The ST5170 Square Kilometre

ST5170 National Grid Square

Based in the South West English Region.

The ST5170 square kilometre intersects with the settlement of Failand.

ST5170 is within the post town of Bristol, Gloucestershire.

The square is within North Somerset council.

The Point of Origin (0,0) is 390.00 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for ST5170

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Map Series	link	Ordnance Survey
Explorer 1:25,000 154 Bristol West and Portishead	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 ST5170 and the vertical and horizontal line divides the square into four quadrants

Dividing the ST5170 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 , 51 and 70

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 + 51 + 3 + 70 + 5 would give you the six figure grid reference of ST513705

ST	51		70
ST	51	3	70	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	51.426874	-2.706310	351000	170000
South East Corner	51.426874	-2.691789	352000	170000
North West Corner	51.435951	-2.706310	351000	171000
North East Corner	51.435951	-2.691789	352000	171000