High Quality Content by WIKIPEDIA articles! The Skjold class patrol boats (skjold means "shield" in Norwegian) is a new class of superfast, large stealth missile craft, formerly known as MTBs (missile torpedo boats). From 2009, the Royal Norwegian Navy officially label them as coastal corvettes (kystkorvett) because their seaworthiness is seen as comparable to corvettes. They are built at the Umoe Mandal yard, and regarded as the fastest warships in the world with speeds over 60 knots / 110 km/h.