Mercedes ml 2001 cd

Hi
I´m trying to find the maps for a Ml 2001. I just know that it uses cds but don´t know what to look for.
Anybody know what nav system it uses and where to find its maps ?
Thanks for your help

If the installed Nav is this one, you have to search for Blaupunkt DX CD's

You find the CD's here
http://www.navitotal.com/forums/showthread.php?7363-Blaupunkt-TravelPilot-DX-2011-2012

Thank you very much, sorry for the delay