Initial commit: Norwegian emergency shelter finder app

Android app (Kotlin) that locates the nearest public shelter (tilfluktsrom) in Norway. Designed for offline-first emergency use. Features: - Downloads and caches all 556 Norwegian shelter locations from Geonorge - GPS-based nearest shelter finding with distance and bearing - OSMDroid map with offline tile caching for surroundings - Large directional compass arrow pointing to selected shelter - Compass sensor integration for real-time direction updates - Shows 3 nearest shelters with distance, capacity, and address - Toggle between map view and compass/arrow view - Auto-caches map tiles on first launch for offline use - Weekly background data refresh with manual force-update - i18n: Norwegian Bokmål, Nynorsk, and English Technical: - EPSG:25833 (UTM33N) → WGS84 coordinate conversion - Haversine distance and bearing calculations - Room database for shelter persistence - Fused Location Provider for precise GPS - Sensor fusion (rotation vector with accel+mag fallback) for compass Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-08 16:14:19 +01:00 · 2026-03-08 16:14:19 +01:00 · 27cad094e7
commit 27cad094e7
44 changed files with 2222 additions and 0 deletions
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@ -0,0 +1,70 @@
+plugins {
+    id("com.android.application")
+    id("org.jetbrains.kotlin.android")
+    id("com.google.devtools.ksp")
+}
+
+android {
+    namespace = "no.naiv.tilfluktsrom"
+    compileSdk = 35
+
+    defaultConfig {
+        applicationId = "no.naiv.tilfluktsrom"
+        minSdk = 26
+        targetSdk = 35
+        versionCode = 1
+        versionName = "1.0.0"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = true
+            isShrinkResources = true
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+
+    buildFeatures {
+        viewBinding = true
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+}
+
+dependencies {
+    // AndroidX
+    implementation("androidx.core:core-ktx:1.13.1")
+    implementation("androidx.appcompat:appcompat:1.7.0")
+    implementation("androidx.activity:activity-ktx:1.9.3")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.8.7")
+    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.8.7")
+    implementation("com.google.android.material:material:1.12.0")
+    implementation("androidx.constraintlayout:constraintlayout:2.2.0")
+
+    // Room (local database for shelter cache)
+    implementation("androidx.room:room-runtime:2.6.1")
+    implementation("androidx.room:room-ktx:2.6.1")
+    ksp("androidx.room:room-compiler:2.6.1")
+
+    // OkHttp (HTTP client for data downloads)
+    implementation("com.squareup.okhttp3:okhttp:4.12.0")
+
+    // OSMDroid (offline-capable OpenStreetMap)
+    implementation("org.osmdroid:osmdroid-android:6.1.20")
+
+    // Google Play Services Location (precise GPS)
+    implementation("com.google.android.gms:play-services-location:21.3.0")
+
+    // Coroutines
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.8.1")
+}
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@ -0,0 +1,12 @@
+# OSMDroid
+-keep class org.osmdroid.** { *; }
+-dontwarn org.osmdroid.**
+
+# Room
+-keep class * extends androidx.room.RoomDatabase
+-keep @androidx.room.Entity class *
+-dontwarn androidx.room.paging.**
+
+# OkHttp
+-dontwarn okhttp3.**
+-dontwarn okio.**
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+    <!-- Write to external storage for OSMDroid tile cache on older devices -->
+    <uses-permission
+        android:name="android.permission.WRITE_EXTERNAL_STORAGE"
+        android:maxSdkVersion="28" />
+
+    <application
+        android:name=".TilfluktsromApp"
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Tilfluktsrom"
+        android:networkSecurityConfig="@xml/network_security_config">
+
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:windowSoftInputMode="adjustPan">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>
--- a/app/src/main/java/no/naiv/tilfluktsrom/MainActivity.kt
+++ b/app/src/main/java/no/naiv/tilfluktsrom/MainActivity.kt
@ -0,0 +1,428 @@
+package no.naiv.tilfluktsrom
+
+import android.Manifest
+import android.content.Context
+import android.content.pm.PackageManager
+import android.hardware.Sensor
+import android.hardware.SensorEvent
+import android.hardware.SensorEventListener
+import android.hardware.SensorManager
+import android.location.Location
+import android.net.ConnectivityManager
+import android.net.NetworkCapabilities
+import android.os.Bundle
+import android.util.Log
+import android.view.View
+import android.widget.Toast
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.content.ContextCompat
+import androidx.lifecycle.lifecycleScope
+import androidx.recyclerview.widget.LinearLayoutManager
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.launch
+import no.naiv.tilfluktsrom.data.MapCacheManager
+import no.naiv.tilfluktsrom.data.Shelter
+import no.naiv.tilfluktsrom.data.ShelterRepository
+import no.naiv.tilfluktsrom.databinding.ActivityMainBinding
+import no.naiv.tilfluktsrom.location.LocationProvider
+import no.naiv.tilfluktsrom.location.ShelterFinder
+import no.naiv.tilfluktsrom.location.ShelterWithDistance
+import no.naiv.tilfluktsrom.ui.ShelterListAdapter
+import no.naiv.tilfluktsrom.util.DistanceUtils
+import org.osmdroid.util.GeoPoint
+import org.osmdroid.views.CustomZoomButtonsController
+import org.osmdroid.views.overlay.Marker
+import org.osmdroid.views.overlay.mylocation.GpsMyLocationProvider
+import org.osmdroid.views.overlay.mylocation.MyLocationNewOverlay
+
+class MainActivity : AppCompatActivity(), SensorEventListener {
+
+    companion object {
+        private const val TAG = "MainActivity"
+        private const val DEFAULT_ZOOM = 14.0
+        private const val NEAREST_COUNT = 3
+    }
+
+    private lateinit var binding: ActivityMainBinding
+    private lateinit var repository: ShelterRepository
+    private lateinit var locationProvider: LocationProvider
+    private lateinit var mapCacheManager: MapCacheManager
+    private lateinit var sensorManager: SensorManager
+    private lateinit var shelterAdapter: ShelterListAdapter
+
+    private var myLocationOverlay: MyLocationNewOverlay? = null
+    private var currentLocation: Location? = null
+    private var allShelters: List<Shelter> = emptyList()
+    private var nearestShelters: List<ShelterWithDistance> = emptyList()
+    private var selectedShelterIndex = 0
+    private var deviceHeading = 0f
+    private var isCompassMode = false
+    private var locationJob: Job? = null
+    private var shelterMarkers: MutableList<Marker> = mutableListOf()
+
+    private val locationPermissionRequest = registerForActivityResult(
+        ActivityResultContracts.RequestMultiplePermissions()
+    ) { permissions ->
+        val fineGranted = permissions[Manifest.permission.ACCESS_FINE_LOCATION] == true
+        val coarseGranted = permissions[Manifest.permission.ACCESS_COARSE_LOCATION] == true
+
+        if (fineGranted || coarseGranted) {
+            startLocationUpdates()
+        } else {
+            Toast.makeText(this, R.string.permission_denied, Toast.LENGTH_LONG).show()
+        }
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = ActivityMainBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        repository = ShelterRepository(this)
+        locationProvider = LocationProvider(this)
+        mapCacheManager = MapCacheManager(this)
+        sensorManager = getSystemService(Context.SENSOR_SERVICE) as SensorManager
+
+        setupMap()
+        setupShelterList()
+        setupButtons()
+        loadData()
+    }
+
+    private fun setupMap() {
+        binding.mapView.apply {
+            setMultiTouchControls(true)
+            zoomController.setVisibility(CustomZoomButtonsController.Visibility.SHOW_AND_FADEOUT)
+            controller.setZoom(DEFAULT_ZOOM)
+            // Default center: roughly central Norway
+            controller.setCenter(GeoPoint(59.9, 10.7))
+
+            // Add user location overlay
+            myLocationOverlay = MyLocationNewOverlay(
+                GpsMyLocationProvider(this@MainActivity), this
+            ).apply {
+                enableMyLocation()
+            }
+            overlays.add(myLocationOverlay)
+        }
+    }
+
+    private fun setupShelterList() {
+        shelterAdapter = ShelterListAdapter { selected ->
+            val idx = nearestShelters.indexOf(selected)
+            if (idx >= 0) {
+                selectedShelterIndex = idx
+                updateSelectedShelter()
+            }
+        }
+
+        binding.shelterList.apply {
+            layoutManager = LinearLayoutManager(this@MainActivity)
+            adapter = shelterAdapter
+        }
+    }
+
+    private fun setupButtons() {
+        binding.toggleViewFab.setOnClickListener {
+            isCompassMode = !isCompassMode
+            if (isCompassMode) {
+                binding.mapView.visibility = View.GONE
+                binding.compassContainer.visibility = View.VISIBLE
+                binding.toggleViewFab.setImageResource(R.drawable.ic_map)
