            this.initializeClocks();
-            
-            this.startPeriodicUpdates();
-        });
-    }
-
-    async loadConfig() {
-        try {
-            const response = await fetch('/api/config');
-            const config = await response.json();
-            if (config.origin) {
-                this.origin = config.origin;
-            }
-        } catch (error) {
-            console.warn('Failed to load config, using defaults:', error);
-        }
-    }
-
-    initializeViews() {
-        const viewButtons = document.querySelectorAll('.view-btn');
-        const views = document.querySelectorAll('.view');
-
-        viewButtons.forEach(btn => {
-            btn.addEventListener('click', () => {
-                const viewId = btn.id.replace('-btn', '');
-                this.switchView(viewId);
-                
-                viewButtons.forEach(b => b.classList.remove('active'));
-                btn.classList.add('active');
-                
-                views.forEach(v => v.classList.remove('active'));
-                document.getElementById(viewId).classList.add('active');
-            });
-        });
-    }
-
-    switchView(view) {
-        this.currentView = view;
-        if (view === 'map' && this.map) {
-            setTimeout(() => this.map.invalidateSize(), 100);
-        }
-    }
-
-    initializeMap() {
-        this.map = L.map('map', {
-            center: [this.origin.latitude, this.origin.longitude],
-            zoom: 8,
-            zoomControl: true
-        });
-
-        L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
-            attribution: '© OpenStreetMap contributors'
-        }).addTo(this.map);
-
-        L.marker([this.origin.latitude, this.origin.longitude], {
-            icon: L.divIcon({
-                html: '<div style="background: #e74c3c; width: 12px; height: 12px; border-radius: 50%; border: 2px solid white;"></div>',
-                className: 'origin-marker',
-                iconSize: [16, 16],
-                iconAnchor: [8, 8]
-            })
-        }).addTo(this.map).bindPopup(`<b>Origin</b><br>${this.origin.name}`);
-
-        L.circle([this.origin.latitude, this.origin.longitude], {
-            radius: 185200,
-            fillColor: 'transparent',
-            color: '#404040',
-            weight: 1,
-            opacity: 0.5
-        }).addTo(this.map);
-
-        const centerBtn = document.getElementById('center-map');
-        centerBtn.addEventListener('click', () => this.centerMapOnAircraft());
-
-        const trailsBtn = document.getElementById('toggle-trails');
-        trailsBtn.addEventListener('click', () => this.toggleTrails());
-        
-        const historyBtn = document.getElementById('toggle-history');
-        historyBtn.addEventListener('click', () => this.toggleHistoricalTracks());
-    }
-
-    initializeWebSocket() {
-        const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
-        const wsUrl = `${protocol}//${window.location.host}/ws`;
-        
-        this.websocket = new WebSocket(wsUrl);
-        
-        this.websocket.onopen = () => {
-            document.getElementById('connection-status').textContent = 'Connected';
-            document.getElementById('connection-status').className = 'connection-status connected';
-        };
-        
-        this.websocket.onclose = () => {
-            document.getElementById('connection-status').textContent = 'Disconnected';
-            document.getElementById('connection-status').className = 'connection-status disconnected';
-            setTimeout(() => this.initializeWebSocket(), 5000);
-        };
-        
-        this.websocket.onmessage = (event) => {
-            const message = JSON.parse(event.data);
-            if (message.type === 'aircraft_update') {
-                this.updateAircraftData(message.data);
-            }
-        };
-    }
-
-    initializeEventListeners() {
-        const searchInput = document.getElementById('search-input');
-        const sortSelect = document.getElementById('sort-select');
-        
-        searchInput.addEventListener('input', () => this.filterAircraftTable());
-        sortSelect.addEventListener('change', () => this.sortAircraftTable());
-    }
-
-    initializeCharts() {
-        const aircraftCtx = document.getElementById('aircraft-chart').getContext('2d');
-        const messageCtx = document.getElementById('message-chart').getContext('2d');
-
-        this.charts.aircraft = new Chart(aircraftCtx, {
-            type: 'line',
