Hi, Everyone, This is Terry from DJI HQ. I've read our phantom users have compass issues like TBE, not flying in straight line in certain areas. This is very strange to us and engineers are very concerned about it. We believe it is related to magnetic interference locally. To find out the cause and solve the problem, I'd like to request for beta testers in this forum who: 1. own Phantom 2 or Phantom 2 Vision. 2. suffer compass issue and compass calibration does not help with latest 2.0 0 firmware. 3. have iOSD Mark II installed and provide flight data for analyse. 4. experienced in flying. We will try our best to fix this issue and very appreciate your help as testers. If you are interested, pls reply the thread and I will contact you shortly. Thanks.