The ST3403 Square Kilometre

ST3403 National Grid Square

Based in the South West English Region.

ST3403 is within the post town of Chard, Somerset.

The square is within Dorset council.

The Point of Origin (0,0) is 349.52 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for ST3403

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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
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 ST3403 and the vertical and horizontal line divides the square into four quadrants

Dividing the ST3403 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 , 34 and 03

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 + 34 + 3 + 03 + 5 would give you the six figure grid reference of ST343035

ST	34		03
ST	34	3	03	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	50.822753	-2.938547	334000	103000
South East Corner	50.822753	-2.924172	335000	103000
North West Corner	50.831858	-2.938547	334000	104000
North East Corner	50.831858	-2.924172	335000	104000