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Also known as lightship, light vessel

thumb|right|Lightship Finngrundet (1903)|Lightship Finngrundet, now a [[museum ship in Stockholm. The day markers can be seen on the masts.]] thumb|right|Fehmarnbelt Lightship|Fehmarnbelt Lightship, now a [[museum ship in Lübeck]] thumb|Bürgermeister O´Swald II was the world's largest manned lightship, the last lightship at position Elbe 1. In the picture on a visit to [[Ystad 12 July 2017.]] A lightvessel, or lightship, is a ship that acts as a lighthouse in areas deemed unsuitable for proper lighthouse construction. Although some records exist of fire beacons being placed on ships in Roman