I just purchased a 2004 e320. The command center is ready for navigation but the option was not installed. Appearantly I have to purchase a drive unit, harness and Nav DVD's. Where can I purchase these items? Where can I get them installed? I live in Northern California.

Thanks in advance...:)

You can purchase a plug-in navigation system from any MB dealer. It will cost you about $1800 installed.

Any after market GPS's that are the built-in types?