I'm only a few days new to the Phantom (and flying anything remote control) and have only been able to fly mine in the evenings out of my backyard, so I have only basically gone back and forth a little, and straight up! ..which gets a little scary. (and that's at only perhaps 100 feet up!). But I definitely wonder: just how high people have taken theres? I'm guessing the limit is the 900ft range of the transmitter, but boy that seems insanely high up! and then it would drop down until it was in range again, or would it then fly home under GPS?