From owner-freebsd-hackers  Wed May  3 15:39: 2 2000
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To: Marc Nicholas <marc@netstor.com>
Subject: Re: GPS heads up 
Cc: "Brian O'Shea" <boshea@ricochet.net>, hackers@FreeBSD.ORG
In-reply-to: Your message of "Wed, 03 May 2000 18:10:28 EDT."
		<Pine.BSF.4.05.10005031809370.21765-100000@medulla.hippocampus.net> 
References: <Pine.BSF.4.05.10005031809370.21765-100000@medulla.hippocampus.net>  
Date: Wed, 03 May 2000 16:38:20 -0600
From: Warner Losh <imp@village.org>
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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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