Compass calibration completed when, Re-power on, Notes for use – XAIRCRAFT MINIX User Manual
Page 15: Rc neutral point calibration
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Copter stays horizontal
Revolving slowly until slow green LED flashing
Then vertically rotate until solid green, show as below:
Copter side up
Rotate slowly until LED solid on
Compass Calibration completed when re-power on.
Notes for Use
Do not use GPS ATT Mode and Return to Home function in the areas which suffer from
magnetic interference, for example, between buildings or indoor .
If calibration keeps failing check if there is strong magnetic source interfering GPS module
If you fly in a new place should re-calibrate the GPS Compass Module.