Hello, I'm new of this place.

About Garmin map pilot, my thought is:
NTG5 audio20 : this is the head unit of mercedes car, the SD card have to insert this head unit to run the navigation, when the SD card inserted to the new car, the CID of this SD-card will be write in to head unit.

Maybe we can use Vediamo(the mercedes engineering tool) to modify the CID value that stored in head unit and the head unit is locked to read only that original card.
I have Vediamo, but I don't own the car....so I can't try.

How about that ?