For your problem, you can refer to the following information:
1. Please make sure you are exercising outdoors. When the surrounding environment is complex (high buildings, lakes, etc.), positioning will be slightly slower. It is recommended to restart positioning in an open environment;
2. If it has been a long time since the last outdoor exercise, the ephemeris data will expire. It is recommended to open the [Mi Fitness] APP, reconnect the watch and refresh it synchronously, which will improve the GPS positioning speed;
3. In indoor, underground, tunnel, indoor swimming pool, indoor stadium and other similar environments, the watch is currently unable to perform positioning.