Compass calibration, toilet-bowl effect

LeesburgAirlines said:

Thanks to everyone for your great insights and information about this issue. It's been extremely helpful and ultimately a flight time saver.

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The Editor said:

Exactly my thoughts and a practice I have kept to for the last two years.
The only reason to do a compass calibration is to give the magnetometer a reference for the magnetic declination at your geographic location.
By doing repeated calibrations you run the risk of unknowingly introducing an error by calibrating near a hidden metallic object. The mod values will adjust for this object but once airborne you are then clear of this anomoly and only the magnetic flux for your declination is acting upon your compass. Unfortunately because a skewed calibration was done on the ground your mod values are now out of the optimum range and your AC flies like it's drunk or worse causes inexperienced pilots to crash.
I have only ever calibrated my compass in a known trusted location.
As far as IMU calibrations, I have done three, one after each FW update and that's it!

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The Editor said:

I should add, this is my own practice and people should make their own minds up whether they wish to do the same or follow DJI's recommendations. I cannot be held responsible if you decide to do what I do and your Inspire ends up a fireball in the sky and spirals into the depths of Hell whilst whistling like a banshee! (Thats the legal bit out of the way )
Just be mindful to ALWAYS check your mod values before EVERY flight, even between batteries. If any one of them is out of threshold......do NOT fly.
Remember, takeoffs are optional but landings are obligatory!

Finally, I would add, in hundreds of flights across multiple platforms I have NEVER had a compass issue/TBE scenario or any other problems following this method.

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