I'm having a hard time getting my Phantom 1 into the compass calibration mode. Sometimes it takes me ten or fifteen times before I reach the mode. Very frustrating, because I'm wasting all that battery time. I've come across one other user on the DJI Owners Facebook page that as run into this problem and he doesn't know what the problem is either. The only mod I've made to the Phantom is to upgrade the PC board in preparation for the Zen Muse Gimbal installation. Has anyone else experienced this? Any ideas on what could be causing this? By the way, the search engine on this forum is really hard to use.