Per their name, patrol boats are primarily used to patrol a country'sexclusive economic zone (EEZ), but they may also be used in other roles, such as anti-smuggling, anti-piracy,fishery patrols,immigration law enforcement, orsearch 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.
There exist following sort of patrol boats:patrol boat fast (PBF),patrol boat with surface-to-surface missile (PBG),patrol boat inshore (PBI),patrol boat with SAM (PBM),patrol boat riverine (PBR),patrol boat with torpedo (PBT).[1]
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 certainjurisdiction. They may be as large as acorvette or even afrigate, though the term may also be used for vessels as small as ayacht orrigid inflatable boat. They can includefast attack craft,torpedo boats, andmissile 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 openocean, while IPVs are typically too small to do so and are instead kept inlakes orrivers, or close tocoasts; 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 patrol ships and are typically more than 100 m (330 ft) in length.
Seagoing patrol boats are typically around 30 m (100 ft) in length and usually carry a single medium caliberartillery gun as main armament, and a variety of lighter secondary armament such asmachine guns, while others include the sophisticatedclose-in weapon system. Depending on their role, vessels in this class may also have more sophisticated sensors andfire control systems that would enable them to carrytorpedoes,anti-ship missiles, andsurface-to-air missiles.[2]
During both World Wars, in order to rapidly build up numbers, all sides created auxiliary patrol boats by armingmotorboats and seagoingfishing trawlers with machine guns and obsolete naval weapons. Some modern patrol vessels are still based on fishing and leisure boats.
TheUnited States Navy operated thePegasus class of armed hydrofoils for years in a patrol boat role. During theVietnam War, the U.S. Navy ordered 193 aluminum hulledPatrol Craft, Fast (PCFs),[3] also known asSwiftboats, for brown water naval operations. ThePatrol 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 filmApocalypse Now.
Most modern designs are powered bygas turbine arrangements such asCODAG, and speeds are generally in the 25–30 knots (46–56 km/h; 29–35 mph) range. The largest OPVs might also have aflight deck andhelicopter 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.
The Bangladesh Navy classified its medium size patrol ships aslarge patrol craft (LPC) which are armed with eitheranti-ship missiles ortorpedoes. Those ships typically have heavier armaments but less range than OPVs.[6][7]
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 obsoleteShantou, Beihai, Huangpu, and Yulin-classgunboats, 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 thefourth (2000–2004) was donated to thePhilippine Navy
^"Brazil getting armored vehicles, boats".Space War. Space Media Network. UPI. 10 August 2012. Retrieved19 August 2017.The first-of-class Amazonas was constructed at BAE Systems' Portsmouth facility.
^"Offshore Patrol Vessels". BAE Systems. n.d. Archived fromthe 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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