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Mine Exploration Forum

Author Grid Reference
kamca

Joined: 04/11/2014

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Grid Reference
Posted: 06/01/2015 19:25:46
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Hi,
how exact is the Grid Reference? Does it make sense to transfrom it into coordinates and use it to search entrances of mines or not? I'm from abroad and we don't have anything like this here....
Thank you
Kamila
IP: 90.177.166.67
ant89

Joined: 01/04/2013
Location: Wrexham

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Grid Reference
Posted: 06/01/2015 19:34:46
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The classic 6 figure Ordenance survey grid ref is accurate to 100 metres. The more numbers the more accurate. IP: 87.113.120.174
sinker

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Joined: 13/12/2010
Location: North Wales.

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Grid Reference
Posted: 06/01/2015 19:40:59
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Grid ref is only as accurate as the person who entered the mine on the system. Most that I have used do seem to be pretty good....good enough to get you in the "right corner of the right field." Just be careful that the Grid refs that you use are on the same projection as the map or digital model that you use. Most Grid refs are to OSGB1936 but if you plug those straight into, say, a GPS without telling it that they are OSGB36 then you will end up out by miles (varies depending on what part of the world you are in). Different grid/co-ordinate systems are based on different ideas of how big and what shape the world is....

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Can ya dig it? Who's the cat that won't cop out when there's danger all about....? Shaft! IP: 86.155.83.42
kamca

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Grid Reference
Posted: 06/01/2015 21:02:09
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Thank you.
I'm not sure if is my GPS able to use grid, so I'll might prefer to transfer it into classic GPS coordinates. Is following link the right one to use?
http://www.gridreferencefinder.com/
IP: 90.177.166.67
Graigfawr

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Grid Reference
Posted: 06/01/2015 21:03:05
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ant89 wrote:

The classic 6 figure Ordenance survey grid ref is accurate to 100 metres. The more numbers the more accurate.


< puts pedant hat on >

A 6-figure NGR can be misleading by up to 140m if the location is at the extreme NE corner of the 100m square.

< removes pedant hat >
IP: 92.14.157.182
ant89

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Location: Wrexham

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Grid Reference
Posted: 06/01/2015 21:12:43
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Graigfawr wrote:

ant89 wrote:

The classic 6 figure Ordenance survey grid ref is accurate to 100 metres. The more numbers the more accurate.


< puts pedant hat on >

A 6-figure NGR can be misleading by up to 140m if the location is at the extreme NE corner of the 100m square.

< removes pedant hat >


ok Accurate to 100m north-south/ east-west. less accurate on the diaganal Roll Eyes
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Morlock

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Grid Reference
Posted: 06/01/2015 21:32:14
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ant89 wrote:

ok Accurate to 100m north-south/ east-west. less accurate on the diaganal Roll Eyes


It's only accurate to 100 metres North and East as anything South and West is in another 100 metre square.Smartass
IP: 31.48.144.22
sinker

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Grid Reference
Posted: 06/01/2015 21:46:33
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kamca wrote:

Thank you.
I'm not sure if is my GPS able to use grid, so I'll might prefer to transfer it into classic GPS coordinates. Is following link the right one to use?
http://www.gridreferencefinder.com/


I'm looking at this on my phone so can't see too well but it looks ok! Enter grid ref and it gives you co-ordinates which should be OSGB36 (the web site should tell you) and Lat/Long, either of which your GPS should accept?

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Can ya dig it? Who's the cat that won't cop out when there's danger all about....? Shaft! IP: 86.155.83.42
Vanoord

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Joined: 28/11/2005
Location: North Wales

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Grid Reference
Posted: 06/01/2015 22:30:59
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Something like SH123123 (6 figure) is accurate to a 100m square.

Something like SH12341234 (8 figure) is accurate to a 10m square.

Assuming that a 6 figure grid reference is correct, you should have no problem in finding the location, although it might take a few minutes.

If you're travelling from a long way away, then it's worth asking locals for more specific details if you are unsure; or better still getting a local guide.



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Vanoord

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Grid Reference
Posted: 06/01/2015 22:35:42
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kamca wrote:

Thank you.
I'm not sure if is my GPS able to use grid, so I'll might prefer to transfer it into classic GPS coordinates. Is following link the right one to use?
http://www.gridreferencefinder.com/


This seems to work.

--

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kamca

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Grid Reference
Posted: 07/01/2015 08:00:23
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OK, thank you for help. Thumb Up
Page works, I just wnated to ensure if there was a right map. Smile
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crickleymal

Joined: 12/03/2009
Location: Gloucester

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Grid Reference
Posted: 07/01/2015 08:14:38
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You can put an OS grid reference into Streetmap
http://www.streetmap.co.uk/
Then use the Convert Coordinates link at the bottom of the page to give you full grid coords, Lat and Long etc.
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