SL/R230: Navigation Activation??

Anyways, I can't get Nav to work. The MAP functionality works fine. This tells me: A) GPS works B) DVD is being read fine. But, when I hit settings on home, the voice says "Navigation not active". And when I hit destination entry, the screen with the alphabet comes on for a split second and then the screen goes back.
I asked tele-aid (since I have to call them once anyway) and he told me to eject the DVD and take it to a dealer if that didn't work. It didn't. Any ideas?
-jeremy
This may be off topic but I just purchased a 2006 sl 500 and looked at the nav disk and it has 2005 date on it. I was wondering if this is the correct one or should I have a 2006 disk. A little help would be appreciated.
Thanks



