The SH6545 Square Kilometre

SH6545 National Grid Square

Based in the Mid and West Wales region of Scotland.

SH6545 is within the post town of Penrhyndeudraeth, Merioneth.

The square is within Gwynedd - Gwynedd council.

The Point of Origin (0,0) is 435.03 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for SH6545

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Map Series	link	Ordnance Survey
Explorer 1:25,000 ol17 Snowdon & Conwy Valley	Shop for this map on amazon.co.uk
Explorer 1:25,000 ol18 Harlech, Porthmadog & Bala	Shop for this map on amazon.co.uk
Landranger 1:50,000 115 Snowdon	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 SH6545 and the vertical and horizontal line divides the square into four quadrants

Dividing the SH6545 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 , 65 and 45

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 + 65 + 3 + 45 + 5 would give you the six figure grid reference of SH653455

SH	65		45
SH	65	3	45	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	52.985297	-4.012854	265000	345000
South East Corner	52.985297	-3.997551	266000	345000
North West Corner	52.994532	-4.012854	265000	346000
North East Corner	52.994532	-3.997551	266000	346000