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

[Andrew Bell <abell@xxxxxxxxxxxxxxxx>]

Maybe you got a old stock GPS. A call to the manufacturer should clear that 
all up.



At 10:19 AM 8/17/01 -0700, you wrote:
>Yeah, sometime in 2000 our nice government decided that the civilians aren't
>really all that dangerous and we don't all have medium to long range
>missiles in our back yards. As such, all false errors were eliminated last
>year. This is why I'm confused as to why the error circle is so large.
>
>-C
>
>  -----Original Message-----
>From:   owner-st@xxxxxxxxxx [mailto:owner-st@xxxxxxxxxx]  On Behalf Of Andrew
>Bell
>Sent:   Friday, August 17, 2001 7:48 AM
>To:     ST@xxxxxxxxxxxxxx
>Subject:        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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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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