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

["Chris Strizver" <strizver@xxxxxxxx>]

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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