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    Re: GPS as a time authority
    From: Douglas Denny
    Date: 2009 Sep 17, 00:54 -0700

    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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