Darren New wrote:

> I wasn't talking about the size. I was talking about the format.  As in, 
> how do you represent the paths of the road, the locations of services, 
> etc etc, in such a way that the machine can tell you "make the second 
> left in X miles".  My machine even tells me if I'm on a 5-lane road and 
> two lanes are exit-only, drawing the picture and telling me to keep to 
> one side or the other.

I would imagine it's some kind of space partitioning method, similar to 
how a game engine figures out with world polygons are "near to" where 
you're currently standing. ;-)

Actually the video data for displaying the map and the topological data 
for route planning are probably seperate. I would guess.

-- 
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