Per their name, patrol boats are primarily used to patrol a country's exclusive economic zone (EEZ), but they may also be used in other roles, such as anti-smuggling, anti-piracy, fishery patrols, immigration law enforcement, or search and rescue. Depending on the size, organization, and capabilities of a nation's armed forces, the importance of patrol boats may range from minor support vessels that are part of a coast guard, to flagships that make up a majority of a navy's fleet. Their small size and relatively low cost make them one of the most common naval vessels in the world.
The classification of a patrol boat is often subjective, but they are generally small naval vessels that are used to patrol national waters or a certain jurisdiction. They may be as large as a frigate or a corvette, though the term may also be used for vessels as small as a yacht or rigid inflatable boat. They can include fast attack craft, torpedo boats, and missile boats. They may be broadly classified as inshore patrol vessels (IPVs) or offshore patrol vessels (OPVs). OPVs and medium size cutters are usually the smallest ship in a navy's fleet that are large and seaworthy enough to patrol off-shore in the open ocean, while IPVs are typically too small to do so and are instead kept in lakes or rivers, or close to coasts; IPVs specifically used in rivers can also be called "riverine patrol vessels". Large patrol vessels, Heavy patrol vessels and Large cutters are the largest type of the patrol ships are typically more than 100 m (330 ft) in length.
During both World Wars, in order to rapidly build up numbers, all sides created auxiliary patrol boats by arming motorboats and seagoing fishing trawlers with machine guns and obsolete naval weapons. Some modern patrol vessels are still based on fishing and leisure boats.
The United States Navy operated the Pegasus class of armed hydrofoils for years in a patrol boat role. During the Vietnam War, the U.S. Navy ordered 193 aluminum hulled Patrol Craft, Fast (PCFs),[2] also known as Swiftboats, for brown water naval operations. The Patrol Boat, River (PBR, sometimes called "Riverine" and "Pibber") was a fiberglass hulled vessel also designed and used for inland river operations during the Vietnam War, and became an icon of water operations during the war due to its use in the 1979 film Apocalypse Now.
Most modern designs are powered by gas turbine arrangements such as CODAG, and speeds are generally in the 25–30 knots (46–56 km/h; 29–35 mph) range. The largest OPVs might also have a flight deck and helicopter embarked. In times of crisis or war, these vessels are expected to support the larger vessels in a navy, though some smaller navies are mostly composed of just patrol boats.
35m Fast Patrol Vessels- USA -built by Swiftships, Commissioned in 2021 [3]
Bangladesh
The Bangladesh Navy classified its medium size patrol ships as large patrol craft (LPC) which are armed with either anti-ship missiles or torpedoes. Those ships typically have heavier armaments but less range than OPVs.[4][5]
Harbour security boat (PBI) – four newly built 80-ton class harbour security / patrol boats, and more are planned in order to take over the port security / patrol duties currently performed by the obsolete Shantou, Beihai, Huangpu, and Yulin-class gunboats, which are increasingly being converted to inshore surveying boats and range support boats
Cyclone-class patrol ship - (2000–2011) - four boats were transferred to the Coast Guard for a temporary loan, three (2004–2011) have since been returned, while the fourth (2000–2004) was donated to the Philippine Navy
^"Brazil getting armored vehicles, boats". Space War. Space Media Network. UPI. 10 August 2012. Retrieved 19 August 2017. The first-of-class Amazonas was constructed at BAE Systems' Portsmouth facility.
^"Offshore Patrol Vessels". BAE Systems. n.d. Archived from the original on 17 January 2013. We are supplying three Ocean Patrol Vessels and ancillary support services to the Brazilian Navy, as well as a manufacturing licence to enable further vessels of the same class to be constructed in Brazil. P120 Amazonas, P121 Apa and P122 Araguari
^E.A. Pagotsis (2009). G. Christogiannakis (ed.). Hellenic Defence Report 2009-2010 (Yearbook of the magazine Hellenic Defence & Security). Athens: Line Defence Publications Ltd. p. 81.
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