The TF9900 Square Kilometre

TF9900 National Grid Square

Based in the Eastern English Region.

TF9900 is within the post towns of Attleborough, Norfolk & Norwich, Norfolk.

The square is within Breckland District council.

The Point of Origin (0,0) is 669.93 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for TF9900

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Map Series	link	Ordnance Survey
Explorer 1:25,000 237 Norwich	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 144 Thetford & Breckland	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 TF9900 and the vertical and horizontal line divides the square into four quadrants

Dividing the TF9900 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. TF , 99 and 00

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 TF + 99 + 3 + 00 + 5 would give you the six figure grid reference of TF993005

TF	99		00
TF	99	3	00	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	52.561084	0.934443	599000	300000
South East Corner	52.561084	0.949777	600000	300000
North West Corner	52.570429	0.934443	599000	301000
North East Corner	52.570429	0.949777	600000	301000