+            } else {
+                binding.mapView.visibility = View.VISIBLE
+                binding.compassContainer.visibility = View.GONE
+                binding.toggleViewFab.setImageResource(R.drawable.ic_compass)
+            }
+        }
+
+        binding.refreshButton.setOnClickListener {
+            forceRefresh()
+        }
+    }
+
+    private fun loadData() {
+        lifecycleScope.launch {
+            val hasData = repository.hasCachedData()
+
+            if (!hasData) {
+                if (!isNetworkAvailable()) {
+                    binding.statusText.text = getString(R.string.error_no_data_offline)
+                    return@launch
+                }
+                showLoading(getString(R.string.loading_shelters))
+                val success = repository.refreshData()
+                hideLoading()
+
+                if (!success) {
+                    binding.statusText.text = getString(R.string.error_download_failed)
+                    return@launch
+                }
+            }
+
+            // Observe shelter data reactively
+            launch {
+                repository.getAllShelters().collectLatest { shelters ->
+                    allShelters = shelters
+                    binding.statusText.text = getString(R.string.status_shelters_loaded, shelters.size)
+                    updateShelterMarkers()
+                    currentLocation?.let { updateNearestShelters(it) }
+                }
+            }
+
+            // Request location and start updates
+            requestLocationPermission()
+
+            // Check for stale data in background
+            if (hasData && repository.isDataStale() && isNetworkAvailable()) {
+                launch {
+                    val success = repository.refreshData()
+                    if (success) {
+                        Toast.makeText(this@MainActivity, R.string.update_success, Toast.LENGTH_SHORT).show()
+                    }
+                }
+            }
+        }
+    }
+
+    private fun requestLocationPermission() {
+        if (locationProvider.hasLocationPermission()) {
+            startLocationUpdates()
+        } else {
+            locationPermissionRequest.launch(
+                arrayOf(
+                    Manifest.permission.ACCESS_FINE_LOCATION,
+                    Manifest.permission.ACCESS_COARSE_LOCATION
+                )
+            )
+        }
+    }
+
+    private fun startLocationUpdates() {
+        locationJob?.cancel()
+        locationJob = lifecycleScope.launch {
+            locationProvider.locationUpdates().collectLatest { location ->
+                currentLocation = location
+                updateNearestShelters(location)
+
+                // Center map on first location fix
+                if (nearestShelters.isEmpty()) {
+                    binding.mapView.controller.animateTo(
+                        GeoPoint(location.latitude, location.longitude)
+                    )
+                }
+
+                // Cache map tiles on first launch
+                if (!mapCacheManager.hasCacheForLocation(location.latitude, location.longitude)) {
+                    if (isNetworkAvailable()) {
+                        cacheMapTiles(location.latitude, location.longitude)
+                    }
+                }
+            }
+        }
+    }
+
+    private fun updateNearestShelters(location: Location) {
+        if (allShelters.isEmpty()) return
+
+        nearestShelters = ShelterFinder.findNearest(
+            allShelters, location.latitude, location.longitude, NEAREST_COUNT
+        )
+
+        shelterAdapter.submitList(nearestShelters)
+        selectedShelterIndex = 0
+        shelterAdapter.selectPosition(0)
+        updateSelectedShelter()
+    }
+
+    private fun updateSelectedShelter() {
+        if (nearestShelters.isEmpty()) return
+
+        val selected = nearestShelters[selectedShelterIndex]
+        val distanceText = DistanceUtils.formatDistance(selected.distanceMeters)
+
+        // Update bottom sheet
+        binding.selectedShelterAddress.text = selected.shelter.adresse
+        binding.selectedShelterDetails.text = getString(
+            R.string.shelter_room_nr, selected.shelter.romnr
+        ) + " - " + getString(
+            R.string.shelter_capacity, selected.shelter.plasser
+        ) + " - " + distanceText
+
+        // Update mini arrow in bottom sheet
+        val bearing = selected.bearingDegrees.toFloat()
+        binding.miniArrow.setDirection(bearing - deviceHeading)
+
+        // Update compass view
+        binding.compassDistanceText.text = distanceText
+        binding.compassAddressText.text = selected.shelter.adresse
+        binding.directionArrow.setDirection(bearing - deviceHeading)
+
+        // Center map on shelter if in map mode
+        if (!isCompassMode) {
+            highlightShelterOnMap(selected)
+        }
+    }
+
+    private fun updateShelterMarkers() {
+        // Remove old markers
+        shelterMarkers.forEach { binding.mapView.overlays.remove(it) }
+        shelterMarkers.clear()
+
+        // Add markers for all shelters
+        allShelters.forEach { shelter ->
+            val marker = Marker(binding.mapView).apply {
+                position = GeoPoint(shelter.latitude, shelter.longitude)
+                setAnchor(Marker.ANCHOR_CENTER, Marker.ANCHOR_BOTTOM)
+                title = shelter.adresse
+                snippet = getString(R.string.shelter_capacity, shelter.plasser) +
+                    " - " + getString(R.string.shelter_room_nr, shelter.romnr)
+                icon = ContextCompat.getDrawable(this@MainActivity, R.drawable.ic_shelter)
+            }
+            shelterMarkers.add(marker)
+            binding.mapView.overlays.add(marker)
+        }
+
+        binding.mapView.invalidate()
+    }
+
+    private fun highlightShelterOnMap(selected: ShelterWithDistance) {
+        val shelterPoint = GeoPoint(selected.shelter.latitude, selected.shelter.longitude)
+
+        // If we have location, show both user and shelter in view
+        currentLocation?.let { loc ->
+            val userPoint = GeoPoint(loc.latitude, loc.longitude)
+            val boundingBox = org.osmdroid.util.BoundingBox.fromGeoPoints(
+                listOf(userPoint, shelterPoint)
+            )
+            // Add padding so markers aren't at the edge
+            binding.mapView.zoomToBoundingBox(boundingBox.increaseByScale(1.5f), true)
+        } ?: run {
+            binding.mapView.controller.animateTo(shelterPoint)
+        }
+    }
+
+    private fun cacheMapTiles(latitude: Double, longitude: Double) {
+        lifecycleScope.launch {
+            binding.statusText.text = getString(R.string.status_caching_map)
+            mapCacheManager.cacheMapArea(
+                binding.mapView, latitude, longitude
+            ) { progress ->
+                binding.statusText.text = getString(R.string.status_caching_map) +
+                    " (${(progress * 100).toInt()}%)"
+            }
+            binding.statusText.text = getString(R.string.status_shelters_loaded, allShelters.size)
+        }
+    }
+
+    private fun forceRefresh() {
+        if (!isNetworkAvailable()) {
+            Toast.makeText(this, R.string.error_download_failed, Toast.LENGTH_SHORT).show()
+            return
+        }
+
+        lifecycleScope.launch {
+            binding.statusText.text = getString(R.string.status_updating)
+            val success = repository.refreshData()
+            if (success) {
+                Toast.makeText(this@MainActivity, R.string.update_success, Toast.LENGTH_SHORT).show()
+            } else {
+                Toast.makeText(this@MainActivity, R.string.update_failed, Toast.LENGTH_SHORT).show()
+            }
+        }
+    }
+
+    private fun showLoading(message: String) {
+        binding.loadingOverlay.visibility = View.VISIBLE
+        binding.loadingText.text = message
+    }
+
+    private fun hideLoading() {
+        binding.loadingOverlay.visibility = View.GONE
+    }
+
+    private fun isNetworkAvailable(): Boolean {
+        val cm = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
+        val network = cm.activeNetwork ?: return false
+        val caps = cm.getNetworkCapabilities(network) ?: return false
+        return caps.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
+    }
+
+    // --- Sensor handling for compass ---
+
+    override fun onResume() {
+        super.onResume()
+        binding.mapView.onResume()
+
+        // Register for rotation vector (best compass source)
+        val rotationSensor = sensorManager.getDefaultSensor(Sensor.TYPE_ROTATION_VECTOR)
+        if (rotationSensor != null) {
+            sensorManager.registerListener(this, rotationSensor, SensorManager.SENSOR_DELAY_UI)
+        } else {
+            // Fallback to accelerometer + magnetometer
+            sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER)?.let {
+                sensorManager.registerListener(this, it, SensorManager.SENSOR_DELAY_UI)
+            }
+            sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD)?.let {
