Definition: The riding track is marked by the circle counting method. Mark the track point, and the difference between the current marked track point and the previous track point is counted as one lap;

Function: Various data of the two trajectories marked by the circle can be compared and analyzed on the website;
For example, the user rides around the playground, a circle of riding presents one lap, and then uploads the fit file to the website, then the user can compare the data of each circle ( speed, mileage, etc.)