I have a new PH3 and want to fly it indoors around a warehouse full of metal machinery and overhead fluorescent lights. It's a packaging facility and I am asked to shoot some video of the operation in action. I did some test flights with my Phantom2+ today and with almost no wind indoors and certainly no GPS, I was having trouble holding the Phantom still and flying straight lines. I realize the GPS is not working and since I'm more than 9 feet off the ground, when I switch to my PH3, I suspect the vision positioning system will not do much. Is the compass being thrown off by all the metal indoors, or what can i do to ensure the most stable flight? the copter is acting just like a marble would on a glass table top. It wants to go somewhere, anywhere but holding still and the slightest movement in any direction is only exacerbated until it starts drifting quicker. Is there a way to disable the compass or is it not coming into play at all with either model Phantom? How should I set up the Ph 2 or 3 for getting the smoothest flight path indoors (ceilings 20 feet high or better) around machinery where the floor is not a good place to calibrate the VPS sonar system?