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Day shapes. Day shapes are mast head signals visually indicating the status of a vessel to other vessels on navigable waters during daylight hours whether making-way, anchored, or aground. These signals consist of a set of simple geometric shapes— ball, cylinder, cone, and diamond —that are displayed, hung from a mast, in a prescribed ...
Lightvessels in Ireland. For Lighthouses, see List of lighthouses in Ireland. Lightvessels in Ireland describes any lightvessel or light float previously stationed off the coast of Ireland. The Commissioners of Irish Lights are responsible for the majority of marine navigation aids around the whole of the island of Ireland.
A deck prism, or bullseye, is a prism inserted into the deck of a ship to provide light down below. [1][2][3] For centuries, sailing ships used deck prisms to provide a safe source of natural sunlight to illuminate areas below decks. Before electricity, light below a vessel's deck was provided by candles, oil and kerosene lamps —all dangerous ...
The '20 class' is a slightly larger type of vessel that derives its power from diesel electric generators. Where a main light with a visible range in excess of 20 nautical miles (37 km) is required, a '20 class' vessel is used, as the main light from a Trinity House solar lightvessel has a maximum range of 19 nautical miles (35 km).
Appearance. Light vessel 78 Calshot Spit on station in 1979. The history of the many lightvessel stations of Great Britain goes back over 250 years to the placement of the world's first lightship at the Nore in the early 18th century. A lightvessel station is a named position at which a lightvessel was placed, rather than a particular ship ...
NLV. Pole Star. NLV Pole Star is a lighthouse tender operated by the Northern Lighthouse Board (NLB), the body responsible for the operation of lighthouses and marine navigation aids around the coasts of Scotland and the Isle of Man. Pole Star was joined by a new vessel, NLV Pharos in March 2007, which replaced the previous vessel of the same ...
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