On the Hero 3 White it is. If I'm not mistaken, the GoPro app is transmitting on a 2.4ghz freq for all Hero's using it. However, sometime back, there was an issue of interference with the Phantom 2 because of them both using the same freq. of 2.4ghz. Why DJI would allow such a flaw for wifi in the system is beyond me. Using the Hero cams without wifi and the Phantom 2 would work just fine. But you'd have to be in close eye sight of the bird to get what you'd like on the video.
I have a gopro 3 white. I have heard that some claim as in the above video that the wifi range is about 150 meters. I tested mine and only get about 80 feet. So, what's the deal. I never have the camera wifi on anyway on my 2.4 Phantoms but was curious.