A patrol boat is a relatively small naval vessel generally designed for coastal defence, border security, or law enforcement. There are many designs for patrol boats, and they generally range in size. They may be operated by a nation's navy, coast guard, police, or customs, and may be intended for marine, estuarine, or river environments.
The River class is a class of offshore patrol vessels built primarily for the Royal Navy of the United Kingdom. A total of nine were built for the Royal Navy (RN), four Batch 1 and five Batch 2. One Batch 1 (HMS Clyde), which was the Falklands guard ship, was decommissioned and transferred at the end of its lease to the Royal Bahrain Naval Force.
A stealth ship is a ship that employs stealth technology construction techniques in an effort to make it harder to detect by one or more of radar, visual, sonar, and infrared methods.
The OTO Melara 76 mm gun, marketed as the OTO 76/62 Gun Mount, is a naval autocannon built and designed by the Italian defence company OTO Melara. It is based on the OTO Melara 76/62C and evolved toward 76/62 SR and 76/62 Strales.
The Royal Australian Navy, although a significant force in the Asia-Pacific region, is nonetheless classed as a medium-sized navy. Its fleet is based around two main types of surface combatant, with limited global deployment and air power capability. However, in 2009, a white paper, Defending Australia in the Asia Pacific Century: Force 2030, was produced by the Australian government which set out a programme of defence spending that will see significant improvements to the RAN's fleet and capabilities.
The Gowind design is a family of steel monohull frigates, corvettes and offshore patrol vessels developed since 2006 by France's Naval Group, formerly known as DCNS, to conduct missions in the littoral zone such as anti-submarine warfare (ASW). The Gowind family includes vessels with lengths from 85 to 111 metres and displacement from 1,000 tons to 3,100 tons.
The Jacinto-class patrol vessels currently in service with the Philippine Navy are three ships formerly belonging to the Royal Navy's Hong Kong Squadron as Peacock-class corvettes until 1997. The ships have undergone combat, electronics, weapon, propulsion and hull upgrades, with the most recent upgrade completed in August 2019. These increased their capabilities compared to the original Peacock-class vessels.
The Arafura class is a class of offshore patrol vessels being built for the Royal Australian Navy (RAN). Initially proposed in the 2009 Defence White Paper and marked as procurement project SEA 1180, it was originally planned that 20 Offshore Combatant Vessels (OCV) would replace 26 vessels across four separate ship classes: the Armidale-class patrol boats, the Huon-class minehunters, the Leeuwin-class survey vessels, and the Paluma-class survey motor launches. Although having a common design, the ships would use a modular mission payload system to fulfill specific roles; primarily border patrol, mine warfare, and hydrographic survey. The 2013 Defence White Paper committed to the OCV project as a long-term goal, but opted in the short term for an accelerated procurement of an existing design to replace the Armidales, and life-extension refits for the other types. This resulted in the Offshore Patrol Vessel (OPV) project and the number of vessels reduced to 12. However, this was further increased to 14 when 2 further Mine Counter Measures variants were proposed under SEA 1905.
The Del Pilar-class are offshore patrol vessels currently in service with the Philippine Navy and previously in service with the US Coast Guard as Hamilton-class high endurance cutters. The Department of National Defense is currently in the process of upgrading their systems and capabilities under a modernization project awarded to Hanwha Systems of South Korea.
The Armed Forces of the Philippines (AFP) Modernization Act, officially designated as Republic Act No. 7898, was a Philippine law that was enacted on February 23, 1995, by President Fidel V. Ramos. It was aimed to modernize all branches of the Armed Forces of the Philippines (AFP) such as the Philippine Air Force, Philippine Navy, and the Philippine Army. The law was amended by Republic Act No. 10349, also known as the Revised AFP Modernization Act, on December 11, 2012.
The Jose Rizal-class of multi-role guided missile frigates, currently in service with the Philippine Navy, are a heavily modified variant of the ROK Navy's Incheon-class frigates. The ships, which were built by Hyundai Heavy Industries (HHI), are specifically accommodated to fit the requirements of the Philippine Navy. The frigates will improve the ability of the Philippine Navy's Offshore Combat Force, which is mostly composed of ships that were retired from other countries and subsequently transferred to the Philippines.
The KSS-III, often called Dosan Ahn Changho-class is a series of diesel-electric attack submarines currently being built for the Republic of Korea Navy (ROKN), jointly by Hanwha Ocean and HD Hyundai Heavy Industries (HHI). The KSS-III is the final phase of the Korean Attack Submarine program, a three-phased program to build 27 attack submarines for the ROKN, between 1994–2029.
BRP Jose Rizal (FF-150) is the lead ship of her class of guided missile frigates of the Philippine Navy. She is the first purpose-built frigate of the service, as its previous major warships were mostly obtained from retired patrol ships of other countries. She is also one of the navy's primary warships able to conduct multi-role operations, such as coastal patrol, anti-air and anti-submarine warfare.
BRP Antonio Luna (FF-151) is the second ship of the Jose Rizal-class of guided missile frigates in service with the Philippine Navy. She is able to conduct multi-role operations such anti-surface warfare (ASUW), anti-submarine warfare (ASW), and limited anti-air warfare (AAW). She is one of the service's primary warships until the introduction of new and more powerful contemporaries.
The defense industry of South Korea is the main supplier of armaments to the Republic of Korea's Armed Forces. Originally reliant on the United States to supply weapons to its armed forces, South Korea started to manufacture its own weapons through the country's modernization and military reforms. Today, South Korea enjoys a robust defense industry and is the world's 8th largest weapons exporter.
The HDC-3100 Future Corvette is a class of corvettes being designed and built by Hyundai Heavy Industries (HHI) for the Philippine Navy.
The Wonhae class are a series of six offshore patrol vessels being built for the Philippine Navy by Hyundai Heavy Industries (HHI) at its Ulsan shipyard in South Korea. The last will be completed in 2028.
The Next-Generation Offshore Patrol Vessel (OPV) program consists of a planned 12 OPV-type patrol vessels to be operated by the Japan Maritime Self-Defense Force (JMSDF).
Philippine Navy 
