If the car is equipped with COMAND, it has the NAVI system as well. There is a software upgrade available, but it won't add any features that the system doesn't already have. It will only fix a few glitches inherent to the COMAND 2.0 system. Also, if the car is a 2001 model, there's a good chance it already has the latest software. If you do take the plunge on this car, make sure it comes with the entire set of NAVI CD's.