diff --git a/android/app/src/main/kotlin/dev/fiatcode/tracpulse/service/LocationTrackingService.kt b/android/app/src/main/kotlin/dev/fiatcode/tracpulse/service/LocationTrackingService.kt
index 282602b..00834c0 100644
--- a/android/app/src/main/kotlin/dev/fiatcode/tracpulse/service/LocationTrackingService.kt
+++ b/android/app/src/main/kotlin/dev/fiatcode/tracpulse/service/LocationTrackingService.kt
@@ -256,7 +256,7 @@ class LocationTrackingService : Service() {
             isMoving = (nativeSpeed ?: 0f) > 1.0f
         )
 
-        logEvent("LOCATION", "Lat: ${location.latitude}, Lon: ${location.longitude}, Speed: ${location.speed}")
+        logEvent("LOCATION", "Lat: ${location.latitude}, Lon: ${location.longitude}, Speed: ${location.speed} (native)")
 
         updateNotification(location)
 
@@ -326,7 +326,8 @@ class LocationTrackingService : Service() {
             logEvent("SPEED_CALC", "Speed calculation failed - sending without speed")
             // Fallback: send location without speed rather than losing it
         } else {
-            logEvent("LOCATION", "Lat: ${location.latitude}, Lon: ${location.longitude}, Calc Speed: ${finalSpeed}")
+            val speedSource = if (location.hasSpeed() && location.speed > 0) "native" else "calculated"
+            logEvent("LOCATION", "Lat: ${location.latitude}, Lon: ${location.longitude}, Speed: ${finalSpeed} ($speedSource)")
         }
 
         val speedToSend = if (finalSpeed != null && finalSpeed > 0) finalSpeed else null