OK, based on subsequent posts, Truegreen may have blended two statements that was displayed into a single misleading one.
"check GPS settings" - having it off or not having permission to it can deny access to the compass, which may be all it really wants
"Calibrate device compass" - if it is inaccurate, it can't know which way you are facing, and so it can't know where the AC is around you. If the AC is North of you, and you are facing west, then the AC is to your right. But if the app thinks you're facing east, it will show the AC to your left.
"check GPS settings" - having it off or not having permission to it can deny access to the compass, which may be all it really wants
"Calibrate device compass" - if it is inaccurate, it can't know which way you are facing, and so it can't know where the AC is around you. If the AC is North of you, and you are facing west, then the AC is to your right. But if the app thinks you're facing east, it will show the AC to your left.