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    Re: Da Lurk
    From: Jared Sherman
    Date: 2003 Feb 10, 13:55 -0500

    Fred-
     
     I suspect that "point" will really be a zone, determined by the EPE accuracy 
    that your GPS is seeing at any time. For instance, when the civilian signal 
    was/is being degraded, you could see your speed and course whipping around 
    all over while you were bolted to concrete. There will always be some "noise" 
    like that behind any GPS operation. If you are moving at 1fps and the system 
    noise is 10fps, your GPS won't be worth reading. But if the reading you get 
    is CONSISTANT then you probably are not looking at noise, you are looking at 
    something real.
     How real, how valid? That's the naviguesser's job to say "The circle of 
    uncertainty is t h i s  b i g today." Since the operation of any computer, 
    including a GPS, is also dependent on how the manufacturer has programmed it, 
    you can't even begin to speculate on this until you refine it to one model of 
    GPS with one set of firmware and find out from the manufacturer what that set 
    will do in those conditions.
    
    
    

       
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