The SU9971 Square Kilometre

SU9971 National Grid Square

Based in the South East English Region.

The SU9971 square kilometre intersects with the settlements of Bishopsgate & Egham.

SU9971 is within the post town of Egham, Surrey.

The square is within Runnymede District council.

The Point of Origin (0,0) is 527.49 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for SU9971

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Map Series	link	Ordnance Survey
Explorer 1:25,000 160 Windsor, Weybridge & Bracknell	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 175 Reading & Windsor	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 176 West London	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 SU9971 and the vertical and horizontal line divides the square into four quadrants

Dividing the SU9971 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. SU , 99 and 71

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 SU + 99 + 3 + 71 + 5 would give you the six figure grid reference of SU993715

SU	99		71
SU	99	3	71	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	51.429191	-0.577330	499000	171000
South East Corner	51.429191	-0.562668	500000	171000
North West Corner	51.438356	-0.577330	499000	172000
North East Corner	51.438356	-0.562668	500000	172000