Explanation:
A：The position of the motion record of the band depends on the positioning information of the mobile phone. The reason
for general motion track drift is that there is a gap between the actual position and the mobile phone's GPS positioning, and
there is a continuous track with a certain interval between the actual route and the movement.There are many factors that affect
GPS, such as tall buildings around, complex terrain, complex electrical signal environment, harsh climate conditions such as sandstorm,
rainstorm, and other harsh natural weather.