Ok, I've spent hours trying to work out what i need, and what i can do etc, but cannot seem to find any definitive answers. I have discovered that the Ford Navigation System has an input for the rear camera, but i am still unsure if i can just purchase one of these from ebay http://www.ebay.co.uk/itm/FORD-MONDEO-S-MAX-GALAXY-TOUCH-SCREEN-NAVIGATION-SAT-NAV-7S7T-18K-931-NEW-/300904042822?pt=UK_In_Car_Technology&hash=item460f475146 then get the maps on DVD, a gps antenna, fit and connect the rear camera and away i go? replacing the sony sound system in the car.... is it as simple as that? I've read about some SD card for the navigation system too, is it DVD, or SD? or both? Anyone know? Thanks Jay