Originally Posted by clubagreenie

For this to affect the ecu it would have to be tied to the sat nav. I can't imagine any reason to so this unless the car was driving itself and controling the accelerator etc. Sat only needs power and reception. Ecu is standalone system. It will unplug from the rest of the car not particularly affecting anything else. Hence the ability to perform engine swaps with reasonable ease when you have some simple elec skills and a complete harness to work from