This weekend I took delivery of a genuine Xenun TK102-2 GPS tracker which I'm delighted with. I've tested it twice and it's stated position was accurate to 1.5 metres both times. The problem is I don't know where to put it on my Phantom 2. The logical place would be to fix it to the top of the Phantom using heavy-duty Velcro or similar but, as I believe the Phantom's own GPS unit is right up in the crown of the body there, that wouldn't seem like a good idea. It seems that placing it in a vertical position, with the antenna facing the sky is the only option, and it certainly works in this position. When I tested it like that just now, it was accurate to within one metre. So I'm inclined to think that the best spot is to tape it to the outside of the left rear leg, opposite the compass?