I have a 2000 ML 320. The wish to use the navigation system and am told i need CD. unit in my car has CD player back. Is it still possible this nav system?

Yes, it is still possible to use the navigation system in your 2000 ML 320, even though the CD player is in the back. Here's what you need to do:

1. Check if the navigation system is installed: Press the "NAV" button on the head unit to check if the navigation system is installed. If the navigation screen appears, then the system is installed.

2. Insert the navigation CD: Insert the navigation CD into the CD player located in the back of your ML 320.

3. Switch to CD mode: Press the "CD" button on the head unit to switch to CD mode.

4. Select the navigation CD: Use the seek buttons or the touch screen (if available) to select the navigation CD.

5. Follow the on-screen instructions: Once the navigation CD is selected, follow the on-screen instructions to enter your destination and start navigation.

Please note that the navigation system in your ML 320 may be outdated, and the maps and points of interest (POIs) may not be up to date. For the most accurate and up-to-date navigation experience, it is recommended to use a portable GPS device or a smartphone with a navigation app.