The TM3641 Square Kilometre

TM3641 National Grid Square

Based in the Eastern English Region.

TM3641 is within the post town of Woodbridge, Suffolk.

The square is within East Suffolk District council.

The Point of Origin (0,0) is 680.13 Kilometres away. This is where the National Grid starts around 80 kilometres west of the Isles of Scilly.

Ordnance Survey Maps for TM3641

If you purchase a map through the links below, we may earn an affiliate commission.

Map Series	link	Ordnance Survey
Explorer 1:25,000 197 Ipswich, Felixstowe and Harwich	Shop for this map on amazon.co.uk	Buy Direct from the Ordnance Survey
Landranger 1:50,000 169 Ipswich & The Naze	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 TM3641 and the vertical and horizontal line divides the square into four quadrants

Dividing the TM3641 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. TM , 36 and 41

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 TM + 36 + 3 + 41 + 5 would give you the six figure grid reference of TM363415

TM	36		41
TM	36	3	41	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	52.016788	1.438036	636000	241000
South East Corner	52.016788	1.453273	637000	241000
North West Corner	52.026189	1.438036	636000	242000
North East Corner	52.026189	1.453273	637000	242000