The ST7420 Square Kilometre

ST7420 National Grid Square

Based in the South West English Region.

The ST7420 square kilometre intersects with the settlement of Henstridge Marsh.

ST7420 is within the post towns of Sturminster Newton, Dorset & Templecombe, Somerset.

The square is within South Somerset District council.

The Point of Origin (0,0) is 392.78 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for ST7420

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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 ST7420 and the vertical and horizontal line divides the square into four quadrants

Dividing the ST7420 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 , 74 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 + 74 + 3 + 20 + 5 would give you the six figure grid reference of ST743205

ST	74		20
ST	74	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	50.978810	-2.371794	374000	120000
South East Corner	50.978810	-2.357478	375000	120000
North West Corner	50.987846	-2.371794	374000	121000
North East Corner	50.987846	-2.357478	375000	121000