The NB1812 Square Kilometre

NB1812 National Grid Square

Based in the Highlands and Islands region of Scotland.

NB1812 is within the post towns of Isle Of Harris, Inverness-shire & Isle Of Lewis, Ross-shire.

The square is within Na h-Eileanan an Iar council.

The Point of Origin (0,0) is 919.60 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for NB1812

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Map Series	link	Ordnance Survey
Explorer 1:25,000 456 North Harris and Loch Seaforth/Ceann a Tuath Na Hearadh Agus Loch Shiphoirt
Landranger 1:50,000 13 West Lewis & North Harris	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 14 Tarbert & Loch Seaforth	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 NB1812 and the vertical and horizontal line divides the square into four quadrants

Dividing the NB1812 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. NB , 18 and 12

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 NB + 18 + 3 + 12 + 5 would give you the six figure grid reference of NB183125

NB	18		12
NB	18	3	12	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	58.007337	-6.776972	118000	912000
South East Corner	58.007337	-6.758914	119000	912000
North West Corner	58.016921	-6.776972	118000	913000
North East Corner	58.016921	-6.758914	119000	913000