The SK4640 Square Kilometre

SK4640 National Grid Square

Based in the East Midlands English Region.

The SK4640 square kilometre intersects with the settlement of Ilkeston.

SK4640 is within the post town of Ilkeston, Derbyshire.

The square is within Erewash District council.

The Point of Origin (0,0) is 560.82 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for SK4640

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Map Series	link	Ordnance Survey
Explorer 1:25,000 260 Nottingham, Vale of Belvoir	Shop for this map on amazon.co.uk
Landranger 1:50,000 129 Nottingham & Loughborough	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 SK4640 and the vertical and horizontal line divides the square into four quadrants

Dividing the SK4640 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. SK , 46 and 40

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 SK + 46 + 3 + 40 + 5 would give you the six figure grid reference of SK463405

SK	46		40
SK	46	3	40	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	52.955343	-1.316726	446000	340000
South East Corner	52.955343	-1.301698	447000	340000
North West Corner	52.964418	-1.316726	446000	341000
North East Corner	52.964418	-1.301698	447000	341000