The SP2501 Square Kilometre

SP2501 National Grid Square

Based in the South East English Region.

SP2501 is within the post towns of Bampton, Oxfordshire & Lechlade, Gloucestershire.

The square is within West Oxfordshire District council.

The Point of Origin (0,0) is 470.13 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for SP2501

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Map Series	link	Ordnance Survey
Explorer 1:25,000 ol45 The Cotswolds	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 163 Cheltenham & Cirencester	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 SP2501 and the vertical and horizontal line divides the square into four quadrants

Dividing the SP2501 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. SP , 25 and 01

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 SP + 25 + 3 + 01 + 5 would give you the six figure grid reference of SP253015

SP	25		01
SP	25	3	01	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	51.707144	-1.639589	425000	201000
South East Corner	51.707144	-1.625043	426000	201000
North West Corner	51.716181	-1.639589	425000	202000
North East Corner	51.716181	-1.625043	426000	202000