Since I can't fly due to snow and cold for the last 3 days, and my battery was full. I thought it a good idea to play around with the go app and learn what everything does when ever I have a moment. So I left the phantom on a table that is on 5-6ft away from some home theater speakers. Question 1 Could this harm the compass? Or is 5-6 ft safe? I know when I calibrated the compass the mod value was 1400. Last night it was 1700. But when I look on it's map view the airplane symbol points exactly in the direction the phantom is facing. If I move the phantom around the symbol points correctly. Question 2 Is the airplane symbol pointing in the right direction a good indication of proper compass calibration?