Overview

A coast guard is a maritime service charged with protecting people, property and the environment at and near sea. Many nations maintain an agency for coastal safety and enforcement; its exact powers, size and legal status differ widely. Some countries maintain a uniformed, armed branch with military status, while others operate civilian rescue services. A general introduction to these agencies can be found at coast guard organisations.

Primary roles and typical duties

Common tasks performed by coast guards include search and rescue (SAR), maritime law enforcement, pollution response, safety inspections and the maintenance of navigational aids. Many services also help with fisheries protection, counter-smuggling and anti-terrorism measures at sea. Where law enforcement powers exist, they allow boarding, inspection and arrest to enforce maritime rules; see descriptions of their military or policing character at military or semi-military status. Coast guards are institutionally distinct from a nation's navy (navy) even when they cooperate closely.

Assets and organisation

Typical coast guard equipment ranges from small rescue boats and rigid-hulled inflatable craft to larger offshore patrol vessels, cutters and helicopters. Aircraft and unmanned systems are increasingly used for surveillance. Small vessels and large ships are both central to operations: the terms ships and boats describe those different classes. Personnel may be military-trained, police officers, civilian specialists or volunteers depending on national arrangements.

History and national examples

The modern concept of a coast guard developed from older revenue, customs and lifesaving services in the 19th and early 20th centuries. A prominent example is the United States Coast Guard (USCG), which is a branch of the U.S. armed forces and carries out SAR, law enforcement and maritime security duties; more on that service is available at US Coast Guard. In the United Kingdom the civilian Her Majesty’s Coastguard leads SAR coordination while independent volunteer lifeboat crews provide most rescue launches — the volunteer charity model is represented by the Royal National Lifeboat Institution.

Differences between coast guards and navies are important: navies focus on national defence and power projection, whereas coast guards concentrate on safety, regulation and law enforcement in peacetime. Coast guards often operate within vessels’ territorial waters and the exclusive economic zone to uphold maritime law and counter illicit activity, including preventing crimes at sea (crimes) or responding to threats such as maritime terrorism (terrorism).

Cooperation and international frameworks

Coast guards commonly work with other national agencies, port authorities, volunteer organisations and international partners to coordinate SAR regions and pollution response. International agreements and conventions provide a framework for cooperative search-and-rescue and pollution control, and joint exercises help improve readiness. For further operational or organisational resources consult coast guard organisations and materials on military or semi-military status.

  • Typical missions: search and rescue, law enforcement, environmental protection.
  • Typical assets: cutters, patrol boats, helicopters, fixed-wing aircraft.
  • Common partners: navies, police, volunteer lifeboat services and port authorities.