Board Membership. Board Member. Ordnance Survey Ireland (OSI) is the national mapping agency of Ireland. OSI employs 320 staff located in Dublin�s Phoenix Park and in six regional offices in Cork, Ennis, Kilkenny, Longford, Sligo and Tuam.
OSI was initially part of the Irish army under the Department of Defence. All staff employed were military until the 1970s when the first civilian employees were then recruited. More recently, the Ordnance Survey of Ireland replaced traditional ground surveying with mapping based primarily on aerial photography. It has also worked with the national postal service (An Post), to gather and structure geographic data towards a national postcode system.