Jacob said:
I was not referring to the tower causing GPS issues. When you switch to atti. mode, it lessens the reliance on the compass which can be easily interfered with.
No. You simply don't know what you are trying to post about.
In both GPS and ATTI mode the Phantom uses the compass to determine the direction that the craft is facing. The compass is used equally in both modes and switching to ATTI mode does not "lessen the reliance on the compass." Not at all.
Furthermore, while the compass can be easily interfered with during start up due to ferromagnetic interference at the takeoff point, the compass cannot be easily interfered with while in the air. Especially not while flying near a radio station.