HNLMS Piet Hein (F811) was a Kortenaer-class frigate of the Royal Netherlands Navy, in service from 1981 to 1998. Named after the Dutch naval hero Piet Pieterszoon Hein, the vessel served as a significant component of the Dutch maritime defense during the late Cold War period. The ship was constructed at KM de Schelde in Vlissingen, with its keel laid on 28 April 1977 and launched on 3 June 1978. It was officially commissioned into service on 14 April 1981. The frigate's operational history includes notable diplomatic and naval missions. A prominent example occurred from 8 February 1982, when HNLMS Piet Hein, alongside other Dutch naval vessels—including the frigates Tromp, Callenburgh, Van Speijk, the destroyer Overijssel, and the replenishment ship Zuiderkruis—departed from Den Helder for a voyage to the United States. This deployment aimed to demonstrate naval presence and strengthen diplomatic ties, celebrating 200 years of Dutch-American relations. The fleet returned to Den Helder on 19 May 1982. In 1998, HNLMS Piet Hein was decommissioned and sold to the United Arab Emirates Navy. Renamed Al Emirat, the vessel was commissioned into the UAE fleet on 27 June 1998. It served with the UAE Navy until its decommissioning in 2008. Subsequently, the ship underwent a major transformation. Starting in 2009 at ADM Shipyards in Abu Dhabi, it was extensively rebuilt into a private superyacht named Yas. The conversion involved lengthening the vessel to 141 meters (463 feet), making it one of the largest motor yachts in the world. The yacht was relaunched in 2011 and delivered in 2015, highlighting its impressive maritime significance as a symbol of naval and private maritime engineering.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.