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    Re: GPS as a time authority
    From: C Sellars
    Date: 2009 Sep 15, 13:06 -0700

    Hi John,
    I wear a Casio model 3089 that recieves a time calibration signal from
    Fort Collins ( for the US )and updates its time setting accordingly. I
    have owned this watch for 6 months and am constantly checking it
    against my Garmin 12xl gps time. I have never seen even a second
    differance. I am assuming my GPS must be doing the calculations
    necessary to give me UTC. We also use the GPS time for racing
    sailboats. This watch is amasing, I have not had to manualy set it
    since it was purchased.
    Chris Sellars
    
    On Sep 14, 9:05�am,  wrote:
    > I think this has been dicussed before, but I'd like to be refreshed on the list's opinion:
    >
    > While assisting the Race Committee at a regatta this weekend, I heard the 
    timekeepers say that they were using "GPS time." �I noted that my $79 
    wristwatch, which I check monthly against the US Bureau of Standards atomic 
    clock (ph: 303-499-7111) and which doesn't lose a second per month, was 8 
    seconds ahead of the Committee's time.
    >
    > I later checked the time shown on my hand-held Gartmin GPS receiver, and it 
    agreed with my watch. �The watch was also still in sync with the Bureau's 
    atomic clock.
    >
    > Question: �Is the time displayed by GPS receivers considered a reliable and 
    spot-on source, up to the requirements of accurate celnav? �I would think 
    that it would be, since the GPS network depends on accurate tracking of the 
    satellites' position at a given time, yet there was that 8-second 
    discrepancy. �Perhaps the Race Committee were simply careless about setting 
    theior clockby GPS.
    >
    > Any thoughts, List Members?
    >
    > -John Parsons
    
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