The WIKI reads: Next connect with the Mission Planner and go to INITIAL SETUP > Mandatory Hardware > Compass and set the Orientation to ROTATION_ROLL_180.
When I do this the copter flies away in stabilise. Also taking a look at the compass readings in the LOG I noticed that the magY and mag2Y changes are opposite. When turning my copter by hand I see the heading on the map moving corretly for a brief moment (gyros), but then it corrects to the opposite direction and stays there.
TMHO it should read: ROTATION_NONE. If I change the setting like this the reaction on the map is normal.
Setup: PixHawk and GPS/Compass module both mounted with arrow pointing to the front.
However when you select PixHawk/Px4 in the settings of the compass in MP it defaults to NONE.
I find it also very confusing, is a PixHawk an APM or not? I would believe so as this website is the APM website, so do I have to select Pixhawk/Px4 or APM with external Compass in the settings? I would think that the first is the internal compass of the PixHawk without external compass and the latter the setting for the external GPS/Compass module. But if you select the option with external compass the Roll_180 value is chosen.