Can someone post a simple how-to on the process for calibrating the IMU on the Phantom 4? I can't seem to find this process? Maybe I am missing it!

It should be the same as the P3 IMU calibration.  You do it through the DJI Go app.

Enter DJI GO app, MC settings-> advanced setting-> sensor setting->IMU calibration.

Here's DJI's tutorial:

http://forum.dji.com/forum.php?mod=viewthread&tid=29724

And here's the link to their page on helpful tutorials:

http://forum.dji.com/forum.php?m ... mp;page=1#pid251592

DJI-Amy Posted at 2016-3-17 14:46
Enter DJI GO app, MC settings-> advanced setting-> sensor setting->IMU calibration.

Amy - Does the P4 need to be chilled, like the P3Pro did, before performing an IMU calibration in order to avoid "IMU warming up" delays on subsequent power-ups of the aircraft?  Or did DJI eliminate this IMU calibration issue on the P4?

Actually no need to chill the Phantom 4. We suggest you to calibrate the IMU at about 10 to 20 degree centigrade.

Thanks! All good info...

DJI-Wild Posted at 2016-3-21 05:44
Actually no need to chill the Phantom 4. We suggest you to calibrate the IMU at about 10 to 20 degre ...

Actually, I found I had to chill the P4 in the fridge (just like I need to do with my P3Pro) before performing an IMU calibration in order to minimize the time the "IMU is warming up" message is displayed during subsequent power-ups of the P4 aircraft.