+                sensorManager.registerListener(this, it, SensorManager.SENSOR_DELAY_UI)
+            }
+        }
+    }
+
+    override fun onPause() {
+        super.onPause()
+        binding.mapView.onPause()
+        sensorManager.unregisterListener(this)
+    }
+
+    private val gravity = FloatArray(3)
+    private val geomagnetic = FloatArray(3)
+    private val rotationMatrix = FloatArray(9)
+    private val orientation = FloatArray(3)
+
+    override fun onSensorChanged(event: SensorEvent) {
+        when (event.sensor.type) {
+            Sensor.TYPE_ROTATION_VECTOR -> {
+                SensorManager.getRotationMatrixFromVector(rotationMatrix, event.values)
+                SensorManager.getOrientation(rotationMatrix, orientation)
+                deviceHeading = Math.toDegrees(orientation[0].toDouble()).toFloat()
+                if (deviceHeading < 0) deviceHeading += 360f
+                updateDirectionArrows()
+            }
+            Sensor.TYPE_ACCELEROMETER -> {
+                System.arraycopy(event.values, 0, gravity, 0, 3)
+                updateFromAccelMag()
+            }
+            Sensor.TYPE_MAGNETIC_FIELD -> {
+                System.arraycopy(event.values, 0, geomagnetic, 0, 3)
+                updateFromAccelMag()
+            }
+        }
+    }
+
+    private fun updateFromAccelMag() {
+        val r = FloatArray(9)
+        if (SensorManager.getRotationMatrix(r, null, gravity, geomagnetic)) {
+            SensorManager.getOrientation(r, orientation)
+            deviceHeading = Math.toDegrees(orientation[0].toDouble()).toFloat()
+            if (deviceHeading < 0) deviceHeading += 360f
+            updateDirectionArrows()
+        }
+    }
+
+    private fun updateDirectionArrows() {
+        if (nearestShelters.isEmpty()) return
+        val selected = nearestShelters[selectedShelterIndex]
+        val bearing = selected.bearingDegrees.toFloat()
+        val arrowAngle = bearing - deviceHeading
+
+        binding.directionArrow.setDirection(arrowAngle)
+        binding.miniArrow.setDirection(arrowAngle)
+    }
+
+    override fun onAccuracyChanged(sensor: Sensor?, accuracy: Int) {
+        // No-op
+    }
+}
--- a/app/src/main/java/no/naiv/tilfluktsrom/TilfluktsromApp.kt
+++ b/app/src/main/java/no/naiv/tilfluktsrom/TilfluktsromApp.kt
@ -0,0 +1,19 @@
+package no.naiv.tilfluktsrom
+
+import android.app.Application
+import org.osmdroid.config.Configuration
+
+class TilfluktsromApp : Application() {
+
+    override fun onCreate() {
+        super.onCreate()
+
+        // Configure OSMDroid: set user agent and tile cache path
+        Configuration.getInstance().apply {
+            userAgentValue = packageName
+            // Use app-specific internal storage for tile cache
+            osmdroidBasePath = filesDir
+            osmdroidTileCache = java.io.File(filesDir, "tiles")
+        }
+    }
+}
--- a/app/src/main/java/no/naiv/tilfluktsrom/data/MapCacheManager.kt
+++ b/app/src/main/java/no/naiv/tilfluktsrom/data/MapCacheManager.kt
@ -0,0 +1,155 @@
+package no.naiv.tilfluktsrom.data
+
+import android.content.Context
+import android.util.Log
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import org.osmdroid.tileprovider.cachemanager.CacheManager
+import org.osmdroid.tileprovider.modules.SqlTileWriter
+import org.osmdroid.util.BoundingBox
+import org.osmdroid.util.GeoPoint
+import org.osmdroid.views.MapView
+
+/**
+ * Manages offline map tile caching for the surrounding area.
+ *
+ * On first launch, downloads map tiles for a region around the user's location.
+ * On subsequent launches, checks if the current location is within the cached area.
+ */
+class MapCacheManager(private val context: Context) {
+
+    companion object {
+        private const val TAG = "MapCacheManager"
+        private const val PREFS_NAME = "map_cache_prefs"
+        private const val KEY_CACHED_LAT = "cached_center_lat"
+        private const val KEY_CACHED_LON = "cached_center_lon"
+        private const val KEY_CACHE_RADIUS = "cache_radius_km"
+        private const val KEY_CACHE_COMPLETE = "cache_complete"
+
+        // Cache tiles for ~15km radius at useful zoom levels
+        private const val CACHE_RADIUS_DEGREES = 0.15  // ~15km
+        private const val MIN_ZOOM = 10
+        private const val MAX_ZOOM = 16
+    }
+
+    private val prefs = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
+
+    /**
+     * Check if we have a map cache that covers the given location.
+     */
+    fun hasCacheForLocation(latitude: Double, longitude: Double): Boolean {
+        if (!prefs.getBoolean(KEY_CACHE_COMPLETE, false)) return false
+
+        val cachedLat = Double.fromBits(prefs.getLong(KEY_CACHED_LAT, 0))
+        val cachedLon = Double.fromBits(prefs.getLong(KEY_CACHED_LON, 0))
+        val radius = prefs.getFloat(KEY_CACHE_RADIUS, 0f).toDouble()
+
+        if (radius == 0.0) return false
+
+        // Check if current location is within the cached region (with some margin)
+        val margin = radius * 0.3
+        return Math.abs(latitude - cachedLat) < (radius - margin) &&
+               Math.abs(longitude - cachedLon) < (radius - margin)
+    }
+
+    /**
+     * Download map tiles for the area around the given location.
+     * Reports progress via callback (0.0 to 1.0).
+     */
+    suspend fun cacheMapArea(
+        mapView: MapView,
+        latitude: Double,
+        longitude: Double,
+        onProgress: (Float) -> Unit = {}
+    ): Boolean = withContext(Dispatchers.Main) {
+        try {
+            Log.i(TAG, "Starting map tile cache for area around $latitude, $longitude")
+
+            val boundingBox = BoundingBox(
+                latitude + CACHE_RADIUS_DEGREES,
+                longitude + CACHE_RADIUS_DEGREES,
+                latitude - CACHE_RADIUS_DEGREES,
+                longitude - CACHE_RADIUS_DEGREES
+            )
+
+            val cacheManager = CacheManager(mapView)
+            var complete = false
+            var success = false
+
+            cacheManager.downloadAreaAsync(
+                context,
+                boundingBox,
+                MIN_ZOOM,
+                MAX_ZOOM,
+                object : CacheManager.CacheManagerCallback {
+                    override fun onTaskComplete() {
+                        Log.i(TAG, "Map cache download complete")
+                        success = true
+                        complete = true
+                    }
+
+                    override fun onTaskFailed(errors: Int) {
+                        Log.w(TAG, "Map cache download completed with $errors errors")
+                        // Consider partial success if most tiles downloaded
+                        success = errors < 50
+                        complete = true
+                    }
+
+                    override fun updateProgress(
+                        progress: Int,
+                        currentZoomLevel: Int,
+                        zoomMin: Int,
+                        zoomMax: Int
+                    ) {
+                        val totalZoomLevels = zoomMax - zoomMin + 1
+                        val zoomProgress = (currentZoomLevel - zoomMin).toFloat() / totalZoomLevels
+                        onProgress(zoomProgress + (progress / 100f) / totalZoomLevels)
+                    }
+
+                    override fun downloadStarted() {
+                        Log.i(TAG, "Map cache download started")
+                    }
+
+                    override fun setPossibleTilesInArea(total: Int) {
+                        Log.i(TAG, "Total tiles to download: $total")
+                    }
+                }
+            )
+
+            // Wait for completion (the async callback runs on main thread)
+            withContext(Dispatchers.IO) {
+                while (!complete) {
+                    Thread.sleep(500)
+                }
+            }
+
+            if (success) {
+                prefs.edit()
+                    .putLong(KEY_CACHED_LAT, latitude.toBits())
+                    .putLong(KEY_CACHED_LON, longitude.toBits())
+                    .putFloat(KEY_CACHE_RADIUS, CACHE_RADIUS_DEGREES.toFloat())
+                    .putBoolean(KEY_CACHE_COMPLETE, true)
+                    .apply()
+            }
+
+            success
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to cache map tiles", e)
+            false
+        }
+    }
+
+    /**
+     * Get the approximate number of cached tiles.
+     */
+    fun getCachedTileCount(): Long {
+        return try {
+            val writer = SqlTileWriter()
+            val count = writer.getRowCount(null)
+            writer.onDetach()
+            count
+        } catch (e: Exception) {
+            0L
+        }
+    }
+}
--- a/app/src/main/java/no/naiv/tilfluktsrom/data/Shelter.kt
+++ b/app/src/main/java/no/naiv/tilfluktsrom/data/Shelter.kt
@ -0,0 +1,19 @@
+package no.naiv.tilfluktsrom.data
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+/**
+ * A public shelter (offentlig tilfluktsrom).
+ * Coordinates are stored in WGS84 (EPSG:4326) after conversion from UTM33N.
