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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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