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

The CD player in the back is for audio cds. The navigation CD is located behind the faceplate for the MCS (modular control system). Press the open button on your MCS faceplate and insert the navi CD in the slot close the faceplate by pressing the open button or lift up slightly, then press Navi on the faceplate.