When the nose of my quad points south, the Planner (or copertGCS) say North. - all directions are good, but wrong.
The APM2 is mounted so that the SD card is in front left corner. - and GPS up, of course, do please don't ask that :)
it flies well, - but needless to say is useless to position hold, RTH.
how is this even possible ? - I recalibrated Compass, and also flew with learning on - does not help - the directions are good, but rotated 180degrees.