The SU4990 Square Kilometre

SU4990 National Grid Square

Based in the South East English Region.

SU4990 is within the post towns of Abingdon, Berkshire & Didcot, Berkshire.

The square is within Vale of White Horse District council.

The Point of Origin (0,0) is 487.55 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for SU4990

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Map Series	link	Ordnance Survey
Explorer 1:25,000 170 Abingdon, Wantage and Vale of White Horse	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 164 Oxford	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 174 Newbury & Wantage	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 SU4990 and the vertical and horizontal line divides the square into four quadrants

Dividing the SU4990 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 , 49 and 90

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 + 49 + 3 + 90 + 5 would give you the six figure grid reference of SU493905

SU	49		90
SU	49	3	90	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	51.606626	-1.293819	449000	190000
South East Corner	51.606626	-1.279238	450000	190000
North West Corner	51.615704	-1.293819	449000	191000
North East Corner	51.615704	-1.279238	450000	191000