Why not simulate the existence of magnetic fields, by simulating the compass? Give everyone a small display device that shows where 'north' is. That device will have GPS and an internal map of the obstacle course, and will calculate what it should be claiming is north at any given place (time! One region might have its local north rotating at 1 revolution per hour), and display that.
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branchandroot
(no subject)
Date: 2007-03-13 07:03 am (UTC)