So if your phone is in a cradle in your car and the back of the phone is facing north, it'll say your pointing north? Off the wall hypothetical here, but what if your not driving and facing the back of the vehicle moving north (like on a rear facing seat on a train or in the back of a limo) and looking at your phone, is it telling you you're facing south but moving north or will it compensate for the movement and tell you you're facing north? Does it have to be held up, or if it's lying flat, will it tell you the direction the top of the phone is? I just don't see it being accurate or extremely useful. I hope I'm wrong and say that it's a great feature when I see it, but I'm not building my hope up that it will work well or be of much use.
Oh, to clarksonknight:
I'm totally serious. Like I said, if someone has a use for it, I'd like to know.