Why
Stable hover blends GPS, inertial sensors, compass data and downward vision. If one input becomes unreliable, the aircraft may drift or switch modes. Repeated compass calibration is not a universal fix and can make diagnosis worse.
What to do next
- 01Land in a clear area and inspect all propellers and motors.
- 02Review app warnings and satellite/vision status.
- 03Move away from steel, reinforced concrete, vehicles and power infrastructure.
- 04Calibrate only when the manual or app directs it, on the correct surface.
Important exceptions
- Small movement in wind can be normal.
- Indoor hover depends heavily on texture and lighting.
- Sudden uncontrolled movement after a crash requires professional inspection.
Safety note: Aircraft behaviour varies by model, firmware and configuration. For legal or safety-critical decisions, use the current manual and official aviation authority guidance.