Hi, Waiting for my Phantom. One of the initial procedures will be to align the compass before first flight. The question is quite simple. How far away is it safe to do this from a powerline or a stell house roof? I have about 100 feet in front of my house to the line. Is it safe to calibrate from that distance? Second question is while in flight how close can I safely fly near that line? It will during flight be between the bird and myself, any concerns? Last, I have a steel roof on the house. Any issues? As always, thanks for the great help!!