-            data: {
-                labels: [],
-                datasets: [{
-                    label: 'Aircraft Count',
-                    data: [],
-                    borderColor: '#00a8ff',
-                    backgroundColor: 'rgba(0, 168, 255, 0.1)',
-                    tension: 0.4
-                }]
-            },
-            options: {
-                responsive: true,
-                maintainAspectRatio: false,
-                plugins: {
-                    legend: { display: false }
-                },
-                scales: {
-                    y: { beginAtZero: true }
-                }
-            }
-        });
-
-        this.charts.messages = new Chart(messageCtx, {
-            type: 'line',
-            data: {
-                labels: [],
-                datasets: [{
-                    label: 'Messages/sec',
-                    data: [],
-                    borderColor: '#2ecc71',
-                    backgroundColor: 'rgba(46, 204, 113, 0.1)',
-                    tension: 0.4
-                }]
-            },
-            options: {
-                responsive: true,
-                maintainAspectRatio: false,
-                plugins: {
-                    legend: { display: false }
-                },
-                scales: {
-                    y: { beginAtZero: true }
-                }
-            }
-        });
-    }
-
-    initializeClocks() {
-        this.updateClocks();
-        setInterval(() => this.updateClocks(), 1000);
-    }
-
-    updateClocks() {
-        const now = new Date();
-        const utcNow = new Date(now.getTime() + (now.getTimezoneOffset() * 60000));
-        
-        this.updateClock('utc', utcNow);
-        this.updateClock('update', this.lastUpdateTime);
-    }
-
-    updateClock(prefix, time) {
-        const hours = time.getUTCHours();
-        const minutes = time.getUTCMinutes();
-        
-        const hourAngle = (hours % 12) * 30 + minutes * 0.5;
-        const minuteAngle = minutes * 6;
-        
-        const hourHand = document.getElementById(`${prefix}-hour`);
-        const minuteHand = document.getElementById(`${prefix}-minute`);
-        
-        if (hourHand) hourHand.style.transform = `rotate(${hourAngle}deg)`;
-        if (minuteHand) minuteHand.style.transform = `rotate(${minuteAngle}deg)`;
-    }
-
-    updateAircraftData(data) {
-        this.aircraftData = data.aircraft || [];
-        this.lastUpdateTime = new Date();
-        this.updateMapMarkers();
-        this.updateAircraftTable();
-        this.updateStats();
-        
-        document.getElementById('aircraft-count').textContent = `${this.aircraftData.length} aircraft`;
-    }
-
-    updateMapMarkers() {
-        const currentHexCodes = new Set(this.aircraftData.map(a => a.hex));
-        
-        this.aircraftMarkers.forEach((marker, hex) => {
-            if (!currentHexCodes.has(hex)) {
-                this.map.removeLayer(marker);
-                this.aircraftMarkers.delete(hex);
-            }
-        });
-
-        this.aircraftData.forEach(aircraft => {
-            if (!aircraft.lat || !aircraft.lon) return;
-
-            const pos = [aircraft.lat, aircraft.lon];
-            
-            if (this.aircraftMarkers.has(aircraft.hex)) {
-                const marker = this.aircraftMarkers.get(aircraft.hex);
-                marker.setLatLng(pos);
-                this.updateMarkerRotation(marker, aircraft.track, aircraft);
-                this.updatePopupContent(marker, aircraft);
-            } else {
-                const marker = this.createAircraftMarker(aircraft, pos);
-                this.aircraftMarkers.set(aircraft.hex, marker);
-            }
-
-            if (this.showTrails) {
-                this.updateTrail(aircraft.hex, pos);
-            }
-            
-            if (this.showHistoricalTracks && aircraft.track_history && aircraft.track_history.length > 1) {
-                this.displayHistoricalTrack(aircraft.hex, aircraft.track_history, aircraft.flight);
-            }
-        });
-    }
-
-    createAircraftMarker(aircraft, pos) {
-        const hasPosition = aircraft.lat && aircraft.lon;
-        const size = hasPosition ? 24 : 18;
-        
-        const icon = L.divIcon({
-            html: this.getAircraftIcon(aircraft),
-            className: 'aircraft-marker',
-            iconSize: [size, size],
-            iconAnchor: [size/2, size/2]
-        });
-
-        const marker = L.marker(pos, { icon }).addTo(this.map);
-        