+ */
+@Entity(tableName = "shelters")
+data class Shelter(
+    @PrimaryKey
+    val lokalId: String,
+    val romnr: Int,
+    val plasser: Int,
+    val adresse: String,
+    val latitude: Double,
+    val longitude: Double
+)
--- a/app/src/main/java/no/naiv/tilfluktsrom/data/ShelterDao.kt
+++ b/app/src/main/java/no/naiv/tilfluktsrom/data/ShelterDao.kt
@ -0,0 +1,26 @@
+package no.naiv.tilfluktsrom.data
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+import kotlinx.coroutines.flow.Flow
+
+@Dao
+interface ShelterDao {
+
+    @Query("SELECT * FROM shelters")
+    fun getAllShelters(): Flow<List<Shelter>>
+
+    @Query("SELECT * FROM shelters")
+    suspend fun getAllSheltersList(): List<Shelter>
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insertAll(shelters: List<Shelter>)
+
+    @Query("DELETE FROM shelters")
+    suspend fun deleteAll()
+
+    @Query("SELECT COUNT(*) FROM shelters")
+    suspend fun count(): Int
+}
--- a/app/src/main/java/no/naiv/tilfluktsrom/data/ShelterDatabase.kt
+++ b/app/src/main/java/no/naiv/tilfluktsrom/data/ShelterDatabase.kt
@ -0,0 +1,27 @@
+package no.naiv.tilfluktsrom.data
+
+import android.content.Context
+import androidx.room.Database
+import androidx.room.Room
+import androidx.room.RoomDatabase
+
+@Database(entities = [Shelter::class], version = 1, exportSchema = false)
+abstract class ShelterDatabase : RoomDatabase() {
+
+    abstract fun shelterDao(): ShelterDao
+
+    companion object {
+        @Volatile
+        private var INSTANCE: ShelterDatabase? = null
+
+        fun getInstance(context: Context): ShelterDatabase {
+            return INSTANCE ?: synchronized(this) {
+                INSTANCE ?: Room.databaseBuilder(
+                    context.applicationContext,
+                    ShelterDatabase::class.java,
+                    "shelters.db"
+                ).build().also { INSTANCE = it }
+            }
+        }
+    }
+}
--- a/app/src/main/java/no/naiv/tilfluktsrom/data/ShelterGeoJsonParser.kt
+++ b/app/src/main/java/no/naiv/tilfluktsrom/data/ShelterGeoJsonParser.kt
@ -0,0 +1,72 @@
+package no.naiv.tilfluktsrom.data
+
+import no.naiv.tilfluktsrom.util.CoordinateConverter
+import org.json.JSONObject
+import java.io.ByteArrayOutputStream
+import java.io.InputStream
+import java.util.zip.ZipInputStream
+
+/**
+ * Parses shelter GeoJSON data from the Geonorge ZIP download.
+ * Converts coordinates from UTM33N (EPSG:25833) to WGS84 (EPSG:4326).
+ */
+object ShelterGeoJsonParser {
+
+    /**
+     * Extract and parse GeoJSON from a ZIP input stream.
+     */
+    fun parseFromZip(zipStream: InputStream): List<Shelter> {
+        val json = extractGeoJsonFromZip(zipStream)
+        return parseGeoJson(json)
+    }
+
+    private fun extractGeoJsonFromZip(zipStream: InputStream): String {
+        ZipInputStream(zipStream).use { zis ->
+            var entry = zis.nextEntry
+            while (entry != null) {
+                if (entry.name.endsWith(".geojson") || entry.name.endsWith(".json")) {
+                    val buffer = ByteArrayOutputStream()
+                    zis.copyTo(buffer)
+                    return buffer.toString(Charsets.UTF_8.name())
+                }
+                entry = zis.nextEntry
+            }
+        }
+        throw IllegalStateException("No GeoJSON file found in ZIP archive")
+    }
+
+    /**
+     * Parse raw GeoJSON string into Shelter objects.
+     */
+    fun parseGeoJson(json: String): List<Shelter> {
+        val root = JSONObject(json)
+        val features = root.getJSONArray("features")
+        val shelters = mutableListOf<Shelter>()
+
+        for (i in 0 until features.length()) {
+            val feature = features.getJSONObject(i)
+            val geometry = feature.getJSONObject("geometry")
+            val properties = feature.getJSONObject("properties")
+
+            val coordinates = geometry.getJSONArray("coordinates")
+            val easting = coordinates.getDouble(0)
+            val northing = coordinates.getDouble(1)
+
+            // Convert UTM33N to WGS84
+            val latLon = CoordinateConverter.utm33nToWgs84(easting, northing)
+
+            shelters.add(
+                Shelter(
+                    lokalId = properties.optString("lokalId", "unknown-$i"),
+                    romnr = properties.optInt("romnr", 0),
+                    plasser = properties.optInt("plasser", 0),
+                    adresse = properties.optString("adresse", ""),
+                    latitude = latLon.latitude,
+                    longitude = latLon.longitude
+                )
+            )
+        }
+
+        return shelters
+    }
+}
--- a/app/src/main/java/no/naiv/tilfluktsrom/data/ShelterRepository.kt
+++ b/app/src/main/java/no/naiv/tilfluktsrom/data/ShelterRepository.kt
@ -0,0 +1,93 @@
+package no.naiv.tilfluktsrom.data
+
+import android.content.Context
+import android.util.Log
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.withContext
+import okhttp3.OkHttpClient
+import okhttp3.Request
+import java.util.concurrent.TimeUnit
+
+/**
+ * Repository managing shelter data: local Room cache + remote Geonorge download.
+ * Offline-first: always returns cached data when available, updates in background.
+ */
+class ShelterRepository(context: Context) {
+
+    companion object {
+        private const val TAG = "ShelterRepository"
+        private const val PREFS_NAME = "shelter_prefs"
+        private const val KEY_LAST_UPDATE = "last_update_ms"
+        private const val UPDATE_INTERVAL_MS = 7 * 24 * 60 * 60 * 1000L // 7 days
+
+        // Geonorge GeoJSON download (ZIP containing all Norwegian shelters)
+        private const val SHELTER_DATA_URL =
+            "https://nedlasting.geonorge.no/geonorge/Samfunnssikkerhet/" +
+            "TilfluktsromOffentlige/GeoJSON/" +
+            "Samfunnssikkerhet_0000_Norge_25833_TilfluktsromOffentlige_GeoJSON.zip"
+    }
+
+    private val db = ShelterDatabase.getInstance(context)
+    private val dao = db.shelterDao()
+    private val prefs = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
+
+    private val client = OkHttpClient.Builder()
+        .connectTimeout(30, TimeUnit.SECONDS)
+        .readTimeout(60, TimeUnit.SECONDS)
+        .build()
+
+    /** Reactive stream of all shelters from local cache. */
+    fun getAllShelters(): Flow<List<Shelter>> = dao.getAllShelters()
+
+    /** Check if we have cached shelter data. */
+    suspend fun hasCachedData(): Boolean = dao.count() > 0
+
+    /** Check if the cached data is stale and should be refreshed. */
+    fun isDataStale(): Boolean {
+        val lastUpdate = prefs.getLong(KEY_LAST_UPDATE, 0)
+        return System.currentTimeMillis() - lastUpdate > UPDATE_INTERVAL_MS
+    }
+
+    /**
+     * Download shelter data from Geonorge and cache it locally.
+     * Returns true on success, false on failure.
+     */
+    suspend fun refreshData(): Boolean = withContext(Dispatchers.IO) {
+        try {
+            Log.i(TAG, "Downloading shelter data from Geonorge...")
+
+            val request = Request.Builder()
+                .url(SHELTER_DATA_URL)
+                .header("User-Agent", "Tilfluktsrom-Android/1.0")
+                .build()
+
+            val response = client.newCall(request).execute()
+            if (!response.isSuccessful) {
+                Log.e(TAG, "Download failed: HTTP ${response.code}")
+                return@withContext false
+            }
+
+            val body = response.body ?: run {
+                Log.e(TAG, "Empty response body")
+                return@withContext false
+            }
+
+            val shelters = body.byteStream().use { stream ->
+                ShelterGeoJsonParser.parseFromZip(stream)
+            }
+
+            Log.i(TAG, "Parsed ${shelters.size} shelters, saving to database...")
