Country: Australia
My car: Toyota
Radio: JY-TM123N2
GPS is lost when the car is put on reverse or if any other application is run on the unit. I have already reset the unit and installed the application, but the problem persists.
The very first thing I did with my joying unit was to side-load gpsstat APK. There are many free ones to choose between on google play. First and foremost you want to insure you have strong gps signal and lock from satellites. I like the free gps status app from MobiWIA, and have used it for years on many android devices. Should you experience gps unlock the gpsstatus app can give you immediate feedback on what the signal quality looks like.