The SN5906 Square Kilometre

SN5906 National Grid Square

Based in the Mid and West Wales region of Scotland & South Wales West region of Scotland.

SN5906 is within the post town of Swansea, Glamorgan.

The square is within Abertawe - Swansea & Sir Gaerfyrddin - Carmarthenshire councils.

The Point of Origin (0,0) is 330.93 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for SN5906

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Map Series	link	Ordnance Survey
Explorer 1:25,000 165 Swansea, Neath and Port Talbot	Shop for this map on amazon.co.uk
Explorer 1:25,000 178 Llanelli and Ammanford/Rhydaman	Shop for this map on amazon.co.uk
Landranger 1:50,000 159 Swansea & Gower	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 SN5906 and the vertical and horizontal line divides the square into four quadrants

Dividing the SN5906 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. SN , 59 and 06

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 SN + 59 + 3 + 06 + 5 would give you the six figure grid reference of SN593065

SN	59		06
SN	59	3	06	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	51.734930	-4.043710	259000	206000
South East Corner	51.734930	-4.028833	260000	206000
North West Corner	51.744167	-4.043710	259000	207000
North East Corner	51.744167	-4.028833	260000	207000