derrickduff said:
It's a digital compass, the orientation should not be important. What is important is that it is secure when you calibrate the compass. Magnetic north can vary by a few degrees in neighboring cities, and can vary by 10s of degrees state to state, country to country. Furthermore Magnetic poles are opposite in the North and South Hemisphere. The compass doesn't know where it's at or what orientation it's in. It only knows that A certain direction is where magnetic north is pulling. The compass calibration is exactly for this reason. If there was no compass calibration we would have to physically adjust the compass every time we went to an area with a different magnetic north. Thankfully we don't have to do that.
Long story short, If you move the compass to another set of legs make sure it is secure and perform the compass calibration.
BE CAREFUL. The above is incorrect. The orientation is paramount for the Phantom compass. Forward MUST point forward. When looking at the front of the Phantom head-on, the compass is installed on the back-left leg. That orientation MUST be maintained if you move the compass to a different location. E.g., if you move the compass from the back-left leg to the back-right leg, the compass must be screwed onto the outside of the new leg, in order to maintain the orientation.
If you get this backwards, the Phantom will think that the nose is pointed in the opposite direction, and when it tries to adjust its attitude, it will drift even further off-course from where it was intending to turn, and you end up with an increasingly large and fast spiral called the "Toilet Bowl Effect" that soon becomes almost impossible to control.
So if you're playing around with the compass, it's a good idea to use a sharpie and place a black dot on the "forward" end of the compass, so no matter where you move it, you always have a visual indication for which side should be pointing forward.