The SX4791 Square Kilometre

SX4791 National Grid Square

Based in the South West English Region.

SX4791 is within the post town of Okehampton, Devon.

The square is within West Devon District council.

The Point of Origin (0,0) is 263.23 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for SX4791

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Map Series	link	Ordnance Survey
Explorer 1:25,000 112 Launceston and Holsworthy	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 191 Okehampton & North 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 SX4791 and the vertical and horizontal line divides the square into four quadrants

Dividing the SX4791 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 , 47 and 91

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 + 47 + 3 + 91 + 5 would give you the six figure grid reference of SX473915

SX	47		91
SX	47	3	91	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	50.698456	-4.168262	247000	91000
South East Corner	50.698456	-4.153698	248000	91000
North West Corner	50.707704	-4.168262	247000	92000
North East Corner	50.707704	-4.153698	248000	92000