fix: Tame rapid GPS updates #41

lib/screens/settings_screen.dart

@@ -341,7 +341,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
           keyboardType: const TextInputType.numberWithOptions(decimal: true),
           decoration: const InputDecoration(
             labelText: 'Meters',
-            helperText: 'Valid range: 1 to 1000 meters',
+            helperText: 'Valid range: 10 to 1000 meters',
           ),
         ),
         actions: [
@@ -353,7 +353,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
             onPressed: () {
               final parsed = double.tryParse(controller.text.trim());
               if (parsed == null) return;
-              Navigator.pop(context, parsed.clamp(1.0, 1000.0));
+              Navigator.pop(context, parsed.clamp(10.0, 1000.0));
             },
             child: const Text('Save'),
           ),
@@ -382,7 +382,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
           keyboardType: TextInputType.number,
           decoration: const InputDecoration(
             labelText: 'Seconds',
-            helperText: 'Valid range: 5 to 60 seconds',
+            helperText: 'Valid range: 10 to 31 seconds',
           ),
         ),
         actions: [
@@ -394,7 +394,7 @@ class _SettingsScreenState extends State<SettingsScreen> {
             onPressed: () {
               final parsed = int.tryParse(controller.text.trim());
               if (parsed == null) return;
-              Navigator.pop(context, parsed.clamp(5, 60));
+              Navigator.pop(context, parsed.clamp(10, 31));
             },
             child: const Text('Save'),
           ),

lib/services/app_config_snapshot_service.dart

@@ -144,11 +144,11 @@ class AppConfigSnapshotService {
     }
     if (section.fastLocationMovementThresholdMeters != null) {
       locationTracking.fastLocationMovementThresholdMeters =
-          section.fastLocationMovementThresholdMeters!;
+          section.fastLocationMovementThresholdMeters!.clamp(10.0, 1000.0);
     }
     if (section.fastLocationActiveCadenceSeconds != null) {
       locationTracking.fastLocationActiveCadenceSeconds =
-          section.fastLocationActiveCadenceSeconds!;
+          section.fastLocationActiveCadenceSeconds!.clamp(10, 31);
     }
     await locationTracking.saveSettings();
     await appProvider.reloadProfileScopedSettings();

lib/services/location_tracking_service.dart

@@ -20,6 +20,14 @@ import 'profiles_feature_service.dart';
 /// - MeshCore mesh network integration
 /// - Real-time position updates via callbacks
 class LocationTrackingService {
+  static const double _defaultFastLocationMovementThresholdMeters = 10.0;
+  static const double _minFastLocationMovementThresholdMeters = 10.0;
+  static const int _defaultFastLocationActiveCadenceSeconds = 10;
+  static const int _minFastLocationActiveCadenceSeconds = 10;
+  static const int _maxFastLocationActiveCadenceSeconds = 31;
+  static const Duration _fastLocationMinimumUpdateInterval = Duration(
+    seconds: 31,
+  );
   // ============================================================================
   // Singleton Pattern
   // ============================================================================
@@ -75,10 +83,12 @@ class LocationTrackingService {
   bool fastLocationUpdatesEnabled = false;
 
   /// Distance threshold for fast GPS updates
-  double fastLocationMovementThresholdMeters = 10.0;
+  double fastLocationMovementThresholdMeters =
+      _defaultFastLocationMovementThresholdMeters;
 
   /// Cadence for active-use fast GPS updates
-  int fastLocationActiveCadenceSeconds = 10;
+  int fastLocationActiveCadenceSeconds =
+      _defaultFastLocationActiveCadenceSeconds;
 
   /// Target channel index for fast GPS updates; null means disabled/unset.
   int? fastLocationChannelIdx;
@@ -522,12 +532,18 @@ class LocationTrackingService {
   }
 
   Future<void> updateFastLocationMovementThreshold(double meters) async {
-    fastLocationMovementThresholdMeters = meters.clamp(1.0, 1000.0);
+    fastLocationMovementThresholdMeters = meters.clamp(
+      _minFastLocationMovementThresholdMeters,
+      1000.0,
+    );
     await saveSettings();
   }
 
   Future<void> updateFastLocationActiveCadenceSeconds(int seconds) async {
-    fastLocationActiveCadenceSeconds = seconds.clamp(5, 60);
+    fastLocationActiveCadenceSeconds = seconds.clamp(
+      _minFastLocationActiveCadenceSeconds,
+      _maxFastLocationActiveCadenceSeconds,
+    );
     await saveSettings();
     _refreshFastLocationTimer();
   }
@@ -583,6 +599,11 @@ class LocationTrackingService {
     final now = DateTime.now();
     final previous = _lastFastLocationSentPosition;
     final previousTime = _lastFastLocationSentAt;
+    if (previousTime != null &&
+        now.difference(previousTime) < _fastLocationMinimumUpdateInterval) {
+      return;
+    }
+
     if (previous != null && previousTime != null) {
       final distance = Geolocator.distanceBetween(
         previous.latitude,
@@ -673,12 +694,14 @@ class LocationTrackingService {
         prefs.getBool(_scopedKey(_prefKeyFastLocationEnabled)) ?? false;
     fastLocationMovementThresholdMeters =
         (prefs.getDouble(_scopedKey(_prefKeyFastMovementThreshold)) ??
-                gpsUpdateDistance)
+                _defaultFastLocationMovementThresholdMeters)
-            .clamp(1.0, 1000.0);
+            .clamp(_minFastLocationMovementThresholdMeters, 1000.0);
     fastLocationActiveCadenceSeconds =
-        (prefs.getInt(_scopedKey(_prefKeyFastActiveCadence)) ?? 10).clamp(
+        (prefs.getInt(_scopedKey(_prefKeyFastActiveCadence)) ??
-          5,
+                _defaultFastLocationActiveCadenceSeconds)
-          60,
+            .clamp(
+          _minFastLocationActiveCadenceSeconds,
+          _maxFastLocationActiveCadenceSeconds,
         );
     fastLocationChannelIdx = prefs.getInt(_scopedKey(_prefKeyFastChannelIdx));
 

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 2026.0323.1+40
+version: 2026.0323.2+41
 
 environment:
   sdk: ^3.9.2

test/services/location_tracking_service_test.dart

@@ -19,6 +19,13 @@ void main() {
     service.fastLocationChannelIdx = null;
   });
 
+  test('loads conservative fast location defaults', () async {
+    await service.loadSettings();
+
+    expect(service.fastLocationMovementThresholdMeters, 10.0);
+    expect(service.fastLocationActiveCadenceSeconds, 10);
+  });
+
   test('persists and restores fast location channel idx', () async {
     await service.updateFastLocationChannelIdx(3);
 
@@ -37,4 +44,12 @@ void main() {
 
     expect(service.fastLocationChannelIdx, isNull);
   });
+
+  test('clamps fast location settings to conservative limits', () async {
+    await service.updateFastLocationMovementThreshold(3);
+    await service.updateFastLocationActiveCadenceSeconds(45);
+
+    expect(service.fastLocationMovementThresholdMeters, 10.0);
+    expect(service.fastLocationActiveCadenceSeconds, 31);
+  });
 }