I had a fairly lengthy discussion with my WKM dealer back when I was going to calibrate the first time as each video & manufacturer seems to show something different.
Here is the way I do it and it was explained to me.
1. Enter Compass calibration mode by rapidly switching fight control mode switch several times. Wait a few seconds, the LED will turn blue constant.
2. Rotate the aircraft horizonally (flat to ground). Slowly to make a complete 360 degree circle, Center of the circle is a straight line through the center of the compass.
3. When the circle reaches 360 degrees, the LED will turn green constant.
4. Position aircraft so nose (front) is pointing down to the ground. Slowly rotate aircraft in a 360 degree circle along it's front to back centerline.
5. When the circle reaches 360 degrees, the LED will turn white.
6. Place aircraft on ground. Wait a few seconds. Power off aircraft.
As mentioned in several locations, I do this in the middle of a large field where I fly, away from buildings, metal etc., I even place my TX radio about 20' away while I do this.
It is very similar to what BorisS shows, but I do not dance, I just lean over the aircraft and do it in front of me.
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after all we are taking a risk on "evaluation" firmware.
