The signal is weak during navigation. What version of your phone is it?
If the system is 9.X, drop down the notification bar, confirm whether to enable the location information of the phone, long press the location icon, open the Access My location information, and click the Improve accuracy button to enable the WLAN scan, which can improve the network location accuracy.
Secondly, in the process of driving navigation, if there is a metal window protective film and the car console will interfere with the GPS signal of the mobile phone, it is recommended that you place the mobile phone on the left side of the steering wheel, the signal will be better.