The SH7803 Square Kilometre

SH7803 National Grid Square

Based in the Mid and West Wales region of Scotland.

The SH7803 square kilometre intersects with the settlement of Llanwrin.

SH7803 is within the post town of Machynlleth, Montgomeryshire.

The square is within Powys - Powys council.

The Point of Origin (0,0) is 411.21 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for SH7803

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Map Series	link	Ordnance Survey
Explorer 1:25,000 ol23 Cadair Idris & Llyn Tegid	Shop for this map on amazon.co.uk
Explorer 1:25,000 215 Newtown, Llanfair Caereinion
Landranger 1:50,000 135 Aberystwyth	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 SH7803 and the vertical and horizontal line divides the square into four quadrants

Dividing the SH7803 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. SH , 78 and 03

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 SH + 78 + 3 + 03 + 5 would give you the six figure grid reference of SH783035

SH	78		03
SH	78	3	03	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	52.611047	-3.803587	278000	303000
South East Corner	52.611047	-3.788456	279000	303000
North West Corner	52.620256	-3.803587	278000	304000
North East Corner	52.620256	-3.788456	279000	304000