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Special mark

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Special mark

A Special Mark, as defined by the International Association of Lighthouse Authorities, is a sea mark used in maritime pilotage. It is recognisable by its yellow colour and X, (often referred to as a St. Andrews Cross) top-mark. It has a distinctive sequence of various flashes that does not match any other navigational mark flashes in its vicinity.

Contents

Purpose

Special marks can indicate:

  • Administrative areas
  • Water skiing areas
  • Anchorage areas
  • Mooring areas
  • Waiting areas
  • Marine farms
  • Oil wells
  • Dead ends
  • Pipelines
  • Spoil ground (an area where dredged material is deposited)
  • Historic wrecks
  • Protected areas
  • Outfall pipes (such as Stormwater, and Cooling water)
  • Sewerage pipes
  • Intake pipes
  • Cables
  • Power cables
  • Other uses

  • Buoys, such as a Weather buoy or Mooring buoy are coloured yellow or have a yellow light to indicate it is not an aid to navigation.
  • References

    Special mark Wikipedia


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