Naze32 - a warning about mag calibration and beepers (electromagnetic)

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I always buy the Naze32 full version in case I ever want to use the magnetometer. Up to yet, the only thing I've used the mag on, is the TBS. Anyway, I've never been able to calibrate one successfully and last night, the penny dropped..... it's because I always mount the beeper next to the Naze :)
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