I'm a user in mainland China. I use the built-in Workout app on my Apple Watch Series 11 (watchOS 27 beta 3) to record outdoor and indoor workouts, and then view the workout data in the built-in Fitness app on my iPhone Air (iOS 27 beta 3). I've noticed that the marker points on the route map are offset — they deviate from the actual location by several hundred meters, ending up in the middle of a river.
Note: This looks like a GCJ-02 coordinate conversion issue. In mainland China, map providers are required to use the GCJ-02 datum, and GPS (WGS-84) coordinates must be converted before being displayed on the map. The offset pattern (several hundred meters) is consistent with WGS-84 coordinates being rendered on a GCJ-02 map without conversion, or a double conversion.
I've filed this via Feedback Assistant: FB23716158. Happy to provide a sysdiagnose or sample workout data if needed
