Vector Compass on fixed wing

[Andy Sayle]

Tried enabling the compass.  It does sort the heading arrow on the little map thing out.  Which is nice.  Not sure I'm a fan of the calibration routine if that needs doing frequently. 

Not sure I'll end up using it all the time, so I guess this is the kick up the arse I need to get my Drak finished and flying, then I can put something in the air that covers the ground faster than the windspeed, eliminating the source of the issue!

Cheers
andy