Well, I called Delphi and asked them about retrofitting their Integrated Navigation Radio (INR) to a 2003 H2. This is the unit:
http://www.delphi.com/pdf/d/int_nav_radio.pdf
Anyway... Bad news. I was told over the phone that this unit cannot be purchased separately, and that GM does not plan to retrofit this unit.
So unless the dealer is willing to try this on his own (GM won't help) I guess we are S.O.L.
Too bad - GM could sell a bunch of them...
Klaus
"God made some men big and some men small, but Sam Colt made them all equal."