From owner-freebsd-hackers  Wed May  3 15:50:15 2000
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Date: Wed, 3 May 2000 18:49:33 -0400 (EDT)
From: Marc Nicholas <marc@netstor.com>
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To: Warner Losh <imp@village.org>
Cc: "Brian O'Shea" <boshea@ricochet.net>, hackers@FreeBSD.ORG
Subject: Re: GPS heads up 
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Ahhhh....cool :-)

On Wed, 3 May 2000, Warner Losh wrote:

> In message <Pine.BSF.4.05.10005031809370.21765-100000@medulla.hippocampus.net> 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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