The SO2139 Square Kilometre

SO2139 National Grid Square

Based in the Mid and West Wales region of Scotland.

The SO2139 square kilometre intersects with the settlement of Llanigon.

SO2139 is within the post town of Hereford, Herefordshire.

The square is within Powys - Powys council.

The Point of Origin (0,0) is 400.20 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for SO2139

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Map Series	link	Ordnance Survey
Explorer 1:25,000 ol13 Brecon Beacons National Park - Eastern area	Shop for this map on amazon.co.uk
Landranger 1:50,000 148 Presteigne & Hay-on-Wye	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 161 Abergavenny & The Black Mountains	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey

This extract is taken from the Ordnance Survey six-inch to the mile series surveyed from 1888-1913. The scale is 1:10,560.

The Square overlayed over the map represents the extent of SO2139 and the vertical and horizontal line divides the square into four quadrants

Dividing the SO2139 Square to get a six figure Grid Reference

A helpful reminder for calculating grid references is across the landing and up the stairs.

For example if your house was located in a square that in the fourth square across and sixth square up and you wanted to work out its six figure grid refence.

First, You would divide the four figure grid reference into three parts. SO , 21 and 39

Count across starting with zero. This would give you three. Make a note that X for Across (A Cross) = 3.

Count up starting with zero. This would give you five. Make a note that Y = 5.

So to put it together SO + 21 + 3 + 39 + 5 would give you the six figure grid reference of SO213395

SO	21		39
SO	21	3	39	5

A six figure grid reference would be accurate to 10 metres. To achieve a greater level of accuracy this 10 metre square would be divided into a grid 10 by 10 and the process repeated.

This would produce an 8 figure grid reference that would be accurate to a square metre!

Corner	Latitude	Longitude	Easting	Northing
South West Corner	52.043751	-3.153514	321000	239000
South East Corner	52.043751	-3.138705	322000	239000
North West Corner	52.052881	-3.153514	321000	240000
North East Corner	52.052881	-3.138705	322000	240000