Received my P4 today, after a couple of hours of clunky updates, most of which failed at least once, and holding my tongue the right way whilst restarting phone, controller and bird I finally had the thing up to date. The whole time I had a compass error, asking me not too calibrate but restart the thing. After some time I found the compass calibration in the sensor menu, under the advanced tab in the drone part of the (main) menu......... I'm a marine electronics tech so used to searching for important things three or four menu levels deep. Swung both compasses, another thing that is like riding a bike for a marine tech. Is annoying that there is no confirmation that calibration is successful, obviously was not successful for compass 2 as still get constant error asking to restart. Found a post on the DJI support forum with someone having same issue and the DJI tech suggested "tapping" the bird as maybe the compass was stuck.... Wtf. The thing is worth, well cost.. 2k AU. I'm not overly happy. Lemon