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    Re: GPS as a time authority
    From: Thomas Kleemann
    Date: 2009 Sep 16, 23:36 +0200

    I own among other an older Magellan GPS 300.
    Once I checked my radio clock against it and found a difference of
    several seconds (!). Even more disturbing was, that the difference was
    gaining visually observable.
    
    Finally I realized, that whenever the time display page of the unit was
    opened, the time was in accordance with the the radio clock.
    
    My conclusion is, there must be a very odd internal mechanism to display
    the time (software counter or similar), that is started with the
    original reading of the GPS signal every time one goes to this page.
    
    /Thomas
    
    douglas.denny{at}btopenworld.com schrieb:
    > Any differences found in the display of a GPS receiver must be, as Mr. 
    Parsons says, due to processing variations within the software to the 
    display.
    The GPS signal itself is the most accurate global time source easily
    available next to the helium maser or caesium fountain standard used for
    standardisation
    in the bureaux of standards such as Teddington in Britian and Boulder
    Colarado USA.
    
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