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GPS use to have a dither added so that commercial users could not get the same accuracy as military users (who have access to a special password)
the dither was taken out a few years ago - so you can now get an inexpensive commercial GPS unit that is accurate to within a foot or two (postition).
They might have turned the dither back on temporarily, due to the war in Iraq - but if they did, it will be turned back off soon, certainly before next march.
due to the fact that they will be putting obsticals in the path, and there will be natural obsticals to avoid (and other vehicles on the course) you can not meet the requirements of this challenge with GPS alone anyway. your machine is going to be able to sense what is around it (somehow).
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