diff --git a/App/MapViewRepresentable.swift b/App/MapViewRepresentable.swift
index 48ebe84..cc5b5a4 100644
--- a/App/MapViewRepresentable.swift
+++ b/App/MapViewRepresentable.swift
@@ -260,9 +260,25 @@ struct MapViewRepresentable: UIViewRepresentable {
             parent.onViewportChanged(distance)
             zoomLabel?.text = MapZoomMath.viewportScaleLabel(distanceMeters: distance)
             updatePinPosition(on: mapView)
-            // 根据地图中心坐标地理位置判断瓦片类型（中国境内=GCJ-02，境外=WGS-84）
-            let c = mapView.centerCoordinate
-            CoordinateConverter.updateTileType(lat: c.latitude, lon: c.longitude)
+            // 推算瓦片类型：比较地图中心与蓝点的偏移
+            // 蓝点是 WGS-84，地图中心在 GCJ-02 瓦片上会有 ~596m 偏移
+            let mc = mapView.centerCoordinate
+            if let bl = mapView.userLocation.location?.coordinate {
+                let wgs = CoordinateConverter.gcj02ToWgs84(lat: mc.latitude, lon: mc.longitude)
+                let dGCJ = CoordinateConverter.distance(lat1: wgs.lat, lon1: wgs.lon, lat2: bl.latitude, lon2: bl.longitude)
+                let dRaw = CoordinateConverter.distance(lat1: mc.latitude, lon1: mc.longitude, lat2: bl.latitude, lon2: bl.longitude)
+                // GCJ→WGS 后更接近蓝点 = 地图是 GCJ-02；原始更接近 = 地图是 WGS-84
+                let type: CoordinateConverter.CoordType = dGCJ < dRaw ? .gcj02 : .wgs84
+                if type != CoordinateConverter.currentTileType {
+                    CoordinateConverter.currentTileType = type
+                    RuntimeLogger.info("APP", "坐标转换", "推算瓦片 → \(type.rawValue)", details: [
+                        "dGCJ": String(format: "%.0fm", dGCJ), "dRaw": String(format: "%.0fm", dRaw)
+                    ])
+                }
+            } else {
+                // 无蓝点，用坐标地理边界兜底
+                CoordinateConverter.updateTileType(lat: mc.latitude, lon: mc.longitude)
+            }
             // 同步蓝点坐标（避免 delegate 更新不及时导致 mapState.realtimeLocation 为 nil）
             if let ul = mapView.userLocation.location,
                CLLocationCoordinate2DIsValid(ul.coordinate), ul.horizontalAccuracy >= 0 {