I have a 05 withOUT the nav. I checked the NAV out in another H2 and it sucked. You have to have the map CD in to operate or something. It's a single CD HU and the sales guy said to get a 6 disc CD changer installed where the Onstar is or something like that. I went with the regular deal.
I've seen them on EBAY yesterday..
Good Luck
-SssH2
