>Heck, I even use my GPS to go home, not for the directions,
>but just for the time of arrival, it's very accurate.

A friend of mine was going to drop his son off ay boarding school. He had 
recently got a new car with GPS installed (this was a good few years ago 
now), and decided for the fun of it, to use the GPS to find his way there. 
He was quite surprised to find the GPS found a route that was 15 minutes 
shorter than his 'normal' one. 

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