I don't know what it takes to swap over a nav unit from a non nav unit, but it's a little more involved than just plugging in the SD card and swapping out the sync unit. Some of the Ford people around here have said it's not possible to swap to a nav unit when yours comes from the factory without it. That being said, nothing is impossible especially since the parts are made for the car, but it's a matter of how much stuff really needs to be swapped. Might be likely the wiring harnesses are completely different.
I suppose someone could be the guinea pig to find out what it does take to swap the nav unit in.
I suppose someone could be the guinea pig to find out what it does take to swap the nav unit in.