External Compass Calibration Fails - Unexpected Error

Latest Emlid Navio installed. Using Arducopter 3.6.5. Mission Planner 1.3.63. The I2C interface is activated in the Pi.

Have an external HMC5983 compass module installed on top of a mast to keep it away from other electronics on the quadcopter.

Selected Compass 3 (External) as the primary.

I cannot complete the compass calibration. Every time I try it begins normally but just stops updating midway through the process.


Is there any work-around for this?



Have you used this Ardupilot guides to calibrate (1, 2), @flyingw ?

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