Originally Posted by Stinsonddog
Yes you need the cell to work, to load the maps as you go. Problem is that there is no good program to do what you want on the BB yet. Spot comes closest, but you will need cell to pull the maps. That is the only one that I have seen that has geo maps. See my tips site for a full review.
Stinsonddog, if you have a Pearl, you might be able to get maps without cell coverage
Take a look to the thread I have just created: GPS Tool supporting the Map Image and Waypoint files