Coast Guard
Background
In 1809, the Water Guard was formed. It was the maritime arm of Revenue Enforcement which patrolled the shore. It was initially based in watch houses around the coast. Boat crews patrolled the coastal waters. It was amalgamated with Customs in 1822.
The Coast Guard was established by the Board of Customs in 1822 and was later absorbed into the Customs and Excise Department in 1909. Control of the Coast Guard passed to the Royal Navy in 1856.
In the  UK, the Coast Guard was places under the control of the Board of Trade specifically dedicated to marine safety and lifesaving in 1923. The Coast Guard Act, 1925 defined its powers and responsibility. The legislation applied to dominions.
After 1922, in Ireland, the service continued as the Coast Life Saving Service.  It was renamed as the Coast and Cliff Rescue Service. In 1991, it became the Irish Marine Emergency Service known as IMES. In 2000, it became the Irish Coast Guard.
Irish Coast Guard
The Irish Coast Guard is a nationwide emergency organisation. It is a division of the Department of Transport, Tourism and Sports. Its function is to establish, promote and enforce safety and security standards and prevent loss of life at sea and inland waterways, mountains and caves. It provides an emergency response service.  It also seeks to safeguard the quality of the marine environment.
The Irish Coast Guard is responsible for the national system of marine emergency management in Ireland’s exclusive economic zone and inland waterways. It is responsible for the coordination of response to maritime accidents that require search and rescue and counter pollution and salvage operations. It is responsible for monitoring the vessel traffic.
Coast Guard Function
It is required to operate to be and effective search and rescue service. The increase in international obligations including the United Nations Convention and the Law of the Sea, International Convention and Safety of Life at Sea, 1974 Salvage and Wreck Act has broadened its responsibilities.
The main function of the Irish Coast Guard is to rescue persons at sea and nearby land. It organises immediate medical transport.  Access ports and ships in the jurisdiction.
It responds annually to thousands of incidents sea and cliffs, beaches in Ireland through its marine rescue centres based in Dublin, Malin Head and Valentia Island. Each is responsible for search and rescue operations.
Other Bodies
Operations in respect to maritime security, illegal drug trafficking, migration, and fisheries enforcement are coordinated by other bodies within the state.
The Dublin Centre provides research and rescue response services and coordinates response to marine casualties under pollution legislation. Search and rescue operations are supported by decision support systems which provide incident management and recording.