Holland-class offshore patrol vessel

The Holland-class offshore patrol vessels are a class of 4 offshore patrol vessels constructed for the Royal Netherlands Navy. They are designed to fulfill patrol and intervention tasks against lightly armed opponents, such as pirates and smugglers, but have much higher level electronic and radar surveillance capabilities which are used for military stabilization and security roles, short of outright war. Without sonar or long range weapons, they utilize the surveillance capabilities of the Thales integrated mast, which integrates communication systems and two 4-faced phased arrays for air and surface search.

History
A contract between the Royal Netherlands Navy and Damen Schelde Naval Shipbuilding in Vlissingen, the Netherlands was signed in 2007 for the construction of four vessels at a total cost of €467.8 million.

The vessels resulted from the Dutch Ministry of Defence's Marinestudie. The study proposes the sale of four existing s, and using the proceeds and savings of the sale to commission four dedicated patrol vessels, allow the building of a more capable Joint Support Ship to replace the auxiliary replenishment ship HNLMS Zuiderkruis (A832), and reintroducing a mine-sweeping capability to the Dutch Navy.

The vessels are designed for global use, in particular to be deployed to the Caribbean region, the South China Sea and the North Sea. They have the capability to carry out missions such as anti-piracy and blockade duties, and also can be used for emergency transport. They are constructed with heavier mild steel and armour, which results in a more robust ship of greater weight, than the previous M class frigates

Armament
The Holland class' main armament is a 76 mm Oto Melara Super Rapid gun with a firing rate of 120 rounds per minute and an maximum range of 16 km.

Secondary armament is provided by a 30 mm Oto Melara Marlin WS rapid cannon, two 12.7 mm Oto Melara Hitrole NT's and two 12.7 mm M2HB machine guns. All can be remotely operated.

Sensor suite
The ships are able to monitor to 250 km range air, missile and UAV targets and 70 km range surface targets using a Thales Integrated Sensor and Communication Systems (ISCS), comprising a SeaMaster 400 air warning radar, a Watcher 100 active phased-array surface detection and tracking radar, claimed to be able to detect small objects such as mines and periscopes on the sea surface at 40 km range, link 11 & 16 data links a mine detection sonar and an infra-red Gatekeeper/electro-optical (EO) warning system. The sensor systems are housed in an integrated mast, also provided by Thales, called the I-Mast 400. Thales also built the satellite communications system for the ships.

Propulsion
The Holland class is fitted with a combined electric or diesel (CODELOD) propulsion system. The gears manufactured by RENK combine one MAN 12V28/33D diesel rated at 5,460 kW and a 400 kW electric motor driving a controllable-pitch propeller on each of the two shafts. Electric motor is used mainly for low-speed operation.

Specifications
Holland-class ships have a tonnage of 3,750 tons, are 108.4 m in length, 16 m in beam and have a draft of 4.55 m. The ships have a speed of 21.5 kn and a range of 5000 nmi at 15 kn. The ship's complement is 52, as well as up to 39 people for duties such as helicopter or medical crew.

Other characteristics
The ships are built to a design that is intended to reduce the ability of radar to detect them, as well improving seakeeping by locating the superstructure unusually far aft. The ships are painted a new light blue-gray color, which supposedly has a better camouflage-effect than the standard light-grey paint used by other RNLN ships. The ships have a hangar and flightdeck for an NH-90 helicopter and also carry two Fast Raiding Interception Special forces Craft (FRISC), with a speed of more than 40 kn.

Beside these special forces crafts, the Holland class has an improved internal communication infrastructure and is more resistant to the use of resources that are characteristic for asymmetric warfare.

Ships in class
The projected number of ships for the class is four; they are planned to be commissioned between 2011 and 2013. On 20 December 2007 the contract was signed for four ships at a cost of around €467.8 million. The ships will be named after Dutch provinces of historical maritime importance.

Holland (P840)
Holland was laid down on 8 December 2008, launched on 2 February 2010 and commissioned on 12 May 2011. She was built at the Damen Schelde shipyard in Vlissingen. On 16 November 2011 she was the first ship in her class to receive the Thales Integrated Mast IM-400. The ship entered service during the 2012 Dutch navy days in Den Helder.

Zeeland (P841)
Zeeland was laid down on 5 October 2009 and launched on 20 November 2010. She began sea trials on 31 August 2011. She was built at the Damen Schelde shipyard in Vlissingen. Zeeland was delivered on 20 October 2011, and received her sensormast in December 2012. To enter service after final fitting out and finishing trials. Zeeland was commissioned on 23 August 2013 at Vlissingen.

Friesland (P842)
Friesland was laid down on 26 November 2009 and launched on 4 November 2010. She began sea trials on 27 September 2011, and she was delivered to the Defense Material Organisation (DMO) on 11 April 2012. She was built at the Damen Schelde shipyard in Galați. On 26 April 2012, she assisted in the rescue of a sail training vessel off Iona while participating in an international exercise.

Groningen (P843)
Groningen was laid down on 9 April 2010 and launched on 21 April 2011. She was built at the Damen Schelde shipyard in Galați.