Hi

Just bought my first Mercedes - I'm sure this is a good move.
Car comes with a navigation screen but no navigation system. Dealer told me a navigation system would cost $3000 .
I'm guessing there is some sort of after market option considering I have a screen and nav controls on the screen.

Also looking for the best value after market warranty for this car - any suggestions and how much will it cost??

Any help on these would be greatly appreciated