The Info List - Irish Grid Reference System

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The IRISH GRID REFERENCE SYSTEM is a system of geographic grid references commonly used in Ireland
(both Northern Ireland
and the Republic of Ireland
). The Irish grid lies within the British grid , but uses a different co-ordinate system with a meridian more suited to the westerly location.


* 1 Usage * 2 Grid letters * 3 Eastings and northings * 4 Summary parameters of the Irish Grid coordinate system * 5 Notes * 6 References * 7 External links


In general, neither Ireland
nor Great Britain
Great Britain
uses latitude or longitude in describing internal geographic locations. Instead grid reference systems are in common usage.

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
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.

The Ordnance Survey