> 1.  Have a central GPS reciever at a stable position, say on
> a pole or one
> the roof of a house.  Read it's location once.  Then forever
> after, read
> it's location again, and rebroadcast the *error* from the most recent
> reading versus the very first reading to your robot cotton picker on a
> different frequency.

In the Netherlands there are some radio stations that broadcast their
current GPS position.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products

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