The NN8140 Square Kilometre

NN8140 National Grid Square

Based in the Mid Scotland and Fife region of Scotland.

NN8140 is within the post towns of Aberfeldy, Perthshire & Dunkeld, Perthshire.

The square is within Perth and Kinross council.

The Point of Origin (0,0) is 791.56 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for NN8140

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Map Series	link	Ordnance Survey
Explorer 1:25,000 379 Dunkeld, Aberfeldy and Glen Almond		Buy Direct from the Ordnance Survey
Landranger 1:50,000 52 Pitlochry & Crieff	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 NN8140 and the vertical and horizontal line divides the square into four quadrants

Dividing the NN8140 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. NN , 81 and 40

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 NN + 81 + 3 + 40 + 5 would give you the six figure grid reference of NN813405

NN	81		40
NN	81	3	40	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	56.536882	-3.937091	281000	740000
South East Corner	56.536882	-3.920382	282000	740000
North West Corner	56.546113	-3.937091	281000	741000
North East Corner	56.546113	-3.920382	282000	741000