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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 ...
For example, for vessels greater than 50 metres in length, the visibility ranges of lights are 6 miles for masthead lights, 3 miles for sidelights, 3 miles for the sternlight, 3 miles for towing lights and 3 miles for an all round light. [27] Rule 23 – Power-driven Vessels Underway Rule 24 – Towing and Pushing
A dracone barge is a large flexible watertight tube intended to carry a liquid cargo while towed mostly-submerged behind a ship. One large current example of the type has a capacity of 935 cubic metres (4.23 m diameter, 91 m long) while weighing only 6.5 tonnes empty. The dracone barge was invented in 1956 by professor William Hawthorne [1] as ...
The International Code of Signals (INTERCO) is an international system of signals and codes for use by vessels to communicate important messages regarding safety of navigation and related matters. Signals can be sent by flaghoist, signal lamp ("blinker"), flag semaphore, radiotelegraphy, and radiotelephony. The International Code is the most ...
International maritime signal flags. International maritime signal flags are various flags used to communicate with ships. The principal system of flags and associated codes is the International Code of Signals. [1] Various navies have flag systems with additional flags and codes, and other flags are used in special uses, or have historical ...
Watercraft navigation lights must permit other vessels to determine the type and relative angle of a vessel, and thus decide if there is a danger of collision. In general, sailing vessels are required to carry a green light that shines from dead ahead to 2 points (22 + 1 ⁄ 2 °) abaft [note 1] the beam on the starboard side (the right side from the perspective of someone on board facing ...
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 lights shown here are configured as "Quick". A cardinal mark is a sea mark (a buoy or other floating or fixed structure) commonly used in maritime pilotage to indicate the position of a hazard and the direction of safe water. Cardinal marks indicate the direction of safety as a cardinal (compass) direction (north, east, south or west ...