Editing Irish grid reference system (section)

==Usage==
In general, neither [[Ireland]] nor [[Great Britain]] uses [[latitude]] or [[longitude]] in describing internal geographic locations. Instead [[grid reference]] systems are used for mapping.

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.