My IPhone experience is diff from yours & Brad’s.
I have my 2nd one now and have no intention of changing.
I’ve played with the compass that CAME in the phone and so far I’ve had
no problems. I also keep a liquid filled ‘manual’ compass in my back pack.
Sometimes batteries die in the phone (any brand).
I also use 1-3 GPS , map inc in the phone. So I’m not limited to just 1 compass.
Jerry
