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mobile/lib/models/gps_coordinate.dart

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+/// نموذج بيانات إحداثية GPS
+/// يمثل نقطة واحدة مع بيانات الارتفاع والدقة والسرعة
+class GpsCoordinate {
+  final double latitude;
+  final double longitude;
+  final double? altitude;
+  final double? accuracy;
+  final double? speed; // m/s from GPS sensor
+  final double? heading; // degrees from north
+  final DateTime timestamp;
+
+  GpsCoordinate({
+    required this.latitude,
+    required this.longitude,
+    this.altitude,
+    this.accuracy,
+    this.speed,
+    this.heading,
+    required this.timestamp,
+  });
+
+  Map<String, dynamic> toMap() {
+    return {
+      'latitude': latitude,
+      'longitude': longitude,
+      'altitude': altitude,
+      'accuracy': accuracy,
+      'speed': speed,
+      'heading': heading,
+      'timestamp': timestamp.toIso8601String(),
+    };
+  }
+
+  factory GpsCoordinate.fromMap(Map<String, dynamic> map) {
+    return GpsCoordinate(
+      latitude: (map['latitude'] as num).toDouble(),
+      longitude: (map['longitude'] as num).toDouble(),
+      altitude: map['altitude'] != null
+          ? (map['altitude'] as num).toDouble()
+          : null,
+      accuracy: map['accuracy'] != null
+          ? (map['accuracy'] as num).toDouble()
+          : null,
+      speed:
+          map['speed'] != null ? (map['speed'] as num).toDouble() : null,
+      heading: map['heading'] != null
+          ? (map['heading'] as num).toDouble()
+          : null,
+      timestamp: DateTime.parse(map['timestamp'] as String),
+    );
+  }
+
+  /// Check if this coordinate has acceptable accuracy for tracking
+  bool get isAccurate => accuracy != null && accuracy! <= 25.0;
+
+  /// Check if this is a valid GPS coordinate
+  bool get isValid =>
+      latitude >= -90 &&
+      latitude <= 90 &&
+      longitude >= -180 &&
+      longitude <= 180;
+
+  @override
+  String toString() =>
+      'GpsCoordinate(lat: $latitude, lng: $longitude, alt: $altitude, spd: $speed)';
+}