the gps erroring behaviour is very weird, it works great when searching for gps lock (icon blinking), but with lock on tends to throw an error (especially when standing in the same place, while walking it seems to be gone, maybe AD is skipping sending same results from gps to the app to conserve battery? or maybe it's just pokemon go's pedometer misbehaving, the error tends to lock the game when in 'catching' mode so kind of annoying)