radioguy said:1. In the general opinion of the group, is it mandatory to do the compass calibration every time you fly?
Personally I choose to calibrate every time. For the sake of a 30 seconds and a quick foxtrot, it's a habit I've gotten into. I don't think it's necessary to do so unless you shift your flying site significantly.
radioguy said:2. Do the Phantom 1 prop guards fit the Phantom 2?
I think they fit however they are not much use as the blades on a P2 are longer than the original Phantom (p1=8" : P2=9"), therefore I think the blade tips would stick out past the end of the guards if fitted on a P2.