DJI Naza-M Lite - Manual (Page 38)

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 After a successful test fly, the preparation before taking off can be simplified: Put your multi-rotor on the
level ground, turn on the transmitter first, then power on multi-rotor, then you can take off in Atti. Mode.
 If the aircraft drifts or spins in horizontal direction when hovering, please use IMU Calibration in TOOL
of assistant software to observe sensor output. If there is bigger gyroscope bias, do gyroscope calibration
according to the IMU Calibration in Appendix .