Dr D
Thanks for help with the PN's
One thing though is that the original poster has an ML55, which has the CDROM based nav unit from the factory.
Shouldn't the DVD based nav require only the new drop-in unit for the MCS? Everything else should already be there and be compatable with the DVD unit.

Gilly

PS And as Mr Kiser mentioned, don't forget the price of the DVD USA Map also, it's at least $200.