Re: Observing USA 193 - tips for beginners

From: Marco Langbroek (
Date: Sat Feb 16 2008 - 10:24:21 UTC

  • Next message: John Locker: "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.
    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
    Station (b)log:
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