+
+            dao.deleteAll()
+            dao.insertAll(shelters)
+
+            prefs.edit().putLong(KEY_LAST_UPDATE, System.currentTimeMillis()).apply()
+            Log.i(TAG, "Shelter data updated successfully")
+            true
+        } catch (e: Exception) {
+            Log.e(TAG, "Failed to refresh shelter data", e)
+            false
+        }
+    }
+}
--- a/app/src/main/java/no/naiv/tilfluktsrom/location/LocationProvider.kt
+++ b/app/src/main/java/no/naiv/tilfluktsrom/location/LocationProvider.kt
@ -0,0 +1,93 @@
+package no.naiv.tilfluktsrom.location
+
+import android.Manifest
+import android.content.Context
+import android.content.pm.PackageManager
+import android.location.Location
+import android.os.Looper
+import android.util.Log
+import androidx.core.content.ContextCompat
+import com.google.android.gms.location.FusedLocationProviderClient
+import com.google.android.gms.location.LocationCallback
+import com.google.android.gms.location.LocationRequest
+import com.google.android.gms.location.LocationResult
+import com.google.android.gms.location.LocationServices
+import com.google.android.gms.location.Priority
+import kotlinx.coroutines.channels.awaitClose
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.callbackFlow
+
+/**
+ * Provides GPS location updates using the Fused Location Provider.
+ * Emits location updates as a Flow for reactive consumption.
+ */
+class LocationProvider(private val context: Context) {
+
+    companion object {
+        private const val TAG = "LocationProvider"
+        private const val UPDATE_INTERVAL_MS = 5000L
+        private const val FASTEST_INTERVAL_MS = 2000L
+    }
+
+    private val fusedClient: FusedLocationProviderClient =
+        LocationServices.getFusedLocationProviderClient(context)
+
+    /**
+     * Stream of location updates. Emits the last known location first (if available),
+     * then continuous updates.
+     */
+    fun locationUpdates(): Flow<Location> = callbackFlow {
+        if (!hasLocationPermission()) {
+            Log.w(TAG, "Location permission not granted")
+            close()
+            return@callbackFlow
+        }
+
+        // Try to get last known location for immediate display
+        try {
+            fusedClient.lastLocation.addOnSuccessListener { location ->
+                if (location != null) {
+                    trySend(location)
+                }
+            }
+        } catch (e: SecurityException) {
+            Log.e(TAG, "SecurityException getting last location", e)
+        }
+
+        val locationRequest = LocationRequest.Builder(
+            Priority.PRIORITY_HIGH_ACCURACY,
+            UPDATE_INTERVAL_MS
+        ).apply {
+            setMinUpdateIntervalMillis(FASTEST_INTERVAL_MS)
+            setWaitForAccurateLocation(false)
+        }.build()
+
+        val callback = object : LocationCallback() {
+            override fun onLocationResult(result: LocationResult) {
+                result.lastLocation?.let { trySend(it) }
+            }
+        }
+
+        try {
+            fusedClient.requestLocationUpdates(
+                locationRequest,
+                callback,
+                Looper.getMainLooper()
+            )
+        } catch (e: SecurityException) {
+            Log.e(TAG, "SecurityException requesting location updates", e)
+            close()
+            return@callbackFlow
+        }
+
+        awaitClose {
+            fusedClient.removeLocationUpdates(callback)
+        }
+    }
+
+    fun hasLocationPermission(): Boolean {
+        return ContextCompat.checkSelfPermission(
+            context, Manifest.permission.ACCESS_FINE_LOCATION
+        ) == PackageManager.PERMISSION_GRANTED
+    }
+}
--- a/app/src/main/java/no/naiv/tilfluktsrom/location/ShelterFinder.kt
+++ b/app/src/main/java/no/naiv/tilfluktsrom/location/ShelterFinder.kt
@ -0,0 +1,47 @@
+package no.naiv.tilfluktsrom.location
+
+import no.naiv.tilfluktsrom.data.Shelter
+import no.naiv.tilfluktsrom.util.DistanceUtils
+
+/**
+ * Result containing a shelter and its distance/bearing from the user.
+ */
+data class ShelterWithDistance(
+    val shelter: Shelter,
+    val distanceMeters: Double,
+    val bearingDegrees: Double
+)
+
+/**
+ * Finds the nearest shelters to a given location.
+ */
+object ShelterFinder {
+
+    /**
+     * Find the N nearest shelters to the given location.
+     * Returns results sorted by distance (nearest first).
+     */
+    fun findNearest(
+        shelters: List<Shelter>,
+        latitude: Double,
+        longitude: Double,
+        count: Int = 3
+    ): List<ShelterWithDistance> {
+        return shelters
+            .map { shelter ->
+                ShelterWithDistance(
+                    shelter = shelter,
+                    distanceMeters = DistanceUtils.distanceMeters(
+                        latitude, longitude,
+                        shelter.latitude, shelter.longitude
+                    ),
+                    bearingDegrees = DistanceUtils.bearingDegrees(
+                        latitude, longitude,
+                        shelter.latitude, shelter.longitude
+                    )
+                )
+            }
+            .sortedBy { it.distanceMeters }
+            .take(count)
+    }
+}
--- a/app/src/main/java/no/naiv/tilfluktsrom/ui/DirectionArrowView.kt
+++ b/app/src/main/java/no/naiv/tilfluktsrom/ui/DirectionArrowView.kt
@ -0,0 +1,77 @@
+package no.naiv.tilfluktsrom.ui
+
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.Paint
+import android.graphics.Path
+import android.util.AttributeSet
+import android.view.View
+import no.naiv.tilfluktsrom.R
+
+/**
+ * Custom view that displays a large directional arrow pointing toward
+ * the target shelter. The arrow rotates based on the bearing to the
+ * shelter relative to the device heading (compass).
+ *
+ * rotationAngle = shelterBearing - deviceHeading
+ * This gives the direction the user needs to walk, adjusted for which
+ * way they're currently facing.
+ */
+class DirectionArrowView @JvmOverloads constructor(
+    context: Context,
+    attrs: AttributeSet? = null,
+    defStyleAttr: Int = 0
+) : View(context, attrs, defStyleAttr) {
+
+    private var rotationAngle = 0f
+
+    private val arrowPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
+        color = context.getColor(R.color.shelter_primary)
+        style = Paint.Style.FILL
+    }
+
+    private val outlinePaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
+        color = Color.WHITE
+        style = Paint.Style.STROKE
+        strokeWidth = 4f
+    }
+
+    private val arrowPath = Path()
+
+    /**
+     * Set the rotation angle in degrees.
+     * 0 = pointing up (north/forward), positive = clockwise.
+     */
+    fun setDirection(degrees: Float) {
+        rotationAngle = degrees
+        invalidate()
+    }
+
+    override fun onDraw(canvas: Canvas) {
+        super.onDraw(canvas)
+
+        val cx = width / 2f
+        val cy = height / 2f
+        val size = minOf(width, height) * 0.4f
+
+        canvas.save()
+        canvas.rotate(rotationAngle, cx, cy)
+
+        // Draw arrow pointing up
+        arrowPath.reset()
+        arrowPath.moveTo(cx, cy - size)                     // tip
+        arrowPath.lineTo(cx + size * 0.5f, cy + size * 0.3f) // right
+        arrowPath.lineTo(cx + size * 0.15f, cy + size * 0.1f)
+        arrowPath.lineTo(cx + size * 0.15f, cy + size * 0.7f) // right tail
+        arrowPath.lineTo(cx - size * 0.15f, cy + size * 0.7f) // left tail
+        arrowPath.lineTo(cx - size * 0.15f, cy + size * 0.1f)
+        arrowPath.lineTo(cx - size * 0.5f, cy + size * 0.3f) // left
+        arrowPath.close()
+
+        canvas.drawPath(arrowPath, arrowPaint)
+        canvas.drawPath(arrowPath, outlinePaint)
+
+        canvas.restore()
+    }
+}
--- a/app/src/main/java/no/naiv/tilfluktsrom/ui/ShelterListAdapter.kt
+++ b/app/src/main/java/no/naiv/tilfluktsrom/ui/ShelterListAdapter.kt
@ -0,0 +1,77 @@
+package no.naiv.tilfluktsrom.ui
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
+import androidx.recyclerview.widget.RecyclerView
+import no.naiv.tilfluktsrom.R
+import no.naiv.tilfluktsrom.databinding.ItemShelterBinding
+import no.naiv.tilfluktsrom.location.ShelterWithDistance
+import no.naiv.tilfluktsrom.util.DistanceUtils
+
+/**
+ * Adapter for the list of nearest shelters shown in the bottom sheet.
