The ST8649 Square Kilometre

ST8649 National Grid Square

Based in the South West English Region.

The ST8649 square kilometre intersects with the settlement of Westbury.

ST8649 is within the post town of Westbury, Wiltshire.

The square is within Wiltshire council.

The Point of Origin (0,0) is 413.76 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for ST8649

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Map Series	link	Ordnance Survey
Explorer 1:25,000 143 Warminster and Trowbridge	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 183 Yeovil & Frome	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 ST8649 and the vertical and horizontal line divides the square into four quadrants

Dividing the ST8649 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 , 86 and 49

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 + 86 + 3 + 49 + 5 would give you the six figure grid reference of ST863495

ST	86		49
ST	86	3	49	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	51.239999	-2.201965	386000	149000
South East Corner	51.239999	-2.187601	387000	149000
North West Corner	51.249015	-2.201965	386000	150000
North East Corner	51.249015	-2.187601	387000	150000