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Day shapes from ColRegs. Day shapes are black in color and their sizes are determined by the ColRegs; for example, the size of the ball is not less than 0.6 metres (2.0 ft). The vertical distance between shapes is at least 1.5 metres (4.9 ft). Vessels of less than 20 metres (66 ft) length may use shapes of smaller size commensurate with the ...
The word is also used in a more specific, technical sense to refer to a signboard or daytime identifier that is attached to a day beacon or other aid to navigation. [2] In that sense, a daymark conveys to the mariner during daylight hours the same significance as the aid's light or reflector does at night. [ 3 ]
This channel is designated by day beacons, though beacons "6" and "9" are omitted. Simple, unnumbered piles are used instead of them. A day beacon (sometimes "daybeacon") is an unlighted nautical sea mark. A signboard identifying it is called a day mark. [1] Day beacons typically mark channels whose key points are marked by lighted buoys. They ...
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.
The shape is an important feature, as colours cannot be distinguished in some light conditions, or by persons with red-green colour blindness. Marks may also carry unique markings of letters and numbers; these may be used to identify the mark as one indicated on a nautical chart. Likewise, a mark's light may flash in a distinctive sequence for ...
The mark has the colour and shapes corresponding to the preferred channel with a band of the other colour to indicate it is the other hand mark for the subsidiary channel. [1] In IALA region A where a minor channel branches off to port the mark at the junction would be a red cylinder with a green band.
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They are recognisable by their red-and-white vertical stripes and commonly bear a top sign in shape of a red ball. They either flash Morse code "A" (di-dah), or one long flash, occulting (more light than dark) or isophase (equal light and dark) every 10 seconds (L Fl 10s).