It is called a Navigation Karte in the German game, so it is definitely for Navigation purposes, and I think the bank is for having a place where you can travel to to obtain money before travelling to another map.
Could still be based on points... and you have been right in the past, but I am of the persuation that it is mearly for travelling to and from maps. Points or no points.
im gonna agree with death on this one guys although it could have something to do with your points for example if you can travel to the other maps then you could somehow go back and forth to tranzit to get you money when needed but the card itself is for navigation at least thats my opinion and its not changing
I like that thought-
A bit tweeked you could surmise that after the rest of the DLC's drop, and form (what I'm hoping for anyway) a linkable teleportation device between all maps that allow all of them to be playable in one game, it may cost to teleport between them...