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How to convert lat/long into UK Ordnance Survey grid references.

 
 
Peter Hamilton-Scott
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      07-23-2003, 06:12 PM
Guys,



I've got, for me at least, an interesting question about the transformation
of lat/long into UK Ordnance Survey coordinates. Right now, I'm at home and
using the Ordnance Survey Explorer 134 map 1:25000 (2.5 inches to 1 mile),
my map coordinates are roughly TQ279366. In GPS terms and using the marks
printed on the map, that's very roughly longitude 0 deg 11 min N, latitude
51 deg 7 min W. I will have one hell of a job transforming lat/long into
Ordnance Survey grid references if I have to do it.



That's the problem. What are my options?



Is there some 'magical' feature of a GPS receiver that will do the
conversion for me? I'd like to do the conversion both ways. FWIW I'm looking
at the Garmin iQue 3600 in a couple of months when it becomes available,
maybe.



Is what I'm looking to do achieved by uploading maps onto the GPS and that
somehow will perform all the magic for me?



If it is done by loading maps I know Garmin offer maps on CDs. What I don't
know is if the Garmin maps offer the Ordnance Survey maps on CD? I can't
really find anything on the Ordnance Survey website that suggests you can
upload Ordnance Survey maps onto Garmin receivers and I think what is
available is limited to main tourist areas like national parks.



Do you guys have opinions on this? I'm pretty darned sure, that someone in
the UK has asked a similar question themself and possibly knows the answer?



Help appreciated.



Peter.


 
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Stephen Clark
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      07-23-2003, 08:39 PM

"Peter Hamilton-Scott" <(E-Mail Removed)> wrote
in message news:3f1ed004$0$2878$(E-Mail Removed).. .
> Guys,
>
>
>
> I've got, for me at least, an interesting question about the

transformation
> of lat/long into UK Ordnance Survey coordinates. Right now, I'm at home

and
> using the Ordnance Survey Explorer 134 map 1:25000 (2.5 inches to 1 mile),
> my map coordinates are roughly TQ279366. In GPS terms and using the marks
> printed on the map, that's very roughly longitude 0 deg 11 min N, latitude
> 51 deg 7 min W. I will have one hell of a job transforming lat/long into
> Ordnance Survey grid references if I have to do it.
>
>

Visit www.gps.gov.uk and download the conversion spreadsheet. Using that you
can convert either way.




---
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Checked by AVG anti-virus system (http://www.grisoft.com).
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Norman
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      07-23-2003, 08:50 PM
On Wed, 23 Jul 2003 19:12:22 +0100, "Peter Hamilton-Scott"
<(E-Mail Removed)> wrote:

>Guys,
>
>
>
>I've got, for me at least, an interesting question about the transformation
>of lat/long into UK Ordnance Survey coordinates. Right now, I'm at home and
>using the Ordnance Survey Explorer 134 map 1:25000 (2.5 inches to 1 mile),
>my map coordinates are roughly TQ279366. In GPS terms and using the marks
>printed on the map, that's very roughly longitude 0 deg 11 min N, latitude
>51 deg 7 min W. I will have one hell of a job transforming lat/long into
>Ordnance Survey grid references if I have to do it.
>
>
>
>That's the problem. What are my options?

Why do you want to convert one to the other?
Just enter your coordinates in what ever format is easiest on the map
you are using. On an ordnance survey map that would be in British
National Grid. Using a tool like a roamer for a 6 figure reference
makes the job easier. Nautical charts are in Lat/Lon (deg, mins and
secs).
Once you have entered the coodinates and stored the waypoint you can
reference it in any of the grids or Lat/Lon by going into setup and
altering your GPS settings to read whatever coordinates you want that
are listed.

Norman

 
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Peter Hamilton-Scott
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      07-24-2003, 06:26 AM
I don't really want to, that's my point. But if GPS receivers only do
lat/long then that's not very useful if I want to roam around with OS maps.
It seems if I read understnad it rightly, that I'd need some software from
the OS and that means doing something in addition. I just thought and
wondered if the GPS recievers do the work for me, but it seems I have to.

> Once you have entered the coodinates and stored the waypoint you can
> reference it in any of the grids or Lat/Lon by going into setup and
> altering your GPS settings to read whatever coordinates you want that
> are listed.


This suggests the GPS unit does indeed do the work? Or some models only?

Peter.

