The ST9825 Square Kilometre

ST9825 National Grid Square

Based in the South West English Region.

ST9825 is within the post town of Salisbury, Wiltshire.

The square is within Wiltshire council.

The Point of Origin (0,0) is 417.17 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for ST9825

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Map Series	link	Ordnance Survey
Explorer 1:25,000 118 Shaftesbury, Cranbourne Chase, Poole, Wimbourne Minster and Blandford	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 184 Salisbury and The Plain	Shop for this map on amazon.co.uk

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 ST9825 and the vertical and horizontal line divides the square into four quadrants

Dividing the ST9825 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 , 98 and 25

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 + 98 + 3 + 25 + 5 would give you the six figure grid reference of ST983255

ST	98		25
ST	98	3	25	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	51.024359	-2.029891	398000	125000
South East Corner	51.024359	-2.015627	399000	125000
North West Corner	51.033354	-2.029891	398000	126000
North East Corner	51.033354	-2.015627	399000	126000