[gps-talkusers] Re: Selective Availability and DGPS

No that helps but I still thought uncorrected GPS even with out the fudge factor included had a much greater rate of deviation than 10M, depending on conditions of course. Interesting thanks for the detail.
----- Original Message ----- From: "Kevin Chao" <kevinchao89@xxxxxxxxx> 
To: <gps-talkusers@xxxxxxxxxxxxx>
Sent: Friday, April 25, 2008 12:11 PM
Subject: [gps-talkusers] Selective Availability and DGPS



Scott,
The 100 meters of inaccuracy that you are refering to is no longer in effect 
as of May 1, 2000. This  is a feature known as Selective Availability (SA)
and is included in all GPS, which is currently disabled. This was something that teh military enabled that scrambled the signals making the publically 
acessible signals very inaccurate.
Today, without corrected signals, the horizontal accuracy can be 10 meters 
on average and the vertical accuracy can be 30 meters on average.
If one is taking advantage of the Differential GPS signals (DGPS), then the horizontal accuracy can be as as good as 3 meters. DGPS is known as the WAAS 
reading in Northern America and EGNOS in Europe and other locations. I
beleive that the EGNOS is something that is still in the works.
I apologize for the long and technical response but wanted to clear up any 
possible confusion.

Kevin



-----Original Message-----
From: gps-talkusers-bounce@xxxxxxxxxxxxx
[mailto:gps-talkusers-bounce@xxxxxxxxxxxxx] On Behalf Of Scott Granados
Sent: Friday, April 25, 2008 11:16 AM
To: gps-talkusers@xxxxxxxxxxxxx
Subject: [gps-talkusers] Re: The M1000 & wayfinder access
You know, if you're not getting a corrected signal you could be off as much 
as 100 meters.
----- Original Message ----- From: "Kim Lookingbill" <seadolphink@xxxxxxxxxxx> 
To: <gps-talkusers@xxxxxxxxxxxxx>
Sent: Friday, April 25, 2008 11:16 AM
Subject: [gps-talkusers] Re: The M1000 & wayfinder access



Hi: - I guess then it must be bad mapping since this is the suburbs and
not
downtown with real tall buildings to bounce off, although there's lots of
buildings.  Also the roads it reports do not even intersect with the road
I'm on, though as I stated previously the two roads do run parallell to
each
other but a block or two apart.  I'm gonna do some more testing by taking
my
n1000 with my braille note and see if I get the same results or not. I'll 
let you know when I do, though this won't be until Monday or Tuesday when
I
can do so.  Thanks for the response..

Kim Lookingbill
kim@xxxxxxxxxxxx (email or MSN Messenger)

Blast From The Past
Sundays, 16 to 19 UTC

http://interactive.acbradio.org


-----Original Message-----
From: gps-talkusers-bounce@xxxxxxxxxxxxx
[mailto:gps-talkusers-bounce@xxxxxxxxxxxxx] On Behalf Of Kevin Chao
Sent: Thursday, April 24, 2008 8:42 PM
To: gps-talkusers@xxxxxxxxxxxxx
Subject: [gps-talkusers] Re: The M1000 & wayfinder access


Kim,

Is  this issue of WayFinder Access reporting you as being  several blocks
from where you are specific to this area or is it something that happens
to
a greater extent? This could be an issue of poor map data or GPS drift,
which is caused  from  signals  bouncing off of tall or very tall
buildings.
If it is something specific to this area and there are tall buildings then it could be an issue of GPS drift. But if it is something that is specific 
to this area and there aren't tall buildings then the issue could be poor
mapping data. I have never experienced the Sendero GPS reporting me to be
no
more than 2 blocks at most off and that is in situations where multi-path
and drift are at its worst in San Francisco with sky scrapers.

Please provide us with more  information about the situation so we can
narrow down on what is happening.

