From owner-freebsd-hackers Thu May 4 20:21:28 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from dt051n0b.san.rr.com (dt051n0b.san.rr.com [204.210.32.11]) by hub.freebsd.org (Postfix) with ESMTP id A316E37B86F for ; Thu, 4 May 2000 20:21:24 -0700 (PDT) (envelope-from DougB@gorean.org) Received: from gorean.org (doug@master [10.0.0.2]) by dt051n0b.san.rr.com (8.9.3/8.9.3) with ESMTP id UAA34333; Thu, 4 May 2000 20:21:15 -0700 (PDT) (envelope-from DougB@gorean.org) Message-ID: <39123E2B.B85E03BC@gorean.org> Date: Thu, 04 May 2000 20:21:15 -0700 From: Doug Barton Organization: Triborough Bridge & Tunnel Authority X-Mailer: Mozilla 4.72 [en] (X11; U; FreeBSD 5.0-CURRENT-0422 i386) X-Accept-Language: en MIME-Version: 1.0 To: Warner Losh Cc: Nate Williams , hackers@FreeBSD.ORG Subject: Re: GPS heads up References: <200005041411.IAA17374@nomad.yogotech.com> <2288.957418565@critter.freebsd.dk> <200005040801.BAA67715@apollo.backplane.com> <200005042156.PAA43697@harmony.village.org> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Warner Losh wrote: > > In message <200005041411.IAA17374@nomad.yogotech.com> Nate Williams writes: > : 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. > > The experts here tell me that professional surveyers get sub meter > accuracy with in about an hour with commercially available hardware. > This was with SA. The difference is the "commercially available hardware." The more seperate signals you can discriminate with a given receiver, the faster you can zero in on accuracy. Doug -- Excess on occasion is exhilarating. It prevents moderation from acquiring the deadening effect of a habit. -- W. Somerset Maugham To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message