Next-Generation Offshore Patrol Vessel program

Japanese warship building program

Not to be confused with Next-Generation Offshore Patrol Vessel, a similar ship class planned to be constructed for the Indian Navy.

This article's lead section may be too short to adequately summarize the key points. Please consider expanding the lead to provide an accessible overview of all important aspects of the article. (April 2025)

|

Official artist conception

Class overview
Builders| Japan Marine United (JMU), Mitsubishi Heavy Industries (MHI)
Operators|  Japan Maritime Self-Defense Force
Built| February 2025-present[1]
In commission| March 2027 (scheduled)[1]
Planned| 12
Building| 4
General characteristics
Type| Offshore patrol vessels (OPV)
Displacement| 1,920 long tons (1,950 t) standard
Length| 95 m (311 ft 8 in)
Beam| 12 m (39 ft 4 in)
Propulsion| Combined diesel-electric and diesel (CODLAD)
Speed| 20 kn (23 mph; 37 km/h)
Complement| 30
Armament| 1 × foredeck-mounted 30-mm naval gun for self-defense
Aircraft carried| Mitsubishi SH-60J/K/L or unmanned aerial vehicle (UAV)
Aviation facilities| Multi-purpose helicopter-UAV hangar and landing deck
Notes| Containerized mission modules, stern crane, launch and recovery system (LARS)

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).

## Background and operational concept

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See also: Territorial disputes of Japan

On 30 June 2022, the Japan Ministry of Defense (MOD) announced the construction of 12 offshore patrol vessels (OPV) for the Japanese Maritime Self-Defense Force (JMSDF) at a cost of ¥ 9 billion (US$66 million) per ship. Japan Marine United Corporation (JMU) is the prime contractor for this program with Mitsubishi Heavy Industries (MHI) chosen to be the subcontractor. Both JMU and MHI as well as Mitsui Engineering & Shipbuilding had submitted preliminary designs for the proposed next-generation OPVs.[2][3]

Exclusive economic zone of Japan. Disputed areas are marked in lighter color.

According to a video release in July 2021 by the Ministry of Defense's Acquisition, Technology & Logistics Agency (ATLA), the purpose of this OPV program is to provide enhanced maritime security, particularly around the southwestern Ryukyu Islands and the East China Sea, including the disputed territories over the Senkaku Islands (See map).[2][3]

The OPV will replace the Abukuma-class destroyer escorts and Hayabusa-class patrol boats currently deployed in patrol missions and as escorts for warships belonging to other navies in the Sea of Japan, East China Sea, and Pacific Ocean. The OPV will be equipped for intelligence, surveillance, and reconnaissance, since its armament is limited and will be primarily used in patrol sorties.[4][5][6]

Four ships were initially scheduled to be introduced by fiscal year 2024, followed by 12 within the next five years.[4] The first four OPVs are part of the 2023 Defense budget of the Japanese MOD.[5]

## Design

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These vessels are highly automated and configurable to meet a variety of missions to provide sustained intelligence, surveillance, and reconnaissance in maritime patrol surrounding Japan. Japan Marine United was contracted to build all 12 vessels for the JMSDF, starting from 1 April 2023. The vessels each displace 1,920 long tons (1,950 t) while measuring about 95 m (311 ft 8 in) in length and 12 m (39 ft 4 in) in width.[2][3] The OPV will be fitted with the UNIted COmbined Radio aNtenna (UNICORN) NORA-50 integration mast and Tactical Air Navigation System (TACAN), the former of which has tactical data antennas contained in its bar-shaped dome. ATLA stated that UNICORN, which the Mogami-class frigates under procurement at the time is also being equipped with, has a decreased radar cross section (RCS) due to its stealthy outline.[4]

## Equipment

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### Ship & power systems

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Each OPV features a CODLAD propulsion system, wherein a diesel engine and an electric motor power a single propeller, providing a maximum speed in excess of 20 kn (23 mph; 37 km/h). The conception artwork also depicts a bow thruster system.[2][3] Each OPV will be equipped with a 30-mm naval gun mounted on the foredeck for self-defense. The aft section of the vessel is equipped with a crane near the multi-purpose hangar and rear deck for helicopters or unmanned aerial vehicle (UAV) operations. The stern is also fitted with a launch and recovery system.[2][3]

### Mission modules

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The OPVs have ISO containerization capabilities for mission modules that can be installed on board.[2][3] Minesweeping-related equipment, such as the Autonomous Surface Vehicle (ASV) and Expendable Mine Disposal (EMD), were part of the preliminary design work by Mitsui Engineering & Shipbuilding and displayed at the 2019 MAST Asia defense trade-show, but no decision was made on the final mine counter-measures (MCM) suite.[4]

## Procurement

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According to its published budget overview, for Fiscal Year 2023, the Japanese Ministry of Defense allocated 35.7 billion yen ($230 million USD) for the first four ships in the next-generation OPV program.[7] The keels for the first four vessels were laid down at Japan Marine United's Yokohama shipyard, with the first two being scheduled to be launched in November 2025, while the other two will follow suit in March 2026. All four vessels are planned to be commissioned in March 2027.[1]

