The HY4901 Square Kilometre

HY4901 National Grid Square

Based in the Highlands and Islands region of Scotland.

HY4901 is within the post town of Orkney.

The square is within Orkney Islands council.

The Point of Origin (0,0) is 1,060.10 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for HY4901

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Map Series	link	Ordnance Survey
Explorer 1:25,000 461 Orkney - East Mainland		Buy Direct from the Ordnance Survey
Landranger 1:50,000 6 Orkney - Mainland	Shop for this map on amazon.co.uk
Landranger 1:50,000 7 Orkney - Southern Isles	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 HY4901 and the vertical and horizontal line divides the square into four quadrants

Dividing the HY4901 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. HY , 49 and 01

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 HY + 49 + 3 + 01 + 5 would give you the six figure grid reference of HY493015

HY	49		01
HY	49	3	01	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	58.893284	-2.886911	349000	1001000
South East Corner	58.893284	-2.869332	350000	1001000
North West Corner	58.902382	-2.886911	349000	1002000
North East Corner	58.902382	-2.869332	350000	1002000