įor the second letter, each 500 km square is subdivided into 25 squares of size 100 km by 100 km, each with a letter code from A to Z (again omitting I) starting with A in the north-west corner to Z in the south-east corner. The O square contains a tiny area of North Yorkshire, Beast Cliff at OV 0000, almost all of which lies below mean high tide. Four of these largest squares contain significant land area within Great Britain: S, T, N and H. The first letter of the British National Grid is derived from a larger set of 25 squares of size 500 km by 500 km, labelled A to Z, omitting one letter (I) (refer diagram below), previously used as a military grid. The map shows The Wash and the North Sea, as well as places within the counties of Lincolnshire, Cambridgeshire and Norfolk. Grid letters 100km squares Grid square TF. European-wide agencies also use UTM when mapping locations, or may use the Military Grid Reference System (MGRS), or variants of it. The Universal Transverse Mercator coordinate system (UTM) is used to provide grid references for worldwide locations, and this is the system commonly used for the Channel Islands and Ireland ( since 2001). Grid references are also commonly quoted in other publications and data sources, such as guide books and government planning documents.Ī number of different systems exist that can provide grid references for locations within the British Isles: this article describes the system created solely for Great Britain and its outlying islands (including the Isle of Man) the Irish grid reference system was a similar system created by the Ordnance Survey of Ireland and the Ordnance Survey of Northern Ireland for the island of Ireland. ![]() The Ordnance Survey (OS) devised the national grid reference system, and it is heavily used in its survey data, and in maps based on those surveys, whether published by the Ordnance Survey or by commercial map producers. The Ordnance Survey National Grid reference system (OSGB) (also known as British National Grid ( BNG) ) is a system of geographic grid references used in Great Britain, distinct from latitude and longitude.
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