I can't use GPS navigation on my Apple iPad (8th Generation) iPadOS 15.2
Cause 1 of 2: There's not adequate GPS signal
The first time your tablet 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 your tablet searches for a GPS signal.
