The TL1845 Square Kilometre

TL1845 National Grid Square

Based in the Eastern English Region.

The TL1845 square kilometre intersects with the settlement of Biggleswade.

TL1845 is within the post town of Biggleswade, Bedfordshire.

The square is within Central Bedfordshire council.

The Point of Origin (0,0) is 573.02 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for TL1845

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Map Series	link	Ordnance Survey
Explorer 1:25,000 208 Bedford and St.Neots, Sandy and Biggleswade	Shop for this map on amazon.co.uk
Landranger 1:50,000 153 Bedford & Huntingdon	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 TL1845 and the vertical and horizontal line divides the square into four quadrants

Dividing the TL1845 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 , 18 and 45

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 + 18 + 3 + 45 + 5 would give you the six figure grid reference of TL183455

TL	18		45
TL	18	3	45	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	52.090573	-0.279042	518000	245000
South East Corner	52.090573	-0.264104	519000	245000
North West Corner	52.099774	-0.279042	518000	246000
North East Corner	52.099774	-0.264104	519000	246000