assets/static/index.html

@@ -413,6 +413,7 @@
                 <div class="radar3d-controls">
                     <button id="radar3d-reset" disabled>Reset View</button>
                     <button id="radar3d-auto-rotate" disabled>Auto Rotate</button>
+                    <button id="radar3d-trails" disabled>Show Trails</button>
                     <label>
                         <input type="range" id="radar3d-range" min="10" max="500" value="100" disabled>
                         Range: <span id="radar3d-range-value">100</span> km

internal/merger/merger.go

@@ -230,6 +230,7 @@ type PositionPoint struct {
 	Time      time.Time `json:"time"`     // Timestamp when position was received
 	Latitude  float64   `json:"lat"`      // Latitude in decimal degrees
 	Longitude float64   `json:"lon"`      // Longitude in decimal degrees
+	Altitude  int       `json:"altitude"` // Altitude in feet (0 if unknown)
 	Source    string    `json:"source"`   // Source that provided this position
 }
 
@@ -655,6 +656,7 @@ func (m *Merger) updateHistories(state *AircraftState, aircraft *modes.Aircraft,
 				Time:      timestamp,
 				Latitude:  aircraft.Latitude,
 				Longitude: aircraft.Longitude,
+				Altitude:  aircraft.Altitude, // Include altitude in position history
 				Source:    sourceID,
 			})
 		}