Drone exam · Aviation regulations Regulation Why can app height alone be misleading near sloping terrain? Select one answer A It may be referenced to takeoff point rather than the ground under the drone. B Legal limits never apply on hills. C Camera view is always a legal height reference. D Drones cannot measure height at all. Check answer Correct answer: A. It may be referenced to takeoff point rather than the ground under the drone. The displayed value may not match the reference used by the relevant rule or authorization.