I calibrate the compass on my iPhone 6+ and my P3P before every flight with no metal anywhere near me, and my red pointer is never pointed in the same direction as my camera. The P3P flys perfect, so I don't worry about it. I normally just move the sticks a little to figure out which way the P3P moves to figure out which way it's pointing. The few times that the red pointer was pointing the same way the camera points at take off, it changed during flight, so that little red pointer is just about useless to me. The bird flys perfect, and hovers perfect, so it's not that big a deal. I don't know why these compasses are so dam delicate. The compass on my Garmin GPS, that sits in my truck, (which is 99% metal) works perfect, and never needs calibration.