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> 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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