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RE: [ST] GPS error question (accuracy circle)



It had been my understanding that civilian GPS was, until recently, held to 
much looser error rates than military spec. So your 500Ft error ring could 
be correct. Very recently the Goobermint decided to allow military spec to 
be available to all GPS system in the US.

So the civilian error rate went from something like -/+200 yards error 
to      -/+2 yards of error.

Pretty darn good, eh?

peace,




At 07:27 AM 8/17/01 -0700, you wrote:
>OK, its mentioned on page 40, but look at the pictures. Scale on the map
>indicates |____| = 500 ft. The accuracy circle's diameter is about 500 ft! I
>know theses things are much more accurate than that. Plus, the satellite
>page usually indicates an accuracy of 15-20 ft. What gives?
>
>-Chris
>
> >CS-  The displayed EPE is usually around 15-20 ft., but goes as high as 50
>or
> >CS-  more. The circle on the map page, however, is usually several hundred
>feet
> >CS-  in diameter. Unfortunately, the manual does not even mention the
>circle.
> >CS-  Does anyone know how to read it?
>
>It is called the 'accuracy circle' page 39-40
>
>--
>Mike Bostock
>mike@xxxxxxxxxxxxxx
>http://www.toothfairy.co.uk/
>Wales and SW ST Riders
>http://www.sprint-st.org/
>
>'99 Red ST
>
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Andrew Bell, Test Technician
Mixed Signals/ULTECH

e-mail: abell@xxxxxxxxxxxxxxxx
Tel: (203) 758-8667
Fax: (203) 758-8693
Web: www.ultechvideo.com, www.mixedsignals.com


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