I've heard that the biggest cause of loss of control of a drone (apart from high winds) is compass error. I've also seen a number of videos where the drone does not report a compass error at takeoff, but obviously not all compass errors can be detected, and a subsequent problem happens during flight. Would taking off from a cardboard box or other non-metallic surface about 0.5-1m above the ground help prevent some fairly common compass errors? Are there other good practices beyond following a pre-flight checklist and staying away from obvious metal objects that can prevent hidden compass errors causing problems while in the air? Keen to hear everyone's thoughts!