I've always been in NAZA-M mode and I've done it many times but never felt happy that it has completed successfully and stuck. The first rotation always ends with a satisfactory change from yellow to green but at the end of the second rotation it always seems to flash red just a few times and then return to normal NAZA-M flashing (Sat count and GPS/ATTI mode etc) I know in the DJI manual it says if it flashes red AND yellow at the end of the second rotation then it hasn't worked... but it is a strange feeling when you're not absolutely sure if what you've done is OK? Yesterday I calibrated it in the middle of a football pitch in a park which I thought would be an ideal place. I think it was OK but again I got the few red flashes at the end of the second rotation and then immediately it goes to normal flashing - so confusing! Does ANY red flashes after the second rotation (even if only a few before returning to a normal pattern) mean the compass hasn't calibrated?