Best to call Garmin on this one. I have City Navigator V8 and it came with two Unlock Codes for two different GPS units. However, the automotive units and the software that came with them might be different. With any luck, they will tell you that software did come with two Unlock Codes.
That's what I was thinking also. I played around a bit more, went to "MyGarmin" and made sure both units were registered.
Then I went in and asked for an additional unlock code for my new Vista HCX off the the original DVD software that came with the Street Pilot 2720. They sent me a code, so I uploaded everything onto a micro SD card via a card reader. The entire process took about 45 minutes to load onto the card. Popped the card into the Vista and everything was there.
Works great now.
Everyone thanks for the help.
BTW, I emailed Garmin just after I made my original post on this subject.
STILL WAITING FOR A REPLY FROM THEM.