The NN0171 Square Kilometre

NN0171 National Grid Square

Based in the Highlands and Islands region of Scotland.

NN0171 is within the post town of Fort William, Inverness-shire.

The square is within Highland council.

The Point of Origin (0,0) is 796.77 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for NN0171

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Map Series	link	Ordnance Survey
Explorer 1:25,000 391 Ardgour and Strontian		Buy Direct from the Ordnance Survey
Landranger 1:50,000 41 Ben Nevis, Fort William	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 NN0171 and the vertical and horizontal line divides the square into four quadrants

Dividing the NN0171 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 , 01 and 71

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 + 01 + 3 + 71 + 5 would give you the six figure grid reference of NN013715

NN	01		71
NN	01	3	71	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	56.787870	-5.260313	201000	771000
South East Corner	56.787870	-5.243192	202000	771000
North West Corner	56.797265	-5.260313	201000	772000
North East Corner	56.797265	-5.243192	202000	772000