![]() These squares are outlined in light grey on the "100km squares" map, with those containing land lettered. 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. 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. Distance measure for dog-leg routes & area calculations.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. ![]() LatLong WSG84 GB, Ireland (inc NI) and Chanel Islands (30U) GR formats recognised. LatLong OSi Grid Ref converts & presents in many formats, generates specific links to that location for several useful map web pages - 1840 - present.Clickable webmap that shows Irish grid references.History and overview of the system, from OSI.A two-page article for the American Society for Photogrammetry and Remote Sensing summarising the above.A detailed (42-page) PDF file including history and map of the Irish grid and its links to Britain.PDF (221KB) detailing GPS to Irish Grid conversions.The Irish Grid - A Description of the Co-ordinate Reference System used in Ireland PDF (358kB) on the Irish Grid from OSi.Ordnance Survey Ireland : 185 years of innovation in mapping. Summary parameters of the Irish Grid coordinate system Spheroid: Airy Modified, Datum: 1965, Map projection: Transverse Mercator Latitude of Origin: 53☃0'00 N Longitude of Origin: 8☀0'00 W Scale Factor: 1.000 035 False Easting: 200000 m False Northing: 250000 m Notes Coordinates in this format must never be truncated, because, for example, 31590, 23467 is also a valid location. For example, the location of the Spire of Dublin on O'Connell Street may be given as 315904, 234671 as well as O1590434671. A location can be indicated to varying resolutions numerically, usually from two digits in each coordinate (for a 1 km (0.62 mi) square) through to five (for a 1 m (3 ft 3 in)) square the most common usage is the six figure grid reference, employing three digits in each coordinate to determine a 100 m (330 ft) square.Ĭoordinates may also be given relative to the origin of the entire 500 by 500 km (310 by 310 mi) grid (in the format easting, northing). ![]() Within each square, eastings and northings from the origin (south west corner) of the square are given numerically. Seven of the squares do not actually cover any land in Ireland: A, E, K, P, U, Y and Z. The squares are numbered A to Z with I being omitted. The area of Ireland is divided into 25 squares, measuring 100 by 100 km (62 by 62 mi), each identified by a single letter. ![]()
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