-        marker.bindPopup(this.createPopupContent(aircraft), {
-            className: 'aircraft-popup'
-        });
-        
-        marker.on('click', () => {
-            if (this.showHistoricalTracks) {
-                this.loadAircraftHistory(aircraft.hex);
-            }
-        });
-
-        return marker;
-    }
-
-    getAircraftType(aircraft) {
-        if (aircraft.on_ground) return 'ground';
-        
-        // Determine type based on flight number patterns and characteristics
-        const flight = aircraft.flight || '';
-        
-        // Cargo airlines (simplified patterns)
-        if (/^(UPS|FDX|FX|ABX|ATN|5Y|QY)/i.test(flight)) return 'cargo';
-        
-        // Military patterns (basic)
-        if (/^(RCH|CNV|MAC|EVAC|ARMY|NAVY|AF|USAF)/i.test(flight)) return 'military';
-        
-        // General aviation (no airline code pattern)
-        if (flight.length > 0 && !/^[A-Z]{2,3}[0-9]/.test(flight)) return 'ga';
-        
-        // Default commercial
-        return 'commercial';
-    }
-
-    getAircraftIcon(aircraft) {
-        const rotation = aircraft.track || 0;
-        const hasPosition = aircraft.lat && aircraft.lon;
-        const type = this.getAircraftType(aircraft);
-        const size = hasPosition ? 24 : 18;
-        
-        let color, icon;
-        
-        switch (type) {
-            case 'cargo':
-                color = hasPosition ? "#ff8c00" : "#666666";
-                icon = `<rect x="8" y="6" width="8" height="12" fill="${color}" stroke="#ffffff" stroke-width="2"/>
-                        <polygon points="12,2 10,6 14,6" fill="${color}" stroke="#ffffff" stroke-width="1"/>
-                        <polygon points="4,10 8,8 8,14" fill="${color}" stroke="#ffffff" stroke-width="1"/>
-                        <polygon points="20,10 16,8 16,14" fill="${color}" stroke="#ffffff" stroke-width="1"/>`;
-                break;
-            case 'military':
-                color = hasPosition ? "#ff4444" : "#666666";
-                icon = `<polygon points="12,2 9,20 12,18 15,20" fill="${color}" stroke="#ffffff" stroke-width="2"/>
-                        <polygon points="6,8 12,6 12,10" fill="${color}" stroke="#ffffff" stroke-width="1"/>
-                        <polygon points="18,8 12,6 12,10" fill="${color}" stroke="#ffffff" stroke-width="1"/>
-                        <polygon points="8,16 12,14 12,18" fill="${color}" stroke="#ffffff" stroke-width="1"/>
-                        <polygon points="16,16 12,14 12,18" fill="${color}" stroke="#ffffff" stroke-width="1"/>`;
-                break;
-            case 'ga':
-                color = hasPosition ? "#ffff00" : "#666666";
-                icon = `<polygon points="12,2 11,20 12,19 13,20" fill="${color}" stroke="#ffffff" stroke-width="2"/>
-                        <polygon points="7,12 12,10 12,14" fill="${color}" stroke="#ffffff" stroke-width="1"/>
-                        <polygon points="17,12 12,10 12,14" fill="${color}" stroke="#ffffff" stroke-width="1"/>`;
-                break;
-            case 'ground':
-                color = "#888888";
-                icon = `<circle cx="12" cy="12" r="6" fill="${color}" stroke="#ffffff" stroke-width="2"/>
-                        <text x="12" y="16" text-anchor="middle" font-size="8" fill="#ffffff">G</text>`;
-                break;
-            default: // commercial
-                color = hasPosition ? "#00ff88" : "#666666";
-                icon = `<polygon points="12,2 10,20 12,18 14,20" fill="${color}" stroke="#ffffff" stroke-width="2"/>
-                        <polygon points="5,10 12,8 12,12" fill="${color}" stroke="#ffffff" stroke-width="1"/>
-                        <polygon points="19,10 12,8 12,12" fill="${color}" stroke="#ffffff" stroke-width="1"/>`;
-                break;
-        }
-        
-        return `<svg width="${size}" height="${size}" viewBox="0 0 24 24" style="transform: rotate(${rotation}deg); filter: drop-shadow(0 0 3px rgba(0,0,0,0.8));">
-            ${icon}
-        </svg>`;
-    }
-
-    updateMarkerRotation(marker, track, aircraft) {
-        if (track !== undefined) {
-            const hasPosition = aircraft.lat && aircraft.lon;
-            const size = hasPosition ? 24 : 18;
-            
-            const icon = L.divIcon({
-                html: this.getAircraftIcon(aircraft),
-                className: 'aircraft-marker',
-                iconSize: [size, size],
-                iconAnchor: [size/2, size/2]
-            });
-            marker.setIcon(icon);
-        }
-    }
-
