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The Irish national grid reference system is a system of geographic grid references commonly used in Ireland. The Irish grid overlaps the British grid. The British national grid reference system is a system of geographic grid references commonly used in Great Britain, different from using latitude or longitude. ...
Usage
In general, neither Ireland nor Great Britain uses latitude or longitude in describing internal geographic locations. Instead grid reference systems are in common usage. Latitude, sometimes denoted by the Greek letter φ, gives the location of a place on Earth north or south of the Equator. ...
Map of Earth showing lines of longitude, which appear curved and vertical in this projection, but are actually halves of great circles Longitude, sometimes denoted by the Greek letter λ, describes the location of a place on Earth east or west of a north-south line called the Prime Meridian. ...
A grid reference is a standard method for the location of a point on a map. ...
The national grid referencing system was devised by the Ordnance Survey, and is heavily used in their survey data, and in maps (whether published by the Ordnance Survey of Ireland, the Ordnance Survey of Northern Ireland or commercial map producers) based on those surveys. Additionally grid references are commonly quoted in other publications and data sources, such as guide books or government planning documents. Image produced from the Ordnance Survey Get-a-map service. ...
Ordnance Survey Ireland (OSI; Irish: Suirbhéireacht Ordanáis na hÉireann) is the mapping agency in the Republic of Ireland. ...
Ordnance Survey of Northern Ireland is the mapping agency in Northern Ireland, part of the United Kingdom. ...
Note that a new co-ordinate system is planned for Ireland[1]. Image File history File links OS_grid_key_Ireland. ...
Grid Letters The area of Ireland is divided into 20 squares, measuring 100km by 100km, each identified by a letter.
Eastings and Northings Within each square, eastings and northings from the origin (south west corner) of the square are given numerically. For example, G0305 means 'square G, 3 km east, 5 km north'. A location can be indicated to varying resolutions numerically, usually from two digits in each coordinate (for a 1 km square) through to five (for a 1 m square); the most common usage is the six figure grid reference, employing three digits in each coordinate to determine a 100 m square.
Examples - O 008 741 (Newgrange Neolithic Tomb, Co Meath on OSNI 1:250000 mapping from OrdnanceSurvey.co.uk Get-a-Map).
- C 948 454 (Giant's Causeway, Co Antrim on OSNI 1:250000 mapping ibid).
Newgrange, Ireland Entrance slab with megalithic art Newgrange, one of the passage tombs of the Brú na Bóinne complex in County Meath, is the most famous of all Irish prehistoric sites. ...
Basalt columns Giants Causeway A plane of columns The Giants Boot The Giants Causeway is an area of 40,000 tightly packed basalt columns resulting from a volcanic eruption 60 million years ago. ...
External links - A detailed (42 page) PDF file including history and map of the Irish part and its links to Britain
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