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Vessels of less than 20 metres (66 ft) length may use shapes of smaller size commensurate with the size of the vessel. [2] Day shapes of standard and reduced sizes are both commercially available. Day shapes are commonly constructed from a light weight frame covered with fabric and are designed to be collapsible for ease of storage.
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".
Schedule K is a geographic coding scheme originally developed by the United States Maritime Administration and currently maintained by the United States Army Corps of Engineers to identify seaports handling waterborne shipments involved with foreign trade of the United States.
Annex I: Positioning and technical details of lights and shapes 85 Annex II: Additional signals for fishing vessels fishing in close proximity 86 Annex III: Technical details of sound signal appliances 87 Annex IV: Distress signals 88 Annex V: Pilot rules 89 Inland navigation rules: implementing rules 90 Inland rules: Interpretative rules
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.
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 ...
Likewise, a mark's light may flash in a distinctive sequence for the same purpose. When a channel divides, as for instance a channel to a smaller harbour off a main river, then a preferred channel or bifurcation mark is used. The mark has the same shape and main colour as a port- or starboard- hand mark for the main channel.
Diagram of cardinal marks as seen during the day, with their light patterns. 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.