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The ST0406 Square Kilometre

ST0406 National Grid Square

Based in the South West English Region.

ST0406 is within the post town of Cullompton, Devon.

The square is within Mid Devon District council.

The Point of Origin (0,0) is 321.95 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for ST0406

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Map SerieslinkOrdnance Survey
Explorer 1:25,000 115 Exmouth and SidmouthShop for this map on amazon.co.ukBuy Direct from the Ordnance Survey
Explorer 1:25,000 128 Taunton and Blackdown HillsShop for this map on amazon.co.ukBuy Direct from the Ordnance Survey
Landranger 1:50,000 192 Exeter & SidmouthShop for this map on amazon.co.ukBuy Direct from the Ordnance Survey
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Key of Northings for the ST0406 National Grid Square
Map of the ST0406 National Grid Square
Key of Eastings for the ST0406 National Grid Square
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A historical Ordnance Survey Map Sheet showing Grid Square ST0406.

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 ST0406 and the vertical and horizontal line divides the square into four quadrants

Dividing the ST0406 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. ST , 04 and 06

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 ST + 04 + 3 + 06 + 5 would give you the six figure grid reference of ST043065

ST0406
ST043065

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!


CornerLatitudeLongitudeEastingNorthing
South West Corner50.845522-3.365222304000106000
South East Corner50.845522-3.350759305000106000
North West Corner50.854677-3.365222304000107000
North East Corner50.854677-3.350759305000107000