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    Re: Time and cel nav, a stupid question
    From: Richard B. Langley
    Date: 2008 May 14, 13:13 -0300

    GPS Time minus UTC = +14 seconds currently
    .
    
    -- Richard Langley
    
    On Wed, 14 May 2008, Lu Abel wrote:
    
    >
    >Anabasis wrote:
    >> This is really quite simple.  Use the GPS.  GPS birds have atomic
    >> clocks on them and the only error in the time signal is from the
    >> transmission delay between the sat and your receiver.
    >The only necessary word of caution here is that you must make sure that
    >your GPS receiver is set to display UTC and not GPS time (which is 1980
    >UT without subsequent leap-seconds and hence is now off by about seven
    >seconds).   The default, out-of-the-box setting for most GPS receivers
    >is to show UTC, but it can be changed.
    >> A website has
    >> all sorts of network delays as packets get sent to and fro.
    >These delays can be accounted for by simply measuring the round-trip
    >delay from the time source to the web browser and back.   www.time.gov
    >does exactly this, and will even display any remaining uncertainty in
    >the time display.   For my broadband connection, this number is
    >typically 0.2 or 0.3 seconds.   I doubt one can set a hack watch this
    >accurately regardless of the time source.
    >
    >Lu Abel
    >
    >
    >
    >>
    >
    
    
    ===============================================================================
     Richard B. Langley                            E-mail: lang@unb.ca
     Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/
     Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142
     University of New Brunswick                   Fax:      +1 506 453-4943
     Fredericton, N.B., Canada  E3B 5A3
         Fredericton?  Where's that?  See: http://www.city.fredericton.nb.ca/
    ===============================================================================
    
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