-    createPopupContent(aircraft) {
-        const type = this.getAircraftType(aircraft);
-        const distance = this.calculateDistance(aircraft);
-        const distanceKm = distance ? (distance * 1.852).toFixed(1) : 'N/A';
-        const altitudeM = aircraft.alt_baro ? Math.round(aircraft.alt_baro * 0.3048) : 'N/A';
-        const speedKmh = aircraft.gs ? Math.round(aircraft.gs * 1.852) : 'N/A';
-        const trackText = aircraft.track ? `${aircraft.track}° (${this.getTrackDirection(aircraft.track)})` : 'N/A';
-        
-        return `
-            <div class="aircraft-popup">
-                <div class="popup-header">
-                    <div class="flight-info">
-                        <span class="icao-flag">${this.getCountryFlag(aircraft.country)}</span>
-                        <span class="flight-id">${aircraft.hex}</span>
-                        ${aircraft.flight ? `→ <span class="callsign">${aircraft.flight}</span>` : ''}
-                    </div>
-                </div>
-                
-                <div class="popup-details">
-                    <div class="detail-row">
-                        <strong>Country of registration:</strong> ${aircraft.country || 'Unknown'}
-                    </div>
-                    <div class="detail-row">
-                        <strong>Registration:</strong> ${aircraft.registration || aircraft.hex}
-                    </div>
-                    <div class="detail-row">
-                        <strong>Type:</strong> ${type.charAt(0).toUpperCase() + type.slice(1)}
-                    </div>
-                    
-                    <div class="detail-grid">
-                        <div class="detail-item">
-                            <div class="label">Altitude:</div>
-                            <div class="value">${aircraft.alt_baro ? `▲ ${aircraft.alt_baro} ft | ${altitudeM} m` : 'N/A'}</div>
-                        </div>
-                        <div class="detail-item">
-                            <div class="label">Squawk:</div>
-                            <div class="value">${aircraft.squawk || 'N/A'}</div>
-                        </div>
-                        <div class="detail-item">
-                            <div class="label">Speed:</div>
-                            <div class="value">${aircraft.gs ? `${aircraft.gs} kt | ${speedKmh} km/h` : 'N/A'}</div>
-                        </div>
-                        <div class="detail-item">
-                            <div class="label">RSSI:</div>
-                            <div class="value">${aircraft.rssi ? `${aircraft.rssi.toFixed(1)} dBFS` : 'N/A'}</div>
-                        </div>
-                        <div class="detail-item">
-                            <div class="label">Track:</div>
-                            <div class="value">${trackText}</div>
-                        </div>
-                        <div class="detail-item">
-                            <div class="label">Last seen:</div>
-                            <div class="value">${aircraft.seen ? `${aircraft.seen.toFixed(1)}s ago` : 'now'}</div>
-                        </div>
-                    </div>
-                    
-                    <div class="detail-row">
-                        <strong>Position:</strong> ${aircraft.lat && aircraft.lon ? 
-                            `${aircraft.lat.toFixed(3)}°, ${aircraft.lon.toFixed(3)}°` : 'N/A'}
-                    </div>
-                    <div class="detail-row">
-                        <strong>Distance from Site:</strong> ${distance ? `${distance} NM | ${distanceKm} km` : 'N/A'}
-                    </div>
-                </div>
-            </div>
-        `;
-    }
-    
-    getCountryFlag(country) {
-        const flags = {
-            'United States': '🇺🇸',
-            'United Kingdom': '🇬🇧',
-            'Germany': '🇩🇪',
-            'France': '🇫🇷',
-            'Netherlands': '🇳🇱',
-            'Sweden': '🇸🇪',
-            'Spain': '🇪🇸',
-            'Italy': '🇮🇹',
-            'Canada': '🇨🇦',
-            'Japan': '🇯🇵',
-            'Denmark': '🇩🇰',
-            'Austria': '🇦🇹',
-            'Belgium': '🇧🇪',
-            'Finland': '🇫🇮',
-            'Greece': '🇬🇷'
-        };
-        return flags[country] || '🏳️';
-    }
-    
-    getTrackDirection(track) {
-        const directions = ['N', 'NNE', 'NE', 'ENE', 'E', 'ESE', 'SE', 'SSE', 
-                          'S', 'SSW', 'SW', 'WSW', 'W', 'WNW', 'NW', 'NNW'];
-        const index = Math.round(track / 22.5) % 16;
-        return directions[index];
