The ST7520 Square Kilometre

ST7520 National Grid Square

Based in the South West English Region.

The ST7520 square kilometre intersects with the settlement of Henstridge Marsh.

ST7520 is within the post towns of Gillingham, Dorset, Sturminster Newton, Dorset & Templecombe, Somerset.

The square is within Dorset & South Somerset District councils.

The Point of Origin (0,0) is 393.73 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for ST7520

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Map Series	link	Ordnance Survey
Explorer 1:25,000 129 Yeovil and Sherbourne	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 183 Yeovil & Frome	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 ST7520 and the vertical and horizontal line divides the square into four quadrants

Dividing the ST7520 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 , 75 and 20

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 + 75 + 3 + 20 + 5 would give you the six figure grid reference of ST753205

ST	75		20
ST	75	3	20	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	50.978854	-2.357547	375000	120000
South East Corner	50.978854	-2.343234	376000	120000
North West Corner	50.987889	-2.357547	375000	121000
North East Corner	50.987889	-2.343234	376000	121000