Autel Robotics EVO II Dual 640T Enterprise Bundle V3 Drone with Thermal Imaging - Manual (Page 45)

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Important
 Before the flight, check every propeller is firmly secured.
 Do not use a damaged propeller.
 Do not touch a rotating propeller or motor.
 Always remove the propeller before you test the motor.
3.3.3 Compass Calibration
Generally, you do not need to calibrate the compass as it has already been
calibrated before the delivery. Perform the following steps to calibrate your
compass if one of the following errors occurs: the compass shows incorrect
information, the aircraft is flying in a wrong direction that is not consistent with the
input, or the location where the aircraft is flying is far away from the calibration
location.
Warning
 The compass is very easy to be affected by electromagnetic interference.
Electromagnetic interference may lead to compass errors and degradation in
flight quality. If the compass still cannot work properly after the calibration, fly
the aircraft to other places and calibrate the compass again.
Pay attention to the following precautions when calibrating your compass:
 Select an open outside area.
 Keep it away from all sources of magnetic interference, such as magnets or
steel reinforcements. Proximity to large structures may also affect the
calibration results.
 Keep it away from underground and overhead power lines.
 Do not carry ferromagnetic materials during calibration (such as keys or
magnetic jewelry).
 Keep it away from all electronic devices such as mobile devices that may
interfere with calibration.