1. I had this installed on another Phantom and it was fine. I had to switch out the Phantom2 with the newer version. 2. The newer Phantom 2 is the latest build, designed for the H3 3D. I put the GS setup on this. 3. Now the mystery. The altitude is off by 5 meters. Basically I have to add 5 meters to all my presets for the waypoints. 4. If I don't compensate it fly into the ground at 5m or less. 5. The really curious thing is that it auto-lands just fine. Any help will be appreciated. Thank you.