The SH5637 Square Kilometre

SH5637 National Grid Square

Based in the Mid and West Wales region of Scotland.

The SH5637 square kilometre intersects with the settlements of Borth-y-Gest & Porthmadog.

SH5637 is within the post town of Porthmadog, Caernarfonshire.

The square is within Gwynedd - Gwynedd council.

The Point of Origin (0,0) is 423.21 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for SH5637

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Map Series	link	Ordnance Survey
Explorer 1:25,000 254 Lleyn Peninsula East	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Explorer 1:25,000 ol18 Harlech, Porthmadog & Bala	Shop for this map on amazon.co.uk
Landranger 1:50,000 124 Dolgellau	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 SH5637 and the vertical and horizontal line divides the square into four quadrants

Dividing the SH5637 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 , 56 and 37

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 + 56 + 3 + 37 + 5 would give you the six figure grid reference of SH563375

SH	56		37
SH	56	3	37	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	52.911089	-4.143291	256000	337000
South East Corner	52.911089	-4.127988	257000	337000
North West Corner	52.920339	-4.143291	256000	338000
North East Corner	52.920339	-4.127988	257000	338000