Kevin

-----Original Message-----
From: gps-talkusers-bounce@xxxxxxxxxxxxx
[mailto:gps-talkusers-bounce@xxxxxxxxxxxxx] On Behalf Of Kim Lookingbill
Sent: Thursday, April 24, 2008 4:18 PM
To: gps-talkusers@xxxxxxxxxxxxx
Subject: [gps-talkusers] Re: The M1000 & wayfinder access

Hi: - When using the N1000 with wayfinder access is there any way to
adjust
the reciever's viewing distance.  I'm finding that the reciever is
reaching
to far out and is reporting streets several streets over instead of the
actual streets being driven past.  For example: here in the DC metro area
if
I'm travelling down Rt. #270 (running parallell to Rt. #270 is Rt. #355,
however, the street itself is several blocks over), so I'm on Rt. #270,
the
N1000 reads pois and cross street on Rt. #355, instead of what I'm
actually
passing on Rt. #270.  Oh yes, and just a little trivia for everyone, Rt.
#355 is a road that travels through Montgomery County from the district to 
the frederick county line; going north to south, and although it's the
same
road, it name changes four (4) times depending on the portion of road you
are on.  The four different names starting at the district line are: (1.)
wisconsin avenue, (2.) rockville pike, (3.) hungerford drive, (4.)
frederick
road.  So if there are any hints, tips, or tricks to narrow its scope of
view, that would be smashing. Thanks.

Kim Lookingbill
kim@xxxxxxxxxxxx (email or MSN Messenger)

Blast From The Past
Sundays, 16 to 19 UTC

http://interactive.acbradio.org


-----Original Message-----
From: gps-talkusers-bounce@xxxxxxxxxxxxx
[mailto:gps-talkusers-bounce@xxxxxxxxxxxxx] On Behalf Of Michael May
Sent: Thursday, April 24, 2008 2:09 PM
To: gps-talkusers@xxxxxxxxxxxxx; gps-talkusers@xxxxxxxxxxxxx
Subject: [gps-talkusers] Re: The M1000


The receiver would perform the same no matter which PDA you used it with.
It
is pretty darn sensitive.
I would remind users that the number of satellites isn't the final word on 
the accuracy. If you are getting satellites inside or in an urban canyon
situation, the number of satellites might be high but the quality of
signal
will be degraded. Always doublecheck the information if accuracy matters.

Mike

At 05:52 AM 4/24/2008, Wendy Slominsky wrote:

Are you using this with PK or the like?
At 06:31 AM 4/24/2008, you wrote:

I thought I'd never be able to use the GPS in our new train carriages
(nothing else does), but so long as I have it turned on before I get
on the train the M1000 works perfectly.  Best investment I ever made.

Judi



----------
From: meearls@xxxxxxx
To: gps-talkusers@xxxxxxxxxxxxx
Subject: [gps-talkusers] Receiver Question:
Date: Wed, 23 Apr 2008 19:06:32 -0700

Usually when I use a receiver in the car, I leave it on the strap,
however yesterday, I was using a Voice Sense with Sense Nav and did
have the receiver up against the car window. It was super neat because
Sense Nav overwrote the route that had been automatically programmed
into it before I went to the cell phone store.
With the Holux m1000, I have had a reading of 8 satellites clear
across the living room from the patio door.
Mary Ellen Earls



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Michael G. May

CEO Sendero Group

"The GPS company:" Sendero Featuring GPS on the mPower, PK and Voice
Sense.
Also distributing Trekker, Victor Stream, KNFB Mobile Reader, Talks,,
Tiger
embossers, Miniguide and ID Mate

Crashing Through by Robert Kurson available at
http://www.CrashingThrough.com

MikeMay@xxxxxxxxxxxxxxxx
http://www.SenderoGroup.com

1-888-757-6810, Fax (530) 757-6830, Mobile (530) 304-0007 Sendero Group,
LLC
1118 Maple Lane, Davis, CA 95616-1723, USA



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