-    }
-
-    updatePopupContent(marker, aircraft) {
-        marker.setPopupContent(this.createPopupContent(aircraft));
-    }
-
-    updateTrail(hex, pos) {
-        if (!this.aircraftTrails.has(hex)) {
-            this.aircraftTrails.set(hex, []);
-        }
-        
-        const trail = this.aircraftTrails.get(hex);
-        trail.push(pos);
-        
-        if (trail.length > 50) {
-            trail.shift();
-        }
-        
-        const polyline = L.polyline(trail, {
-            color: '#00a8ff',
-            weight: 2,
-            opacity: 0.6
-        }).addTo(this.map);
-    }
-
-    toggleTrails() {
-        this.showTrails = !this.showTrails;
-        
-        if (!this.showTrails) {
-            this.aircraftTrails.clear();
-            this.map.eachLayer(layer => {
-                if (layer instanceof L.Polyline) {
-                    this.map.removeLayer(layer);
-                }
-            });
-        }
-        
-        document.getElementById('toggle-trails').textContent = 
-            this.showTrails ? 'Hide Trails' : 'Show Trails';
-    }
-
-    centerMapOnAircraft() {
-        if (this.aircraftData.length === 0) return;
-        
-        const validAircraft = this.aircraftData.filter(a => a.lat && a.lon);
-        if (validAircraft.length === 0) return;
-        
-        const group = new L.featureGroup(
-            validAircraft.map(a => L.marker([a.lat, a.lon]))
-        );
-        
-        this.map.fitBounds(group.getBounds().pad(0.1));
-    }
-
-    updateAircraftTable() {
-        const tbody = document.getElementById('aircraft-tbody');
-        tbody.innerHTML = '';
-        
-        let filteredData = [...this.aircraftData];
-        
-        const searchTerm = document.getElementById('search-input').value.toLowerCase();
-        if (searchTerm) {
-            filteredData = filteredData.filter(aircraft => 
-                (aircraft.flight && aircraft.flight.toLowerCase().includes(searchTerm)) ||
-                aircraft.hex.toLowerCase().includes(searchTerm) ||
-                (aircraft.squawk && aircraft.squawk.includes(searchTerm))
-            );
-        }
-        
-        const sortBy = document.getElementById('sort-select').value;
-        this.sortAircraft(filteredData, sortBy);
-        
-        filteredData.forEach(aircraft => {
-            const type = this.getAircraftType(aircraft);
-            const country = aircraft.country || 'Unknown';
-            const countryFlag = this.getCountryFlag(country);
-            const age = aircraft.seen ? aircraft.seen.toFixed(0) : '0';
-            const distance = this.calculateDistance(aircraft);
-            const distanceStr = distance ? distance.toFixed(1) : '-';
-            const altitudeStr = aircraft.alt_baro ? 
-                (aircraft.alt_baro >= 0 ? `▲ ${aircraft.alt_baro}` : `▼ ${Math.abs(aircraft.alt_baro)}`) : 
-                '-';
-            
-            const row = document.createElement('tr');
-            // Color code RSSI values
-            let rssiStr = '-';
-            let rssiClass = '';
-            if (aircraft.rssi) {
-                const rssi = aircraft.rssi;
-                rssiStr = rssi.toFixed(1);
-                if (rssi > -10) rssiClass = 'rssi-strong';
-                else if (rssi > -20) rssiClass = 'rssi-good';
-                else if (rssi > -30) rssiClass = 'rssi-weak';
-                else rssiClass = 'rssi-poor';
-            }
-            
-            row.innerHTML = `
-                <td><span class="type-badge ${type}">${aircraft.hex}</span></td>
-                <td>${aircraft.flight || '-'}</td>
-                <td>${aircraft.squawk || '-'}</td>
-                <td>${altitudeStr}</td>
-                <td>${aircraft.gs || '-'}</td>
-                <td>${distanceStr}</td>
-                <td>${aircraft.track || '-'}°</td>
-                <td>${aircraft.messages || '-'}</td>
-                <td>${age}</td>
-                <td><span class="${rssiClass}">${rssiStr}</span></td>
-            `;
-            
-            row.addEventListener('click', () => {
-                if (aircraft.lat && aircraft.lon) {
-                    this.switchView('map');
-                    document.getElementById('map-view-btn').classList.add('active');
-                    document.querySelectorAll('.view-btn:not(#map-view-btn)').forEach(btn => 
-                        btn.classList.remove('active'));
-                    document.querySelectorAll('.view:not(#map-view)').forEach(view => 
