I bought my Phantom 2 V2 about a week ago. All flights are fine and I switched to NAZA-M ( one minor problem, but I will figure it out later). So here is my question about power lines. I know the power lines have a magnetic field and that the magnetic field is perpendicular to the wire. This is why we don't do a compass calibration near power lines, or it give a false North. If I do a compass calibration away from a power line, then fly under it, what happens? Will it scramble (or reset) the circuit or will it just confuse the Phantom into thinking North may be somewhere else (temporarily)? The reason I need to know is I am on one side of the canyon and need to fly the Phantom in the canyon upstream. There is a powerline going across the top of the canyon. When I fly upstream I will need to go under the power line maybe 20 feet under. Will it really mess the Phantom up, or will it just get a false reading of "North" but I should be OK as along as I am in Normal mode (S1 & S2 switches up). I can understand it might get confused if the Phantom is in Course Lock or Home Lock, since the forward is based on original setting ( which ever way it was facing when it was set up). But what about Normal mode? Will it still do something bad? What if I walk close to the power line pole and test the compass on my Iphone. If it does not change, then I might be OK ?