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, top-mark. It has a distinctive sequence of various flashes that does not match any other navigational mark flashes in its vicinity.

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
Historic wrecks
Protected areas
Outfall pipes
Sewerage pipes
Intake pipes
Submarine 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.

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