United States Coast Guard

(PD) Photo: Michael Anderson / USCG
Island class Cutter Chandeleur.

With a substantial claim to being the oldest of the United States' uniformed services, the United States Coast Guard has an exceptionally wide range of civilian missions, with additional wartime responsibilities. At present, it is under the Department of Homeland Security, but, for operations, can be under the United States Navy. It is the smallest armed service of the United States, although there are smaller uniformed services.

Its stated mission is to protect the public, the environment, and the United States economic and security interests in any maritime region in which those interests may be at risk, including international waters and America's coasts, ports, and inland waterways.

The Coast Guard's official motto is Semper Paratus, meaning "Always Ready". Its unofficial motto, from its Lifesaving Service ancestry, is "You have to go out. You don't have to come back.:

History

Coast Guard functions began with the Revenue Cutter Service, which was founded on August 4, 1790 as part of the Department of the Treasury. In 1915, the United States Coast Guard was formed from a merger of the Revenue Cutter Service and the Life-Saving Service. In 1939, it also assumed the responsibilities of the Lighthouse Service, and, in the Bureau of Marine Inspection and Navigation to the Coast Guard.

The legal basis for the Coast Guard is Title 14 of the United States Code, which states: "The Coast Guard as established January 28, 1915, shall be a military service and a branch of the armed forces of the United States at all times." The Treasury origin is reflected in the Coast Guard being the only U.S. uniformed service to have general law enforcement authority; it is not subject to the Posse Comitatus Act

Upon the declaration of war or when the President directs, the Coast Guard operates under the authority of the Department of the Navy. The Coast Guard later moved to the Department of Transportation in 1967, and on February 25, 2003 it became part of the Department of Homeland Security.

Missions

The Coast Guard has an exceptionally wide range of safety, law enforcement, and national security functions, which fall under the broad categories of:

• Search and Rescue
• Law Enforcement
• Marine Safety & Environmental Protection
• Polar, Alaska & Other Ice Operations (Including the International Ice Patrol)
• National Security, Military Preparedness

Search and Rescue

USCG is the lead U.S. agency participating in the Global Maritime Distress and Safety System (GMDSS) and the International Convention on Maritime Search and Rescue (SAR Convention). GMDSS was created by the Safety of Life at Sea convention, under the International Maritime Organization.

Coast Guard SAR communications have been based on a now-outmoded VHF communications ssytem called NDRS. This has no direction finding capabilities, gaps in geographic coverage, and was based on single channels that allowed neither broadcasts nor multiple simultaneous calls.

Rescue 21 encompasses a number of new technologies, many based on GPS. While there is a capability, in the new satellite-based Emergency position indicating radio beacon (EPIRB) program, to do direction-finding based on time-of-arrival of signals at multiple satellites, this is not needed if the beacon determines its own position with GPS, and includes that information in its signal.

Digital selective calling and other digital technologies increase system capacity which is being strained by increases in recreational boating and maritime trade. These increases involve the somewhat different requirements of inland, coastal, and deep-water navigation and communications.

Rescue 21 also addresses new homeland security requirements. Cargo ships greater than 300 tons, and all passenger vessels, are required to install the automatic identification system (AIS), which is a continuously operating transponder system much as used in air traffic control. AIS, like another aviation system, also allows vessels to detect potential collisions without intervention by the control system.

A vessel that showed up on radar or other sensors, but was not sending verifiable AIS signals, would be immediate cause for investigation.