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  2. Cardinal mark - Wikipedia

    en.wikipedia.org/wiki/Cardinal_mark

    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 ) relative to the mark.

  3. Safe water mark - Wikipedia

    en.wikipedia.org/wiki/Safe_water_mark

    They are also known as fairway buoys and clear water buoys. 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).

  4. Light characteristic - Wikipedia

    en.wikipedia.org/wiki/Light_characteristic

    Graphical and textual descriptions of navigational light sequences and colours are displayed on nautical charts and in Light Lists with the chart symbol for a lighthouse, lightvessel, buoy or sea mark with a light on it. Different lights use different colours, frequencies and light patterns, so mariners can identify which light they are seeing. [1]

  5. How do boaters avoid hazards? What to know about markers ...

    www.aol.com/boaters-avoid-hazards-know-markers...

    Just like traffic lights and signs help drivers on the road, boaters have buoys and signs to guide them to and from shore safely. Just like traffic lights and signs help drivers on the road ...

  6. Sea mark - Wikipedia

    en.wikipedia.org/wiki/Sea_mark

    Marks are shown on nautical charts, using symbols that indicate their colour, shape and light characteristic, and are usually identified by name or number. In a wider sense the phrase "sea mark" is often understood to include all types of landmarks, structures and devices that can be used to provide warning and guiding signs to mariners.

  7. Lateral mark - Wikipedia

    en.wikipedia.org/wiki/Lateral_mark

    A lateral buoy, lateral post or lateral mark, as defined by the International Association of Marine Aids to Navigation and Lighthouse Authorities, is a sea mark used in maritime pilotage to indicate the edge of a channel. Each mark indicates the edge of the safe water channel in terms of port (left-hand) or starboard (right-hand).