Fix Hawk 2.1 Gyro sensor Is it safe to tilt to a certain degree? - Flight Controllers - Discussion Forum, for PX4, Pixhawk, QGroundControl, MAVSDK, MAVLink
PREFLIGHT_CALIBRATION button to request gyro calibration for Copter · Issue #694 · ArduPilot/MissionPlanner · GitHub
ArduCopter 2.9: 'Level' accel calibration leaves attitude tilted · Issue #51 · ArduPilot/ardupilot · GitHub
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