The NS3721 Square Kilometre

NS3721 National Grid Square

Based in the South Scotland region of Scotland.

NS3721 is within the post town of Ayr, Ayrshire.

The square is within South Ayrshire council.

The Point of Origin (0,0) is 664.69 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for NS3721

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Map Series	link	Ordnance Survey
Explorer 1:25,000 326 Ayr and Troon		Buy Direct from the Ordnance Survey
Landranger 1:50,000 70 Ayr & Kilmarnock	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 NS3721 and the vertical and horizontal line divides the square into four quadrants

Dividing the NS3721 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. NS , 37 and 21

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 NS + 37 + 3 + 21 + 5 would give you the six figure grid reference of NS373215

NS	37		21
NS	37	3	21	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	55.455630	-4.579771	237000	621000
South East Corner	55.455630	-4.563389	238000	621000
North West Corner	55.464938	-4.579771	237000	622000
North East Corner	55.464938	-4.563389	238000	622000