I can't use GPS navigation on my Samsung Galaxy A12 Android 10.0
Cause 1 of 2: There's not adequate GPS signal
The first time the phone is to find a GPS signal on a new location, it may take several minutes. Urban agglomeration or forests may interfere with the GPS signal.
Solution: Go to a place with a clear view of the sky and wait a few minutes while the phone searches for a GPS signal.