The SD7127 Square Kilometre

SD7127 National Grid Square

Based in the North West English Region.

The SD7127 square kilometre intersects with the settlement of Blackburn.

SD7127 is within the post towns of Accrington, Lancashire & Blackburn, Lancashire.

The square is within Blackburn with Darwen & Hyndburn District councils.

The Point of Origin (0,0) is 565.66 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for SD7127

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Map Series	link	Ordnance Survey
Explorer 1:25,000 287 West Pennine Moors - Blackburn, Darwen and Accrington	Shop for this map on amazon.co.uk
Landranger 1:50,000 103 Blackburn & Burnley	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 SD7127 and the vertical and horizontal line divides the square into four quadrants

Dividing the SD7127 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. SD , 71 and 27

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 SD + 71 + 3 + 27 + 5 would give you the six figure grid reference of SD713275

SD	71		27
SD	71	3	27	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	53.738586	-2.441224	371000	427000
South East Corner	53.738586	-2.425970	372000	427000
North West Corner	53.747629	-2.441224	371000	428000
North East Corner	53.747629	-2.425970	372000	428000