+ */
+class ShelterListAdapter(
+    private val onShelterSelected: (ShelterWithDistance) -> Unit
+) : ListAdapter<ShelterWithDistance, ShelterListAdapter.ViewHolder>(DIFF_CALLBACK) {
+
+    private var selectedPosition = 0
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+        val binding = ItemShelterBinding.inflate(
+            LayoutInflater.from(parent.context), parent, false
+        )
+        return ViewHolder(binding)
+    }
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        holder.bind(getItem(position), position == selectedPosition)
+    }
+
+    fun selectPosition(position: Int) {
+        val old = selectedPosition
+        selectedPosition = position
+        notifyItemChanged(old)
+        notifyItemChanged(position)
+    }
+
+    inner class ViewHolder(
+        private val binding: ItemShelterBinding
+    ) : RecyclerView.ViewHolder(binding.root) {
+
+        fun bind(item: ShelterWithDistance, isSelected: Boolean) {
+            val ctx = binding.root.context
+            binding.shelterAddress.text = item.shelter.adresse
+            binding.shelterDistance.text = DistanceUtils.formatDistance(item.distanceMeters)
+            binding.shelterCapacity.text = ctx.getString(
+                R.string.shelter_capacity, item.shelter.plasser
+            )
+            binding.shelterRoomNr.text = ctx.getString(
+                R.string.shelter_room_nr, item.shelter.romnr
+            )
+
+            binding.root.isSelected = isSelected
+            binding.root.alpha = if (isSelected) 1.0f else 0.7f
+
+            binding.root.setOnClickListener {
+                val pos = adapterPosition
+                if (pos != RecyclerView.NO_POSITION) {
+                    selectPosition(pos)
+                    onShelterSelected(getItem(pos))
+                }
+            }
+        }
+    }
+
+    companion object {
+        private val DIFF_CALLBACK = object : DiffUtil.ItemCallback<ShelterWithDistance>() {
+            override fun areItemsTheSame(a: ShelterWithDistance, b: ShelterWithDistance) =
+                a.shelter.lokalId == b.shelter.lokalId
+
+            override fun areContentsTheSame(a: ShelterWithDistance, b: ShelterWithDistance) =
+                a == b
+        }
+    }
+}
--- a/app/src/main/java/no/naiv/tilfluktsrom/util/CoordinateConverter.kt
+++ b/app/src/main/java/no/naiv/tilfluktsrom/util/CoordinateConverter.kt
@ -0,0 +1,73 @@
+package no.naiv.tilfluktsrom.util
+
+import kotlin.math.*
+
+/**
+ * Converts UTM zone 33N (EPSG:25833) coordinates to WGS84 (EPSG:4326).
+ *
+ * The shelter data from Geonorge uses EUREF89 UTM zone 33N. EUREF89 is
+ * identical to WGS84 for all practical purposes (sub-meter difference).
+ *
+ * The conversion uses the Karney method (series expansion) for accuracy.
+ */
+object CoordinateConverter {
+
+    // WGS84 ellipsoid parameters
+    private const val A = 6378137.0              // semi-major axis (meters)
+    private const val F = 1.0 / 298.257223563    // flattening
+    private const val E2 = 2 * F - F * F         // eccentricity squared
+
+    // UTM parameters
+    private const val K0 = 0.9996                // scale factor
+    private const val FALSE_EASTING = 500000.0
+    private const val FALSE_NORTHING = 0.0       // northern hemisphere
+    private const val ZONE_33_CENTRAL_MERIDIAN = 15.0 // degrees
+
+    data class LatLon(val latitude: Double, val longitude: Double)
+
+    /**
+     * Convert UTM33N easting/northing to WGS84 latitude/longitude.
+     */
+    fun utm33nToWgs84(easting: Double, northing: Double): LatLon {
+        val x = easting - FALSE_EASTING
+        val y = northing - FALSE_NORTHING
+
+        val e1 = (1 - sqrt(1 - E2)) / (1 + sqrt(1 - E2))
+
+        val m = y / K0
+        val mu = m / (A * (1 - E2 / 4 - 3 * E2 * E2 / 64 - 5 * E2 * E2 * E2 / 256))
+
+        // Footprint latitude using series expansion
+        val phi1 = mu +
+            (3 * e1 / 2 - 27 * e1.pow(3) / 32) * sin(2 * mu) +
+            (21 * e1 * e1 / 16 - 55 * e1.pow(4) / 32) * sin(4 * mu) +
+            (151 * e1.pow(3) / 96) * sin(6 * mu) +
+            (1097 * e1.pow(4) / 512) * sin(8 * mu)
+
+        val sinPhi1 = sin(phi1)
+        val cosPhi1 = cos(phi1)
+        val tanPhi1 = tan(phi1)
+
+        val n1 = A / sqrt(1 - E2 * sinPhi1 * sinPhi1)
+        val t1 = tanPhi1 * tanPhi1
+        val c1 = (E2 / (1 - E2)) * cosPhi1 * cosPhi1
+        val r1 = A * (1 - E2) / (1 - E2 * sinPhi1 * sinPhi1).pow(1.5)
+        val d = x / (n1 * K0)
+
+        val lat = phi1 - (n1 * tanPhi1 / r1) * (
+            d * d / 2 -
+            (5 + 3 * t1 + 10 * c1 - 4 * c1 * c1 - 9 * E2 / (1 - E2)) * d.pow(4) / 24 +
+            (61 + 90 * t1 + 298 * c1 + 45 * t1 * t1 - 252 * E2 / (1 - E2) - 3 * c1 * c1) * d.pow(6) / 720
+        )
+
+        val lon = (d -
+            (1 + 2 * t1 + c1) * d.pow(3) / 6 +
+            (5 - 2 * c1 + 28 * t1 - 3 * c1 * c1 + 8 * E2 / (1 - E2) + 24 * t1 * t1) * d.pow(5) / 120
+        ) / cosPhi1
+
+        return LatLon(
+            latitude = Math.toDegrees(lat),
+            longitude = ZONE_33_CENTRAL_MERIDIAN + Math.toDegrees(lon)
+        )
+    }
+}
--- a/app/src/main/java/no/naiv/tilfluktsrom/util/DistanceUtils.kt
+++ b/app/src/main/java/no/naiv/tilfluktsrom/util/DistanceUtils.kt
@ -0,0 +1,47 @@
+package no.naiv.tilfluktsrom.util
+
+import kotlin.math.*
+
+/**
+ * Distance and bearing calculations using the Haversine formula.
+ */
+object DistanceUtils {
+
+    private const val EARTH_RADIUS_METERS = 6371000.0
+
+    /**
+     * Calculate the distance in meters between two WGS84 points.
+     */
+    fun distanceMeters(lat1: Double, lon1: Double, lat2: Double, lon2: Double): Double {
+        val dLat = Math.toRadians(lat2 - lat1)
+        val dLon = Math.toRadians(lon2 - lon1)
+        val a = sin(dLat / 2).pow(2) +
+            cos(Math.toRadians(lat1)) * cos(Math.toRadians(lat2)) *
+            sin(dLon / 2).pow(2)
+        return EARTH_RADIUS_METERS * 2 * atan2(sqrt(a), sqrt(1 - a))
+    }
+
+    /**
+     * Calculate the initial bearing (in degrees, 0=north, clockwise)
+     * from point 1 to point 2.
+     */
+    fun bearingDegrees(lat1: Double, lon1: Double, lat2: Double, lon2: Double): Double {
+        val phi1 = Math.toRadians(lat1)
+        val phi2 = Math.toRadians(lat2)
+        val dLambda = Math.toRadians(lon2 - lon1)
+        val y = sin(dLambda) * cos(phi2)
+        val x = cos(phi1) * sin(phi2) - sin(phi1) * cos(phi2) * cos(dLambda)
+        return (Math.toDegrees(atan2(y, x)) + 360) % 360
+    }
+
+    /**
+     * Format distance for display: meters if <1km, otherwise km with one decimal.
