Me too. But somehow I just cannot help but wishing that DJI had included some of these possible functions into the P4 instead of some of the more esoteric functions, like the "sport" mode. For most of us, a Phantom drone is quite a hefty investment, and any help that can save our precious toy from disappearing (not to mention all the possible collateral damage that can be the result of a malfunction or a pilot error) would be extremely welcome.
I would really suggest DJI that the calibration process (for both the IMU and the Compass) would be expained in much more detail in the manual, as it is definitely not just something that can (or should) be done on regular basis. You need to know WHEN, WHY and HOW to do it. It is not just a matter of doing the "DJI dance" every time you go out flying, "just to be safe". It is in fact a very delicate action that will affect the whole functionality of the drone.
My thanks to all of you who contributed to this thread!
//Tom