A: The problem is that GPS must receive three more effective satellite signals at the same time to position, the following reasons may cause bad signal reception:

1. In the urban areas, there are too many buildings or shields impact on the quality of signal reception.
2. In the tunnel, viaduct, the buildings will affect the quality of signal reception.
3. If you place the GPS Receiver in the vehicle, some sheathing paper will obstruct the GPS signals, and affect the quality of signal reception. The approach is waiting for the normal reception of satellite signals, and satellite receivers to be placed out the vehicle with strong signal source.