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Date:      Thu, 4 May 2000 08:11:06 -0600 (MDT)
From:      Nate Williams <nate@yogotech.com>
To:        Matthew Dillon <dillon@apollo.backplane.com>
Cc:        Poul-Henning Kamp <phk@critter.freebsd.dk>, Warner Losh <imp@village.org>, hackers@FreeBSD.ORG
Subject:   Re: GPS heads up 
Message-ID:  <200005041411.IAA17374@nomad.yogotech.com>
In-Reply-To: <200005040801.BAA67715@apollo.backplane.com>
References:  <2288.957418565@critter.freebsd.dk> <200005040801.BAA67715@apollo.backplane.com>

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> :SA *can* be averaged out, it has an average value of zero.  But it
> :takes several days or even weeks to get into the centimeter range,
> :depending on the satelite coverage where you are.
> :
> :--
> :Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> :phk@FreeBSD.ORG         | TCP/IP since RFC 956
> 
>     Months or years to get into the centimeter range.

That's very different from what the GPS experts at SRI tell me.  They
start to average things out in a matter of hours, and within a week can
have it almost gone.  However, they're also using multiple satellites,
which allows them to more quickly find the center.


Nate


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