+     */
+    fun formatDistance(meters: Double): String {
+        return if (meters < 1000) {
+            "${meters.toInt()} m"
+        } else {
+            "${"%.1f".format(meters / 1000)} km"
+        }
+    }
+}
--- a/app/src/main/res/drawable/ic_compass.xml
+++ b/app/src/main/res/drawable/ic_compass.xml
@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M12,2 C6.48,2 2,6.48 2,12 C2,17.52 6.48,22 12,22 C17.52,22 22,17.52 22,12 C22,6.48 17.52,2 12,2 Z M12,20 C7.59,20 4,16.41 4,12 C4,7.59 7.59,4 12,4 C16.41,4 20,7.59 20,12 C20,16.41 16.41,20 12,20 Z" />
+
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M14.5,12 L12,2 L9.5,12 L12,22 Z" />
+
+    <path
+        android:fillColor="#CCFFFFFF"
+        android:pathData="M12,2 L14.5,12 L12,22 Z" />
+</vector>
--- a/app/src/main/res/drawable/ic_launcher_background.xml
+++ b/app/src/main/res/drawable/ic_launcher_background.xml
@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+
+    <path
+        android:fillColor="#1A1A2E"
+        android:pathData="M0,0 L108,0 L108,108 L0,108 Z" />
+</vector>
--- a/app/src/main/res/drawable/ic_launcher_foreground.xml
+++ b/app/src/main/res/drawable/ic_launcher_foreground.xml
@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+
+    <!-- Shelter shield icon centered in adaptive icon safe zone -->
+    <path
+        android:fillColor="#FF6B35"
+        android:pathData="M54,24 L30,36 L30,54 C30,70 39,83 54,87 C69,83 78,70 78,54 L78,36 Z" />
+
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M51,42 L57,42 L57,51 L66,51 L66,57 L57,57 L57,66 L51,66 L51,57 L42,57 L42,51 L51,51 Z" />
+</vector>
--- a/app/src/main/res/drawable/ic_map.xml
+++ b/app/src/main/res/drawable/ic_map.xml
@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M20.5,3 L20.34,3.03 L15,5.1 L9,3 L3.36,4.9 C3.15,4.97 3,5.15 3,5.38 L3,20.5 C3,20.78 3.22,21 3.5,21 L3.66,20.97 L9,18.9 L15,21 L20.64,19.1 C20.85,19.03 21,18.85 21,18.62 L21,3.5 C21,3.22 20.78,3 20.5,3 Z M15,19 L9,16.89 L9,5 L15,7.11 Z" />
+</vector>
--- a/app/src/main/res/drawable/ic_refresh.xml
+++ b/app/src/main/res/drawable/ic_refresh.xml
@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M17.65,6.35 C16.2,4.9 14.21,4 12,4 C7.58,4 4.01,7.58 4.01,12 C4.01,16.42 7.58,20 12,20 C15.73,20 18.84,17.45 19.73,14 L17.65,14 C16.83,16.33 14.61,18 12,18 C8.69,18 6,15.31 6,12 C6,8.69 8.69,6 12,6 C13.66,6 15.14,6.69 16.22,7.78 L13,11 L20,11 L20,4 Z" />
+</vector>
--- a/app/src/main/res/drawable/ic_shelter.xml
+++ b/app/src/main/res/drawable/ic_shelter.xml
@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Shelter marker icon: a shield/bunker symbol -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+
+    <!-- Shield body -->
+    <path
+        android:fillColor="#FF6B35"
+        android:pathData="M12,2 L3,7 L3,12 C3,17.5 6.8,22.7 12,24 C17.2,22.7 21,17.5 21,12 L21,7 Z" />
+
+    <!-- Inner cross/plus symbol for shelter -->
+    <path
+        android:fillColor="#FFFFFF"
+        android:pathData="M11,8 L13,8 L13,11 L16,11 L16,13 L13,13 L13,16 L11,16 L11,13 L8,13 L8,11 L11,11 Z" />
+</vector>
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@ -0,0 +1,192 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/background"
+    tools:context=".MainActivity">
+
+    <!-- Status bar at top -->
+    <LinearLayout
+        android:id="@+id/statusBar"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:background="@color/status_bar_bg"
+        android:gravity="center_vertical"
+        android:orientation="horizontal"
+        android:padding="8dp"
+        app:layout_constraintTop_toTopOf="parent">
+
+        <TextView
+            android:id="@+id/statusText"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:textColor="@color/status_text"
+            android:textSize="12sp"
+            tools:text="@string/status_ready" />
+
+        <ImageButton
+            android:id="@+id/refreshButton"
+            android:layout_width="36dp"
+            android:layout_height="36dp"
+            android:background="?attr/selectableItemBackgroundBorderless"
+            android:contentDescription="@string/action_refresh"
+            android:src="@drawable/ic_refresh"
+            app:tint="@color/status_text" />
+    </LinearLayout>
+
+    <!-- Map view (main content) -->
+    <org.osmdroid.views.MapView
+        android:id="@+id/mapView"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintTop_toBottomOf="@id/statusBar"
+        app:layout_constraintBottom_toTopOf="@id/bottomSheet" />
+
+    <!-- Direction arrow overlay (shown when toggled) -->
+    <FrameLayout
+        android:id="@+id/compassContainer"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:background="@color/compass_bg"
+        android:visibility="gone"
+        app:layout_constraintTop_toBottomOf="@id/statusBar"
+        app:layout_constraintBottom_toTopOf="@id/bottomSheet">
+
+        <no.naiv.tilfluktsrom.ui.DirectionArrowView
+            android:id="@+id/directionArrow"
+            android:layout_width="match_parent"
+            android:layout_height="match_parent" />
+
+        <TextView
+            android:id="@+id/compassDistanceText"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="bottom|center_horizontal"
+            android:layout_marginBottom="32dp"
+            android:textColor="@color/white"
+            android:textSize="48sp"
+            android:textStyle="bold"
+            tools:text="1.2 km" />
+
+        <TextView
+            android:id="@+id/compassAddressText"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="top|center_horizontal"
+            android:layout_marginTop="24dp"
+            android:textAlignment="center"
+            android:textColor="@color/white"
+            android:textSize="18sp"
+            tools:text="Storgata 1" />
+    </FrameLayout>
+
+    <!-- Toggle button: map <-> compass -->
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
+        android:id="@+id/toggleViewFab"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_margin="16dp"
+        android:contentDescription="@string/action_toggle_view"
+        android:src="@drawable/ic_compass"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintBottom_toTopOf="@id/bottomSheet"
+        app:backgroundTint="@color/shelter_primary"
+        app:tint="@color/white" />
+
+    <!-- Bottom sheet with shelter info -->
+    <LinearLayout
+        android:id="@+id/bottomSheet"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:background="@color/bottom_sheet_bg"
+        android:orientation="vertical"
+        android:padding="12dp"
+        android:elevation="8dp"
+        app:layout_constraintBottom_toBottomOf="parent">
+
+        <!-- Selected shelter summary -->
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:gravity="center_vertical"
+            android:orientation="horizontal">
+
+            <no.naiv.tilfluktsrom.ui.DirectionArrowView
+                android:id="@+id/miniArrow"
+                android:layout_width="48dp"
+                android:layout_height="48dp" />
+
+            <LinearLayout
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:layout_marginStart="12dp"
+                android:orientation="vertical">
+
+                <TextView
+                    android:id="@+id/selectedShelterAddress"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:textColor="@color/text_primary"
+                    android:textSize="16sp"
+                    android:textStyle="bold"
+                    tools:text="Storgata 1" />
+
+                <TextView
+                    android:id="@+id/selectedShelterDetails"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:textColor="@color/text_secondary"
+                    android:textSize="13sp"
+                    tools:text="1.2 km - 400 plasser - Rom 776" />
+            </LinearLayout>
+        </LinearLayout>
+
+        <!-- Nearest shelters list -->
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/shelterList"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="8dp"
+            android:clipToPadding="false" />
+    </LinearLayout>
+
+    <!-- Loading overlay for initial data download -->
+    <FrameLayout
+        android:id="@+id/loadingOverlay"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="@color/loading_bg"
+        android:clickable="true"
+        android:focusable="true"
+        android:visibility="gone">
+
+        <LinearLayout
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center"
+            android:gravity="center"
+            android:orientation="vertical">
+
+            <ProgressBar
+                android:id="@+id/loadingProgress"
+                android:layout_width="64dp"
+                android:layout_height="64dp"
+                android:indeterminate="true" />
+
+            <TextView
+                android:id="@+id/loadingText"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="16dp"
+                android:textColor="@color/white"
+                android:textSize="16sp"
+                tools:text="@string/loading_shelters" />
+        </LinearLayout>
+    </FrameLayout>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
--- a/app/src/main/res/layout/item_shelter.xml
+++ b/app/src/main/res/layout/item_shelter.xml
@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="?attr/selectableItemBackground"
+    android:orientation="vertical"
+    android:paddingHorizontal="12dp"
+    android:paddingVertical="8dp">
+
+    <TextView
+        android:id="@+id/shelterAddress"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:textColor="@color/text_primary"
+        android:textSize="14sp"
+        android:textStyle="bold"
+        tools:text="Storgata 1 - Bunker (off)" />
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal">
+
+        <TextView
