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Small power-driven vessels (under 12 metres (39 ft)) may carry a single all-round white light in place of the two or three white lights carried by larger vessels, they must also carry red and green navigation lights. Vessels under 7 metres (23 ft) with a maximum speed of less than 7 knots (13 km/h; 8.1 mph) are not required to carry navigation ...
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Most surviving light vessels reside in the United Kingdom and the United States. Some of the lightvessels mentioned in the lists have been renamed more than once, while others have been re-stationed or captured in war. Lightvessels were also not as permanent as a building or structure which helped lead to the replacement of others.
Light vessel no. 3, Lightvessel no. 68: Humber Humber Conservancy Board: Humber: Helwick (from 1937 until 1942) Maintained by Humber Conservancy Board. Kentish Knock Kentish Knock: North Sea: Light vessel no. 3, Lightship 2000, Jenni Baynton (from 1949 until 1953) Smiths Knoll Smiths Knoll 52°43′30″N 2°18′0″E [22] Trinity House: North Sea
Leading lights, also known as range lights in the United States, are a pair of light beacons used in navigation [2] to indicate a safe passage for vessels entering a shallow or dangerous channel; they may also be used for position fixing. At night, the lights are a form of leading line that can be used for safe navigation. The beacons consist ...
A Morse code light is light in which appearances of light of two clearly different durations (dots and dashes) are grouped to represent a character or characters in the Morse Code. For example, "Mo(A)" is a light in which in each period light is shown for a short period (dot) followed by a long period (dash), the Morse Code for "A".
The appropriate lights may also be displayed during the day at times of restricted visibility or other necessary circumstances. [3] Vessels under 7 meters are generally not required to display day shapes even if they are required to display lights at night. [4] A square black flag displayed over the ball may be used as a distress signal. [5]
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).