The ST7781 Square Kilometre

ST7781 National Grid Square

Based in the South West English Region.

ST7781 is within the post towns of Badminton, Gloucestershire & Bristol, Gloucestershire.

The square is within South Gloucestershire council.

The Point of Origin (0,0) is 418.20 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for ST7781

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Map Series	link	Ordnance Survey
Explorer 1:25,000 155 Bristol and Bath	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Explorer 1:25,000 168 Stroud, Tetbury and Malmesbury	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Explorer 1:25,000 167 Thornbury, Dursley and Yate	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 172 Bristol & Bath	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 ST7781 and the vertical and horizontal line divides the square into four quadrants

Dividing the ST7781 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. ST , 77 and 81

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 ST + 77 + 3 + 81 + 5 would give you the six figure grid reference of ST773815

ST	77		81
ST	77	3	81	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	51.527437	-2.332996	377000	181000
South East Corner	51.527437	-2.318516	378000	181000
North West Corner	51.536469	-2.332996	377000	182000
North East Corner	51.536469	-2.318516	378000	182000