Hm… GPS has been quite a pain so far, for both Android and iOS :)

The best hint: If footsteps appear your distance was tracked. So if you lock the phone, walk somewhere, unlock and there’s footsteps from your old to your new position the distance was 100% counted.

With the Godot settings in place the game should prevent your screen from switching off (I usually just lock my phone or use pocket mode if I want to keep it on).