The TL4240 Square Kilometre

TL4240 National Grid Square

Based in the Eastern English Region.

The TL4240 square kilometre intersects with the settlement of Heydon.

TL4240 is within the post town of Royston, Hertfordshire.

The square is within South Cambridgeshire District council.

The Point of Origin (0,0) is 592.76 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for TL4240

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Map Series	link	Ordnance Survey
Explorer 1:25,000 209 Cambridge, Royston, Duxford & Linton	Shop for this map on amazon.co.uk
Landranger 1:50,000 154 Cambridge & Newmarket	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 TL4240 and the vertical and horizontal line divides the square into four quadrants

Dividing the TL4240 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. TL , 42 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 TL + 42 + 3 + 40 + 5 would give you the six figure grid reference of TL423405

TL	42		40
TL	42	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	52.039975	0.068967	542000	240000
South East Corner	52.039975	0.083954	543000	240000
North West Corner	52.049216	0.068967	542000	241000
North East Corner	52.049216	0.083954	543000	241000