Special mark
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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. If a light is
A Special mark indicating an outfall pipe in the Irish Sea off Helen's Bay, Northern Ireland. It has the group flashing sequence "Fl(2) Y" meaning it flashes yellow twice followed by a longer period of darkness.
Lateral mark
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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 t
A Region A lateral mark, showing both the green color and the triangular symbol, denoting the channel at the entrance to the Port River near Adelaide, South Australia
IALA region A: Red port / green starboard marks when entering from sea into Le Palais, France