The TG4021 Square Kilometre

TG4021 National Grid Square

Based in the Eastern English Region.

TG4021 is within the post towns of Great Yarmouth, Norfolk & Norwich, Norfolk.

The square is within North Norfolk District council.

The Point of Origin (0,0) is 715.99 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for TG4021

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Map Series	link	Ordnance Survey
Explorer 1:25,000 252 Norfolk Coast East	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Explorer 1:25,000 ol40 The Broads	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 133 North East Norfolk	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 134 Norwich & The Broads	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey

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 TG4021 and the vertical and horizontal line divides the square into four quadrants

Dividing the TG4021 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. TG , 40 and 21

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 TG + 40 + 3 + 21 + 5 would give you the six figure grid reference of TG403215

TG	40		21
TG	40	3	21	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	52.732915	1.553423	640000	321000
South East Corner	52.732915	1.568937	641000	321000
North West Corner	52.742332	1.553423	640000	322000
North East Corner	52.742332	1.568937	641000	322000