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    Re: GPS as a time authority
    From: Werner Luehmann
    Date: 2009 Sep 17, 19:42 +0200

    I wonder about the problems with "old" GPS sets some of you guys have. My
    venerable  Garmin GPS12 was purchased in 1998 and it always (at least when I
    check it) is in exact time compliance with the "radio time" (in my case
    DCF77 - Mainflingen/Germany) . Maybe the reason is that I always updated the
    firmware. The last update was provideed by Garmin as latet as in in 2003 (I
    think this model was already discontinued at that point of time).
    Could it be that Garmin is better than others in post sale customer support?
    Before we had started our summer holidays this year to the US I bought a car
    GPS - a Garmin (I admit, one additional point of consideration was the
    availability of US maps).
    Any thoughts or comparable/contrary experience?
    
    Werner
    
    
    
    . Am Donnerstag, 17. September 2009 09:54:49 schrieb
    douglas.denny{at}btopenworld.com:
    > I think we are in agreement actually.
    > My very point is that the accuracy available with GPS is fantastic - the
    > implementation of how it is displayed apparently though is very poor. Which
    > is very surprising. I was considerably annoyed when I found my Trimble
    > Transpak II had the time display 'out' by one second (knowing the signal is
    > so accurate) but put that down to lag in the display update of the one
    > second intervals. Still, very poor for such a sophisticated bit of kit.
    >
    > You say: "Apparently the  early developers of GPS receivers didn't take
    > into account that people would want time to split-second accuracy".  All
    > one can say is that as electronics designers, normally dealing with pulse
    > signals to fractions of microseconds - that is very remiss of them if they
    > couldn't be bothered to get the display of time accurate too.
    >
    > Douglas Denny.
    > Chichester. England.
    >
    >
    >
    >
    >
    >
    >
    > Whoa!!
    >
    > The problem is with the amount of time it takes an OLD GPS receiver to
    > display the time, not their internal knowledge of time.   Apparently the
    > early developers of GPS receivers didn't take into account that people
    > would want time to split-second accuracy -- it's certainly possible for
    > receivers to display the time correctly.   For older receivers that
    > might have meant anticipating the time it would take for the time to be
    > displayed.
    >
    > Respectfully suggest that we learn the model numbers and age of these
    > "slow" GPS receivers before we condemn all GPS receivers.
    >
    >
    >
    >
    
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