Wow! You just cleared that up in one message! That actually makes sense.

I hate to be so stupid about this but if I can ask one more follow-up question about the important "unlock codes"? Let's say I have a map that came with the unit - say CN North America 2011.10 with it's unlock code, can I use that same unlock code with a minor update, like 2011.20? Or do I need a new unlock code? It seems like the code is tied to the specific product and year rather than the version, right? So I'd need a different code for a different year but not a different version?

Garmin makes this all so difficult. I've got two units and one has been RMA'd so that's three. Here are the "descriptions" of the maps on my manage maps page:

City Navigator North America NT 2010.10, Deluxe All Regions, Apr 09
City Navigator North America NT 2011.10, US & Canada - Limited, April 10
City Navigator North America NT 2011.10, US & Canada, April 10

Each has an unlock code. I have no idea what's different, other than the year in the first case. Anyway, sorry for ranting... it's just confusing.