Hey Guys, So I've been trying to get used to my new Phantom (new to me) and I've been having a serious issue with the GPS Attitude Mode and HomeLock IOC not working. I've posted a video of what occurs below. The Phantom flies correctly when in Attitidue Mode and CL but when I switch it from CL to GPS mode it takes off like a bat out of hell and the only way to get it out of heading that direction is to switch it back to CL. I can fight it while its still in GPS mode but as soon as I let go of the sticks it goes back onto its original path. Also, HL does not work and I have tested that at about 100ft out so that shouldn't be an issue with the 10m boundary. I have done the compass calibration, the software is all up to date, have done the advance calibration numerous times and all the numbers look good, turned on IOC, and have checked out the GPS antenna to see if there is any visible damage (which there is not) and all of the wires are connected since I get a full GPS signal from the LED in addition to the LED indicating that it has recorded a home position (series of green lights). I can't seem to make heads or tails of what is going on and what is causing the problem. Any help would be appreciated!! [youtube]http://youtu.be/XPu9so3fbD4[/youtube] http://youtu.be/XPu9so3fbD4 I started out the flight in Attitude mode (orange single blinking light with full GPS) and then switched to GPS mode at the 0:03 mark at which point it took off the left until I switched it back to CL and was able to regain control. I redid the experiment at the 0:36 mark and it took off the in the forward/right direction. As you can see, once in CL it hovers and holds location fine as long as there is no wind.