The ST4209 Square Kilometre

ST4209 National Grid Square

Based in the South West English Region.

The ST4209 square kilometre intersects with the settlement of Roundham.

ST4209 is within the post town of Crewkerne, Somerset.

The square is within South Somerset District council.

The Point of Origin (0,0) is 358.95 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for ST4209

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Map Series	link	Ordnance Survey
Explorer 1:25,000 116 Lyme Regis and Bridport	Shop for this map on amazon.co.uk	Buy Direct from the 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 1:50,000 193 Taunton & Lyme Regis	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 ST4209 and the vertical and horizontal line divides the square into four quadrants

Dividing the ST4209 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 , 42 and 09

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 + 42 + 3 + 09 + 5 would give you the six figure grid reference of ST423095

ST	42		09
ST	42	3	09	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	50.877563	-2.825914	342000	109000
South East Corner	50.877563	-2.811542	343000	109000
North West Corner	50.886654	-2.825914	342000	110000
North East Corner	50.886654	-2.811542	343000	110000