-                        view.classList.remove('active'));
-                    document.getElementById('map-view').classList.add('active');
-                    
-                    this.map.setView([aircraft.lat, aircraft.lon], 12);
-                    
-                    const marker = this.aircraftMarkers.get(aircraft.hex);
-                    if (marker) {
-                        marker.openPopup();
-                    }
-                }
-            });
-            
-            tbody.appendChild(row);
-        });
-    }
-
-    filterAircraftTable() {
-        this.updateAircraftTable();
-    }
-
-    sortAircraftTable() {
-        this.updateAircraftTable();
-    }
-
-    sortAircraft(aircraft, sortBy) {
-        aircraft.sort((a, b) => {
-            switch (sortBy) {
-                case 'distance':
-                    return (this.calculateDistance(a) || Infinity) - (this.calculateDistance(b) || Infinity);
-                case 'altitude':
-                    return (b.alt_baro || 0) - (a.alt_baro || 0);
-                case 'speed':
-                    return (b.gs || 0) - (a.gs || 0);
-                case 'flight':
-                    return (a.flight || a.hex).localeCompare(b.flight || b.hex);
-                case 'icao':
-                    return a.hex.localeCompare(b.hex);
-                case 'squawk':
-                    return (a.squawk || '').localeCompare(b.squawk || '');
-                case 'age':
-                    return (a.seen || 0) - (b.seen || 0);
-                case 'rssi':
-                    return (b.rssi || -999) - (a.rssi || -999);
-                default:
-                    return 0;
-            }
-        });
-    }
-
-    calculateDistance(aircraft) {
-        if (!aircraft.lat || !aircraft.lon) return null;
-        
-        const centerLat = this.origin.latitude;
-        const centerLng = this.origin.longitude;
-        
-        const R = 3440.065;
-        const dLat = (aircraft.lat - centerLat) * Math.PI / 180;
-        const dLon = (aircraft.lon - centerLng) * Math.PI / 180;
-        const a = Math.sin(dLat/2) * Math.sin(dLat/2) +
-                Math.cos(centerLat * Math.PI / 180) * Math.cos(aircraft.lat * Math.PI / 180) *
-                Math.sin(dLon/2) * Math.sin(dLon/2);
-        const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
-        return R * c;  // Return a number, not a string
-    }
-
-    updateStats() {
-        document.getElementById('total-aircraft').textContent = this.aircraftData.length;
-        
-        const withPosition = this.aircraftData.filter(a => a.lat && a.lon).length;
-        const avgAltitude = this.aircraftData
-            .filter(a => a.alt_baro)
-            .reduce((sum, a) => sum + a.alt_baro, 0) / this.aircraftData.length || 0;
-        
-        const distances = this.aircraftData
-            .map(a => this.calculateDistance(a))
-            .filter(d => d !== null);
-        const maxDistance = distances.length > 0 ? Math.max(...distances) : 0;
-        
-        document.getElementById('max-range').textContent = `${maxDistance.toFixed(1)} nm`;
-        
-        this.updateChartData();
-    }
-
-    updateChartData() {
-        const now = new Date();
-        const timeLabel = now.toLocaleTimeString();
-        
-        if (this.charts.aircraft) {
-            const chart = this.charts.aircraft;
-            chart.data.labels.push(timeLabel);
-            chart.data.datasets[0].data.push(this.aircraftData.length);
-            
-            if (chart.data.labels.length > 20) {
-                chart.data.labels.shift();
-                chart.data.datasets[0].data.shift();
-            }
-            
-            chart.update('none');
-        }
-        
-        if (this.charts.messages) {
-            const chart = this.charts.messages;
-            const totalMessages = this.aircraftData.reduce((sum, a) => sum + (a.messages || 0), 0);
-            const messagesPerSec = totalMessages / 60;
-            
-            chart.data.labels.push(timeLabel);
-            chart.data.datasets[0].data.push(messagesPerSec);
-            
-            if (chart.data.labels.length > 20) {
-                chart.data.labels.shift();
-                chart.data.datasets[0].data.shift();
-            }
-            
-            chart.update('none');
-            
-            document.getElementById('messages-sec').textContent = Math.round(messagesPerSec);
-        }
-    }
-
-    startPeriodicUpdates() {
-        setInterval(() => {
