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Garmin Etrex problem!

 
 
Kevin Howell
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      04-24-2004, 12:42 PM
When I look at the grid reference of my actual position on the etrex I am
acurate on the eastings but up to 1/3mile out on the northings.
On the Units page the settings are:
Position Format : British Grid
Map Datum :WGS 84
Units :Statute
North Ref :True

Is it because my map is dated or is there another setting I have overlooked.

Cheers Kev


 
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Matthew Davis
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      04-24-2004, 03:07 PM
Your Map Datum should be set to Ord Srvy GB.

"Kevin Howell" <(E-Mail Removed)> wrote in message
news:408a60c5$(E-Mail Removed)...
> When I look at the grid reference of my actual position on the etrex I am
> acurate on the eastings but up to 1/3mile out on the northings.
> On the Units page the settings are:
> Position Format : British Grid
> Map Datum :WGS 84
> Units :Statute
> North Ref :True
>
> Is it because my map is dated or is there another setting I have

overlooked.
>
> Cheers Kev
>
>



 
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Dirk G. Straka
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      04-24-2004, 03:20 PM
Hi Kevin Howell,

thus spoke Kevin Howell:
> When I look at the grid reference of my actual position on the
> etrex I am acurate on the eastings but up to 1/3mile out on the
> northings.


Compared to what?

> On the Units page the settings are:
> Position Format : British Grid
> Map Datum : WGS 84
> Units : Statute
> North Ref : True
>
> Is it because my map is dated or is there another setting I
> have overlooked.


Try position format hddd.dddd° or hddd°mm'ss.s" - that's mostly
used.

Greets, Dirk
 
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Dave Patton
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      04-24-2004, 05:03 PM
"Kevin Howell" <(E-Mail Removed)> wrote in
news:408a60c5$(E-Mail Removed):

> When I look at the grid reference of my actual position on the etrex I
> am acurate on the eastings but up to 1/3mile out on the northings.
> On the Units page the settings are:
> Position Format : British Grid
> Map Datum :WGS 84
> Units :Statute
> North Ref :True
>
> Is it because my map is dated or is there another setting I have
> overlooked.


Well, we would be guessing, as you haven't said what you were
comparing the GPS position to. Regardless, it's likely that what
you have wrong is the Datum. In many situations, unless you use
the same datum on the GPS that was used to make the map(or whatever
you are referencing), you're position won't "match up".
In the UK, you should probably be using the Ordnance Survey
Great Britian(OSGB) datum, not WGS84, particularly if you are
checking your position on OSGB maps.

--
Dave Patton
Canadian Coordinator, Degree Confluence Project
http://www.confluence.org/
My website: http://members.shaw.ca/davepatton/
 
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Kevin Howell
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      04-24-2004, 06:57 PM
Thanks to everybody for their help, particularly Dave Patton, as when I
changed to OSGB my Etrex was suddenly accurate. Cheers again everyone....Kev



"Dave Patton" <(E-Mail Removed)> wrote in message
news:Xns94D5665C54A90mrzaphoddirectcaold@24.71.223 .159...
> "Kevin Howell" <(E-Mail Removed)> wrote in
> news:408a60c5$(E-Mail Removed):
>
> > When I look at the grid reference of my actual position on the etrex I
> > am acurate on the eastings but up to 1/3mile out on the northings.
> > On the Units page the settings are:
> > Position Format : British Grid
> > Map Datum :WGS 84
> > Units :Statute
> > North Ref :True
> >
> > Is it because my map is dated or is there another setting I have
> > overlooked.

>
> Well, we would be guessing, as you haven't said what you were
> comparing the GPS position to. Regardless, it's likely that what
> you have wrong is the Datum. In many situations, unless you use
> the same datum on the GPS that was used to make the map(or whatever
> you are referencing), you're position won't "match up".
> In the UK, you should probably be using the Ordnance Survey
> Great Britian(OSGB) datum, not WGS84, particularly if you are
> checking your position on OSGB maps.
>
> --
> Dave Patton
> Canadian Coordinator, Degree Confluence Project
> http://www.confluence.org/
> My website: http://members.shaw.ca/davepatton/



 
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Graham W
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      04-26-2004, 04:18 AM
Kevin Howell wrote:

> When I look at the grid reference of my actual position on the etrex I am
> acurate on the eastings but up to 1/3mile out on the northings.
> On the Units page the settings are:
> Position Format : British Grid
> Map Datum :WGS 84
> Units :Statute
> North Ref :True
>
> Is it because my map is dated or is there another setting I have overlooked.


Your map datum is incorrect.
For British National Grid, you need to use the Ordinance Survey Great
Britain datum.
 
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