"Norman" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> On Wed, 23 Jul 2003 19:12:22 +0100, "Peter Hamilton-Scott"
> <(E-Mail Removed)> wrote:
>
> >Guys,
> >
> >
> >
> >I've got, for me at least, an interesting question about the

transformation
> >of lat/long into UK Ordnance Survey coordinates. Right now, I'm at home

and
> >using the Ordnance Survey Explorer 134 map 1:25000 (2.5 inches to 1

mile),
> >my map coordinates are roughly TQ279366. In GPS terms and using the marks
> >printed on the map, that's very roughly longitude 0 deg 11 min N,

latitude
> >51 deg 7 min W. I will have one hell of a job transforming lat/long into
> >Ordnance Survey grid references if I have to do it.
> >
> >
> >
> >That's the problem. What are my options?

> Why do you want to convert one to the other?
> Just enter your coordinates in what ever format is easiest on the map
> you are using. On an ordnance survey map that would be in British
> National Grid. Using a tool like a roamer for a 6 figure reference
> makes the job easier. Nautical charts are in Lat/Lon (deg, mins and
> secs).
> Once you have entered the coodinates and stored the waypoint you can
> reference it in any of the grids or Lat/Lon by going into setup and
> altering your GPS settings to read whatever coordinates you want that
> are listed.
>
> Norman
>



 
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Alan White
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      07-24-2003, 08:19 AM
On Wed, 23 Jul 2003 19:12:22 +0100, "Peter Hamilton-Scott"
<(E-Mail Removed)> wrote:

>...
>That's the problem. What are my options?
>...


All readily available consumer hand-held GPSRs will display an
Ordnance Survey Grid Reference and can be set to the OSGB datum. They
will also display Lat/Long in various formats and a number of other
grids in many datums.

Your only problem, as I see it, is to decide which model to buy. This
will depend on the depth of your pocket and your intended use.

In my experience the average 'outdoor' shop will be able to tell you
the price and not much else. That price will not be the cheapest. Talk
to a specialist dealer like GPS Warehouse, http://www.gpsw.co.uk or
GPS4less, http://www.gps4less.co.uk, whose site seems to be down at
the moment.

HTH

--
Alan White
Twenty-eight miles NW of Glasgow.
Overlooking Loch Goil and Loch Long in Argyll, Scotland.
http://tinyurl.com/55v3
 
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Doug Adomatis
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      07-24-2003, 10:24 AM
"Peter Hamilton-Scott" wrote:
> What are my options?

Peter,
An online utility to convert between British Postal Costal Codes/OS
Grid/Latitude-Longitude can be found at
http://www.streetmap.co.uk
I hope this helps!
- Doug
www.travelbygps.com


 
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Dave Patton
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      07-24-2003, 02:30 PM
"Peter Hamilton-Scott" <(E-Mail Removed)>
wrote in news:3f1f7ca7$0$14561$(E-Mail Removed):

> How do I know for sure Dave what options each model of GPS supports? I
> get conflicting advice from UK dealers who probably know the basics to
> sell, but don't know much more than that.


- only buy from knowledgeable dealers, who, if they don't
know an answer, will find it, not make something up
- test out the GPS at the dealer's store(inside and/or outside)
to look to see if the features you want are available
- look at the manufactrer's specs sheets online, and if the
answer isn't there, contact the manufacturer
- use google to do a search for comments about the receivers
you are interested in
- check for information online that might give you the answer
For example, the comparison matrix at GPS Central(Canada)
has a bit more info than Garmin's comparison matrix:
http://www.gpscentral.ca/products/ga...Comparison.htm
- post a question here about whether a specific model or models
have a certain feature you need
Depending on what you want to know, you may also want to
use the sci.geo.satellite-nav newsgroup, but:
- if you are going to ask a question in both, use crossposting
- do some research first :-)

--
Dave Patton
Canadian Coordinator, the Degree Confluence Project
http://www.confluence.org dpatton at confluence dot org
My website: http://members.shaw.ca/davepatton/
Vancouver/Whistler - host of the 2010 Winter Olympics
 
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Stuart
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      07-25-2003, 08:38 PM
Last digit (on 10 fig Grid References) is one metre.

http://www.gps.gov.uk/natgrid/page1.asp

TQ 3 7 10 km by 10 km square
TQ 38 77 1 km by 1 km square
TQ 388 773 100m by 100m square
TQ 3885 7734 10m by 10m square
TQ 38852 77345 1m by 1m square


"Roger Shilcock" <(E-Mail Removed)> wrote in message
news:Xns93C26D18AB1C4shilcorukibmcom@9.20.142.8...

> I did notice when looking at cache coordinates on
> www.geocaching.com that are qouted in both WGS84 and British National Grid
> formats that there was a very slight difference between my GPS and their
> BNG figures (1 digit different on the end of the BNG figures) but I don't
> know what that would equate to in terms of positional accuracy. I always
> work in WGS84 and haven't had a problem finding any caches so far :-)
>
> --
> Roger Shilcock
>



 
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