-            if (this.websocket.readyState !== WebSocket.OPEN) {
-                this.fetchAircraftData();
-            }
-        }, 5000);
-        
-        setInterval(() => {
-            this.fetchStatsData();
-        }, 10000);
-    }
-
-    async fetchAircraftData() {
-        try {
-            const response = await fetch('/api/aircraft');
-            const data = await response.json();
-            this.updateAircraftData(data);
-        } catch (error) {
-            console.error('Failed to fetch aircraft data:', error);
-        }
-    }
-
-    async fetchStatsData() {
-        try {
-            const response = await fetch('/api/stats');
-            const stats = await response.json();
-            
-            if (stats.total && stats.total.messages) {
-                const messagesPerSec = stats.total.messages.last1min / 60;
-                document.getElementById('messages-sec').textContent = Math.round(messagesPerSec);
-            }
-            
-            // Calculate average RSSI from aircraft data
-            const aircraftWithRSSI = this.aircraftData.filter(a => a.rssi);
-            if (aircraftWithRSSI.length > 0) {
-                const avgRSSI = aircraftWithRSSI.reduce((sum, a) => sum + a.rssi, 0) / aircraftWithRSSI.length;
-                document.getElementById('signal-strength').textContent = `${avgRSSI.toFixed(1)} dBFS`;
-            } else {
-                document.getElementById('signal-strength').textContent = '0 dBFS';
-            }
-        } catch (error) {
-            console.error('Failed to fetch stats:', error);
-        }
-    }
-
-    toggleHistoricalTracks() {
-        this.showHistoricalTracks = !this.showHistoricalTracks;
-        
-        const btn = document.getElementById('toggle-history');
-        btn.textContent = this.showHistoricalTracks ? 'Hide History' : 'Show History';
-        
-        if (!this.showHistoricalTracks) {
-            this.clearAllHistoricalTracks();
-        }
-    }
-
-    async loadAircraftHistory(hex) {
-        try {
-            const response = await fetch(`/api/aircraft/${hex}/history`);
-            const data = await response.json();
-            
-            if (data.track_history && data.track_history.length > 1) {
-                this.displayHistoricalTrack(hex, data.track_history, data.flight);
-            }
-        } catch (error) {
-            console.error('Failed to load aircraft history:', error);
-        }
-    }
-
-    displayHistoricalTrack(hex, trackHistory, flight) {
-        this.clearHistoricalTrack(hex);
-        
-        const points = trackHistory.map(point => [point.lat, point.lon]);
-        
-        const polyline = L.polyline(points, {
-            color: '#ff6b6b',
-            weight: 3,
-            opacity: 0.8,
-            dashArray: '5, 5'
-        }).addTo(this.map);
-        
-        polyline.bindPopup(`<b>Historical Track</b><br>${flight || hex}<br>${trackHistory.length} points`);
-        
-        this.historicalTracks.set(hex, polyline);
-        
-        // Add start/end markers
-        if (trackHistory.length > 0) {
-            const start = trackHistory[0];
-            const end = trackHistory[trackHistory.length - 1];
-            
-            L.circleMarker([start.lat, start.lon], {
-                color: '#ffffff',
-                fillColor: '#00ff00',
-                fillOpacity: 0.8,
-                radius: 4
-            }).addTo(this.map).bindPopup(`<b>Start</b><br>${new Date(start.timestamp).toLocaleString()}`);
-            
-            L.circleMarker([end.lat, end.lon], {
-                color: '#ffffff',
-                fillColor: '#ff0000',
-                fillOpacity: 0.8,
-                radius: 4
-            }).addTo(this.map).bindPopup(`<b>End</b><br>${new Date(end.timestamp).toLocaleString()}`);
-        }
-    }
-
-    clearHistoricalTrack(hex) {
-        if (this.historicalTracks.has(hex)) {
-            this.map.removeLayer(this.historicalTracks.get(hex));
-            this.historicalTracks.delete(hex);
-        }
-    }
-
-    clearAllHistoricalTracks() {
-        this.historicalTracks.forEach(track => {
-            this.map.removeLayer(track);
-        });
-        this.historicalTracks.clear();
-        
-        // Also remove start/end markers
-        this.map.eachLayer(layer => {
-            if (layer instanceof L.CircleMarker) {
-                this.map.removeLayer(layer);
-            }
-        });
-    }
-}
-
-document.addEventListener('DOMContentLoaded', () => {
-    new SkyView();
-});