Aloha, Been reading everyone's posts and its been very helpful. Thank you all for your input. I was wondering if one of you gurus could help me out. My phantom vision had a couple of hard landings and have developed a problem. When descending from about 25', the quad would start to loosing altitude and power down. Increasing the throttle would not help. Its like it in a vortex ring state, but its not. On the next test flight, the quad would not park itself in the air (hover). Replaced the compass and tried to re-calibrate. It fixed the loosing altitude, but would not go into GPS mode and got different sequence of lights. Could anyone tell me what the lights mean? Here is the link: The quad is in Naza mode and the test flight location is approximately 4 miles from a major airport. Mahalo in advance!