Inaccurate outdoor sports distance/No track for outdoor sports

1. The watch itself does not have GPS, and outdoor sports need to keep the connection with the app all the time. In order to keep the connection all the time, it is necessary to keep the black plus app in the active state without being terminated by the system: enter the black plus app - my - background operation, select the corresponding mobile phone model, and open the permission according to the instructions
2. The mobile phone should turn on GPS positioning to keep the network unblocked
3. Black add app positioning permission is enabled and set to [always]
4. Weak GPS signal (indoor, high-rise building, underground passage)
5. When moving without turning on GPS, the distance is estimated by the number of steps the user moves through a certain algorithm (steps * stride), and there will be some errors in stride, height, weight, gender, etc