+            android:id="@+id/shelterDistance"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textColor="@color/shelter_primary"
+            android:textSize="13sp"
+            android:textStyle="bold"
+            tools:text="1.2 km" />
+
+        <TextView
+            android:id="@+id/shelterCapacity"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="12dp"
+            android:textColor="@color/text_secondary"
+            android:textSize="12sp"
+            tools:text="400 plasser" />
+
+        <TextView
+            android:id="@+id/shelterRoomNr"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="12dp"
+            android:textColor="@color/text_secondary"
+            android:textSize="12sp"
+            tools:text="Rom 776" />
+    </LinearLayout>
+
+</LinearLayout>
--- a/app/src/main/res/mipmap-hdpi/ic_launcher.xml
+++ b/app/src/main/res/mipmap-hdpi/ic_launcher.xml
@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
--- a/app/src/main/res/mipmap-xhdpi/ic_launcher.xml
+++ b/app/src/main/res/mipmap-xhdpi/ic_launcher.xml
@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
--- a/app/src/main/res/mipmap-xxhdpi/ic_launcher.xml
+++ b/app/src/main/res/mipmap-xxhdpi/ic_launcher.xml
@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
--- a/app/src/main/res/mipmap-xxxhdpi/ic_launcher.xml
+++ b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.xml
@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
--- a/app/src/main/res/values-nb/strings.xml
+++ b/app/src/main/res/values-nb/strings.xml
@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Tilfluktsrom</string>
+
+    <!-- Statusmeldinger -->
+    <string name="status_ready">Klar</string>
+    <string name="status_loading">Laster tilfluktsromdata&#8230;</string>
+    <string name="status_updating">Oppdaterer&#8230;</string>
+    <string name="status_offline">Frakoblet modus</string>
+    <string name="status_shelters_loaded">%d tilfluktsrom lastet</string>
+    <string name="status_no_location">Venter på GPS&#8230;</string>
+    <string name="status_caching_map">Lagrer kart for frakoblet bruk&#8230;</string>
+
+    <!-- Lasteskjerm -->
+    <string name="loading_shelters">Laster ned tilfluktsromdata&#8230;</string>
+    <string name="loading_map">Lagrer kartfliser&#8230;</string>
+    <string name="loading_first_time">Gjør klar for første gangs bruk&#8230;</string>
+
+    <!-- Tilfluktsrominfo -->
+    <string name="shelter_capacity">%d plasser</string>
+    <string name="shelter_room_nr">Rom %d</string>
+    <string name="nearest_shelter">Nærmeste tilfluktsrom</string>
+    <string name="no_shelters">Ingen tilfluktsromdata tilgjengelig</string>
+
+    <!-- Handlinger -->
+    <string name="action_refresh">Oppdater data</string>
+    <string name="action_toggle_view">Bytt mellom kart og kompassvisning</string>
+
+    <!-- Tillatelser -->
+    <string name="permission_location_title">Posisjonstillatelse kreves</string>
+    <string name="permission_location_message">Denne appen trenger din posisjon for å finne nærmeste tilfluktsrom. Vennligst gi tilgang til posisjon.</string>
+    <string name="permission_denied">Posisjonstillatelse avslått. Appen kan ikke finne tilfluktsrom i nærheten uten den.</string>
+
+    <!-- Feil -->
+    <string name="error_download_failed">Kunne ikke laste ned tilfluktsromdata. Sjekk internettforbindelsen.</string>
+    <string name="error_no_data_offline">Ingen lagrede data tilgjengelig. Koble til internett for å laste ned tilfluktsromdata.</string>
+    <string name="update_success">Tilfluktsromdata oppdatert</string>
+    <string name="update_failed">Oppdatering mislyktes — bruker lagrede data</string>
+</resources>
--- a/app/src/main/res/values-nn/strings.xml
+++ b/app/src/main/res/values-nn/strings.xml
@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Tilfluktsrom</string>
+
+    <!-- Statusmeldingar -->
+    <string name="status_ready">Klar</string>
+    <string name="status_loading">Lastar tilfluktsromdata&#8230;</string>
+    <string name="status_updating">Oppdaterer&#8230;</string>
+    <string name="status_offline">Fråkopla modus</string>
+    <string name="status_shelters_loaded">%d tilfluktsrom lasta</string>
+    <string name="status_no_location">Ventar på GPS&#8230;</string>
+    <string name="status_caching_map">Lagrar kart for fråkopla bruk&#8230;</string>
+
+    <!-- Lasteskjerm -->
+    <string name="loading_shelters">Lastar ned tilfluktsromdata&#8230;</string>
+    <string name="loading_map">Lagrar kartfliser&#8230;</string>
+    <string name="loading_first_time">Gjer klar for fyrste gongs bruk&#8230;</string>
+
+    <!-- Tilfluktsrominfo -->
+    <string name="shelter_capacity">%d plassar</string>
+    <string name="shelter_room_nr">Rom %d</string>
+    <string name="nearest_shelter">Næraste tilfluktsrom</string>
+    <string name="no_shelters">Ingen tilfluktsromdata tilgjengeleg</string>
+
+    <!-- Handlingar -->
+    <string name="action_refresh">Oppdater data</string>
+    <string name="action_toggle_view">Byt mellom kart og kompassvising</string>
+
+    <!-- Løyve -->
+    <string name="permission_location_title">Posisjonsløyve krevst</string>
+    <string name="permission_location_message">Denne appen treng posisjonen din for å finne næraste tilfluktsrom. Ver venleg og gje tilgang til posisjon.</string>
+    <string name="permission_denied">Posisjonsløyve avslått. Appen kan ikkje finne tilfluktsrom i nærleiken utan det.</string>
+
+    <!-- Feil -->
+    <string name="error_download_failed">Kunne ikkje laste ned tilfluktsromdata. Sjekk internettilkoplinga.</string>
+    <string name="error_no_data_offline">Ingen lagra data tilgjengeleg. Kopla til internett for å laste ned tilfluktsromdata.</string>
+    <string name="update_success">Tilfluktsromdata oppdatert</string>
+    <string name="update_failed">Oppdatering mislukkast — brukar lagra data</string>
+</resources>
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Emergency-themed color palette: high contrast, easily visible -->
+    <color name="shelter_primary">#FF6B35</color>
+    <color name="shelter_primary_dark">#E55A2B</color>
+    <color name="shelter_accent">#FFC107</color>
+
+    <color name="background">#1A1A2E</color>
+    <color name="status_bar_bg">#16213E</color>
+    <color name="status_text">#B0BEC5</color>
+    <color name="bottom_sheet_bg">#1A1A2E</color>
+    <color name="compass_bg">#0F0F23</color>
+    <color name="loading_bg">#CC000000</color>
+
+    <color name="text_primary">#ECEFF1</color>
+    <color name="text_secondary">#90A4AE</color>
+
+    <color name="white">#FFFFFF</color>
+    <color name="black">#000000</color>
+</resources>
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Tilfluktsrom</string>
+
+    <!-- Status messages -->
+    <string name="status_ready">Ready</string>
+    <string name="status_loading">Loading shelter data&#8230;</string>
+    <string name="status_updating">Updating&#8230;</string>
+    <string name="status_offline">Offline mode</string>
+    <string name="status_shelters_loaded">%d shelters loaded</string>
+    <string name="status_no_location">Waiting for GPS&#8230;</string>
+    <string name="status_caching_map">Caching map for offline use&#8230;</string>
+
+    <!-- Loading screen -->
+    <string name="loading_shelters">Downloading shelter data&#8230;</string>
+    <string name="loading_map">Caching map tiles&#8230;</string>
+    <string name="loading_first_time">Setting up for first use&#8230;</string>
+
+    <!-- Shelter info -->
+    <string name="shelter_capacity">%d places</string>
+    <string name="shelter_room_nr">Room %d</string>
+    <string name="nearest_shelter">Nearest shelter</string>
+    <string name="no_shelters">No shelter data available</string>
+
+    <!-- Actions -->
+    <string name="action_refresh">Refresh data</string>
+    <string name="action_toggle_view">Toggle map/compass view</string>
+
+    <!-- Permissions -->
+    <string name="permission_location_title">Location permission required</string>
+    <string name="permission_location_message">This app needs your location to find the nearest shelter. Please grant location access.</string>
+    <string name="permission_denied">Location permission denied. The app cannot find nearby shelters without it.</string>
+
+    <!-- Errors -->
+    <string name="error_download_failed">Could not download shelter data. Check your internet connection.</string>
+    <string name="error_no_data_offline">No cached data available. Connect to the internet to download shelter data.</string>
+    <string name="update_success">Shelter data updated</string>
+    <string name="update_failed">Update failed — using cached data</string>
+</resources>
--- a/app/src/main/res/values/themes.xml
+++ b/app/src/main/res/values/themes.xml
@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="Theme.Tilfluktsrom" parent="Theme.Material3.DayNight.NoActionBar">
+        <item name="colorPrimary">@color/shelter_primary</item>
+        <item name="colorPrimaryDark">@color/shelter_primary_dark</item>
+        <item name="colorAccent">@color/shelter_accent</item>
+        <item name="android:windowBackground">@color/background</item>
+        <item name="android:statusBarColor">@color/status_bar_bg</item>
+        <item name="android:navigationBarColor">@color/background</item>
+    </style>
+</resources>
--- a/app/src/main/res/xml/network_security_config.xml
+++ b/app/src/main/res/xml/network_security_config.xml
@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<network-security-config>
+    <!-- Allow cleartext for OSMDroid tile servers that may use HTTP -->
+    <domain-config cleartextTrafficPermitted="true">
+        <domain includeSubdomains="true">tile.openstreetmap.org</domain>
+    </domain-config>
+</network-security-config>