The SX7138 Square Kilometre

SX7138 National Grid Square

Based in the South West English Region.

SX7138 is within the post town of Kingsbridge, Devon.

The square is within South Hams District council.

The Point of Origin (0,0) is 273.65 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for SX7138

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Map Series	link	Ordnance Survey
Explorer 1:25,000 ol20 South Devon, Brixham to Newton Ferrers	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 202 Torbay & South Dartmoor	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 SX7138 and the vertical and horizontal line divides the square into four quadrants

Dividing the SX7138 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. SX , 71 and 38

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 SX + 71 + 3 + 38 + 5 would give you the six figure grid reference of SX713385

SX	71		38
SX	71	3	38	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	50.227877	-3.810267	271000	38000
South East Corner	50.227877	-3.795914	272000	38000
North West Corner	50.237083	-3.810267	271000	39000
North East Corner	50.237083	-3.795914	272000	39000