This is a question for the dealership, unfortunately.
If you are asking about GPS, you will be far better off buying a handheld recommended by Consumer Reports Magazine. The built-in becomes outmoded within a year or two and you have to buy a disc for 2 to 300 $.
Search Mercedes-Benz CLK-Class Questions
Mercedes-Benz CLK-Class Experts
Related Models For Sale
Used Cars For Sale