Sure about this? I was in a restricted zone in Naza mode on my Phantom and it would not launch on any mode, GPS or ATTI. The restriction is still in place.
As Noel mentions the Phantom is quite capable of flying without GPS input, but I'm curious what about your planned shoot would have any bearing on that?
The shoot is a rugby game over a sports field, drone would never be more than 70m from me and not more than 50m high. i have a few windows between flights, the airport is not particularly busy.