The SN7992 Square Kilometre

SN7992 National Grid Square

Based in the Mid and West Wales region of Scotland.

SN7992 is within the post town of Machynlleth, Montgomeryshire.

The square is within Powys - Powys council.

The Point of Origin (0,0) is 403.86 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for SN7992

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Map Series	link	Ordnance Survey
Explorer 1:25,000 215 Newtown, Llanfair Caereinion
Landranger 1:50,000 135 Aberystwyth	Shop for this map on amazon.co.uk
Landranger 1:50,000 136 Newtown & Llanidloes	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 SN7992 and the vertical and horizontal line divides the square into four quadrants

Dividing the SN7992 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. SN , 79 and 92

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 SN + 79 + 3 + 92 + 5 would give you the six figure grid reference of SN793925

SN	79		92
SN	79	3	92	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	52.512431	-3.784804	279000	292000
South East Corner	52.512431	-3.769712	280000	292000
North West Corner	52.521638	-3.784804	279000	293000
North East Corner	52.521638	-3.769712	280000	293000