The TQ2540 Square Kilometre

TQ2540 National Grid Square

Based in the South East English Region.

The TQ2540 square kilometre intersects with the settlement of Gatwick Airport.

TQ2540 is within the post towns of Crawley, Sussex & Horley, Surrey.

The square is within Crawley District & Mole Valley District councils.

The Point of Origin (0,0) is 543.35 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for TQ2540

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Map Series	link	Ordnance Survey
Explorer 1:25,000 146 Dorking, Box Hill and Reigate	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 187 Dorking & Reigate	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 TQ2540 and the vertical and horizontal line divides the square into four quadrants

Dividing the TQ2540 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. TQ , 25 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 TQ + 25 + 3 + 40 + 5 would give you the six figure grid reference of TQ253405

TQ	25		40
TQ	25	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	51.145401	-0.214345	525000	140000
South East Corner	51.145401	-0.199707	526000	140000
North West Corner	51.154608	-0.214345	525000	141000
North East Corner	51.154608	-0.199707	526000	141000