The mobile phone has been positioning, as long as you turn on the positioning, because the screen is closed, and the positioning mobile phone data is not updated on the screen. But when you turn on your phone again, the tracks you have traveled before will be recorded one by one.
When our vehicles are driving or parking, we usually encounter tunnels, tall buildings or places with many trees. In this case, the GPS signal will be weak, even completely shielded, and the equipment will not receive the signal, resulting in inaccurate positioning.