Re: GPS heads up

[Warner Losh]

In message <[EMAIL PROTECTED]> Marc 
Nicholas writes:
: Isn't that the idea behind Differential-GPS?

Not quite.  The Differential GPS has GPS receievers at locations that
have been surveyed down to the millimeter.  The DGPS software then
calculates the offset from the current GPS signal and sends that
information to the DGPS clients.

Warner


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