## Ships in the class

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Pennant No. | Name | Home port | Unit | Shipyard | Plan | Laid down | Launched | Commissioned | Status | Note

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TBD | Unit 1 | TBD | TBD | JMU | 2023 | 14 February 2025 | November 2025 (scheduled) | March 2027 (scheduled) | Under construction | [6][7][1]
TBD | Unit 2 | TBD | TBD | JMU | 2023 | 14 February 2025 | November 2025 (scheduled) | March 2027 (scheduled) | Under construction | [6][7][1]
TBD | Unit 3 | TBD | TBD | JMU | 2023 | 14 February 2025 | March 2026 (scheduled) | March 2027 (scheduled) | Under construction | [6][7][1]
TBD | Unit 4 | TBD | TBD | JMU | 2023 | 14 February 2025 | March 2026 (scheduled) | March 2027 (scheduled) | Under construction | [6][7][1]
TBD | Unit 5 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | Pending |
TBD | Unit 6 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | Pending |
TBD | Unit 7 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | Pending |
TBD | Unit 8 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | Pending |
TBD | Unit 9 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | Pending |
TBD | Unit 10 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | Pending |
TBD | Unit 11 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | Pending |
TBD | Unit 12 | TBD | TBD | TBD | TBD | TBD | TBD | TBD | Pending |

### Naming conventions

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The proposed JMSDF next-generation offshore patrol vessels (OPVs) have not been officially named. Ships of the JMSDF are known as Japan Ships (自衛艦; Ji'ei-Kan) and are classified according to the warship type. Patrol boats (PG) are named for birds, grass or one that added a number to the type.[original research?] In 2025, journalist Kosuke Takahashi confirmed that the next-generation offshore patrol vessels will have a new type designation OPV.[1]

## See also

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* Future Multi Purpose Trimaran concept

## References

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1. ^ a b c d e f g h Takahashi, Kosuke (13 April 2025). "海自が初導入する哨戒艦1～4番艦が起工 1、2番艦は早くも11月に進水へ 2027年3月には全艦就役" [Construction begins for the first four patrol ships of the MSDF, with the first and second ships to be launched as early as November and all ships to be commissioned by March 2027]. Yahoo! News Japan (in Japanese). Retrieved 24 April 2025.
2. ^ a b c d e f Kosuke Takahashi (2 July 2022). "Japan Awards Contract to Shipbuilder JMU for 12 New Offshore Patrol Vessels". The Diplomat. Retrieved 7 September 2022.
3. ^ a b c d e f Jr Ng (14 July 2022). "Japan Marine United selected to build JMSDF's next-gen OPV". Asia Military Review. Retrieved 7 September 2022.
4. ^ a b c d Yoshihiro Inaba (17 July 2021). "Video: Japan's Latest And Future Naval Defense Equipment". Naval News. Retrieved 7 October 2022.
5. ^ a b Ridzwan Rahmat (8 September 2022). "Japan outlines funding proposal for new OPVs, anti-submarine helicopters in 2023". Janes.com. Retrieved 8 November 2022.
6. ^ a b c d e "Defense Programs and Budget of Japan FY Reiwa 5 (2023) Budget Overview" (PDF). Budget overview (in Japanese). Japanese Ministry of Defense. 23 December 2022. p. 24. Retrieved 9 January 2023.
7. ^ a b c d e "Fiscal Year 2023 Defense Programs and Budget of Japan" (PDF). USNI News Blog. United States Naval Institute. 30 March 2023. p. 24. Retrieved 31 March 2023. "English language version; hereafter as MOD FY23 Budget Overview."

## Bibliography

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* "Budget for Fundamental Strengthening of Defense Capabilities FY Reiwa 5 (2023) Budget Overview" (PDF). Budget overview. Japanese Ministry of Defense. 23 December 2022. Retrieved 9 January 2023. "in Japanese (防衛力整備計画)."
* "Defense Programs and Budget of Japan FY Reiwa 5 (2023) Budget Overview" (PDF). Budget overview. Japanese Ministry of Defense. 23 December 2022. Retrieved 9 January 2023. "In Japanese (防衛力抜本的強化「元年」予算)."

## External links

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* Japan Marine United To Build JMSDF's Next Generation Offshore Patrol Vessels (OPV) \- Update Defense - July 1, 2022
* Japan Maritime United (JMU) to Build The Next Generations of Japanese Offshore Patrol Vessels (OPV) \- TheAsianChannel - July 2, 2022
* Japan Marine United to Build JMSDF's Next Generation OPV \- Gono Vsion Plus - July 14, 2022
* Japan Build The Next-Generation Offshore Patrol Vessels for JMSDF \- Public Defense - July 16, 2022

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Combatant ship classes of the Japan Maritime Self-Defense Force

Helicopter Destroyer (DDH)|

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* List of combatant ship classes of the Japan Maritime Self-Defense Force
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