> Of course, a GPS built into a car is going to assume the car is on one
> of the roads on the map, which can also throw things off.

More precisely, it assumes that you're on the road it's telling you to 
drive down, until you get X number of yards away from that road, at 
which point the location indicator suddenly snaps to the road that 
you're *actually* on.

Some of this might be the inaccuracy of the road maps, but even at low 
speed it seems to take a very long time to figure out where you actually 
are, which leads me to think that most of the time it's guessing, 
because the GPS fix isn't very accurate.

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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