The NN3891 Square Kilometre

NN3891 National Grid Square

Based in the Highlands and Islands region of Scotland.

NN3891 is within the post town of Roy Bridge, Inverness-shire.

The square is within Highland council.

The Point of Origin (0,0) is 826.03 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for NN3891

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Map Series	link	Ordnance Survey
Explorer 1:25,000 ol55 Loch Laggan & Creag Meagaidh, Corrieyairack Pass	Shop for this map on amazon.co.uk
Explorer 1:25,000 400 Loch Lochy and Glen Roy - Spean Bridge, Invergarry and Fort Augustus
Landranger 1:50,000 34 Fort Augustus & Glen Albyn

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 NN3891 and the vertical and horizontal line divides the square into four quadrants

Dividing the NN3891 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 , 38 and 91

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 + 38 + 3 + 91 + 5 would give you the six figure grid reference of NN383915

NN	38		91
NN	38	3	91	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	56.981693	-4.668026	238000	791000
South East Corner	56.981693	-4.650948	239000	791000
North West Corner	56.991016	-4.668026	238000	792000
North East Corner	56.991016	-4.650948	239000	792000