The ST8772 Square Kilometre

ST8772 National Grid Square

Based in the South West English Region.

ST8772 is within the post towns of Chippenham, Wiltshire & Corsham, Wiltshire.

The square is within Wiltshire council.

The Point of Origin (0,0) is 423.50 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for ST8772

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Map Series	link	Ordnance Survey
Explorer 1:25,000 156 Chippenham and Bradford-on-Avon	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 173 Swindon & Devizes	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 ST8772 and the vertical and horizontal line divides the square into four quadrants

Dividing the ST8772 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. ST , 87 and 72

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 ST + 87 + 3 + 72 + 5 would give you the six figure grid reference of ST873725

ST	87		72
ST	87	3	72	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	51.446835	-2.188486	387000	172000
South East Corner	51.446835	-2.174059	388000	172000
North West Corner	51.455849	-2.188486	387000	173000
North East Corner	51.455849	-2.174059	388000	173000