Ok I am still confused on what I am suppose to do.

I have a Nuvi 255W, how do I get the updated map? I just need Canada. What are the steps?

What are the files for each of these for:
US
Canada & Mexico
3D-gmap3d
North America_DEM
FourSquare
Parkopedia
ASR
JCV
SID
SQLite
National Parks

And what is the "For PC" files for?

A note: there is a difference between the updated map of today vs City Navigator North America NT 2011.1v20.11

City Navigator North America NT 2011.1v20.11 can show mountains, but today's doesn't, is there a reason why?

Sorry if my post is not good