GPSTest, best open-source Android GNSS/GPS test program:

GPSTest, best open-source Android GNSS/GPS test program:
* https://github.com/barbeau/gpstest
* https://f-droid.org/packages/com.android.gpstest.osmdroid/
* https://play.google.com/store/apps/details?id=com.android.gpstest