Date: Wed, 23 Apr 2003 15:52:41 -1000 From: "Arthur W. Neilson III" <art@pilikia.net> To: David Kelly <dkelly@HiWAAY.net> Cc: freebsd-questions@freebsd.org Subject: Re: Accurate time without a network connection? Message-ID: <582303098.1051113161@[10.12.1.96]> In-Reply-To: <200304231958.15174.dkelly@HiWAAY.net> References: <20030422184554.GA13432@grumpy.dyndns.org> <250593183.1051090233@[10.25.0.9]> <200304231958.15174.dkelly@HiWAAY.net>
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--On Wednesday, April 23, 2003 7:58 PM -0500 David Kelly said: | On Wednesday 23 April 2003 02:30 pm, Arthur W. Neilson III wrote: |> |> <http://www.wh7n.net/refclock/clock1.php>; | | That is really cool! Thanks! I had fun building it. The GPS card cost me $110 from synergy.com I got a discount cause I'm a ham and the TAPR board was $45 bucks. Pretty cheap for such an accurate clock. Be aware not all GPSes have the PPS output. If you really want super accurate clock you need the PPS output. The Motorola has it but the ordinary Garmin handheld does not. | As for other fun things I have my GPS sitting in a window trying to get | a lock. It actually holds a lock about half the time. So I'm starting | to play with the NMEA clock driver in ntpd. I bet your GPS is in 3D position mode. If you can command the GPS to run in 0 position mode you'll get that lock 24x7. The UT+ uses a proprietary binary (non-NMEA) protocol that most software supports. The Motorola's are used by the military embeded in all sorts of gear and is a high performance and sensitive piece of equipment. I do have a Garmin handheld which I use for hiking and such. I use a GPS mapping software from fugawi.com along with raster images of the USGS topo quads for Hawaii. Works real well for setting waypoins on a map and planning hiking trips etc.
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