I haven't even taken delivery of mine yet but from my reading of the manual and on this forum if you are talking horizontal distance away then because atti mode ignores GPS the Phantom has no indication of its position and so would not be affected by any limits set in DJI GO. If you really mean vertical height then the limit of 500 metres is set by the barometer which is active in all modes and in theory can't be exceeded in any mode. If you are in the USA then they have a vertical limit of 400 feet above ground level I think is also set by the barometer so works in all modes.