Agreed Marco , I should have made that clear.......I am refering to this particular object (USA 193 ) where accuracy to within a second or two will be better than nothing. John ----- Original Message ----- From: "Marco Langbroek" <marco.langbroek@wanadoo.nl> To: "John Locker" <john@satcom.freeserve.co.uk>; "satelliet lijst (SeeSat)" <SeeSat-L@satobs.org> Sent: Saturday, February 16, 2008 10:24 AM Subject: Re: Observing USA 193 - tips for beginners > > > John Locker schreef: > >> So I was scratching around to find a stopwatch , when I realised that my >> portable car GPS has an illuminated clock display , which should be about >> as accurate as I could expect... > > Hi John and others, > > In this case, where being even 1 or 2 seconds "off" still leads to > valuable data, it is good enough. But when you want times to an accuracy > better than a second, the displays of GPS receivers aren't good enough. > While the time the receiver gets from the satellite is very accurate, the > time they show in the display can be quite off with most consumer > receivers. I have frequently noted 1-2 seconds with mine. The priority of > the receiver software is on the position data, and it takes some time > before times received are output to the display. This depends on the exact > brand and type of receiver of course. > > - Marco > > > ----- > Dr Marco Langbroek - SatTrackCam Leiden, the Netherlands. > e-mail: sattrackcam@wanadoo.nl > > Cospar 4353 (Leiden): 52.15412 N, 4.49081 E (WGS84), +0 m ASL > Cospar 4354 (De Wilck): 52.11685 N, 4.56016 E (WGS84), -2 m ASL > SatTrackCam: http://home.wanadoo.nl/marco.langbroek/satcam.html > Station (b)log: http://sattrackcam.blogspot.com > ----- > > > > ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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