i did a little bit of research and there is an update already for the dvd base navigation system. Well at least for me as my dvd says 2004-2 and they have 2005-2 available.

How to Get This Map

New updates are now available for your BMW DVD navigation system. Release 2005.2 is currently available, but can not be ordered from this site at this time. To order your new DVD update please call 1-888-NAV-MAPS (1-888-628-6277) or contact your local BMW dealer.

To find your closest dealer go to bmwusa.com