Miata Mailing List: February 1997, Message #13
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   From: (none)

Subject: Re: Inaccuracies of GPS - Re: Tach gauge and other gauges

   Date: (none)



On Sat, 1 Feb 1997, John Freas wrote:



> Previously on GPS, Dan Scolnick  said...

> 

> > 	I've been thinking about the GPS inaaccuracies.  While it is

> > rather unpredictable from time to time to take you back to the EXACT same

> > location (it will be off 100 meters over a number of tries) my speed

> > calculations on cars speedometers have been 100% reproducable.  Since

> > measuring speed doesn't really car about where you are but how you are

> > moving I think that the built in military inaccuracy for location may not

> > have the same inaccuracies regarding speed.

> 

> Possibly not, but my thinking is that since the speed is determined by

> calculating how long it took you to go from where you were to where you are,

> it would be affected each time a position was calculated.  It is possible that

> while using the same satellites, your error is exactly the same, in which case

> the speed calculation would not be affected.

> 

> 	-John

> 

> ------------------------------------------------

> John Freas (jfreas@gte.net)

> Red '90 Base

> Clearwater, Florida

> Team Roebuck

> Team Voodoo

> Team Redline MTL

> Team No hardtop posts

> Team "I have no idea what those dimple things on the windshield frame are

> for."

> ------------------------------------------------

> 

> 

	Yup, that would explain it, but somehow I think the government is

far more insideous than that.

/^\dans