A Safe Water Mark, as defined by the International Association of Lighthouse Authorities, is a sea mark used in maritime pilotage to indicate the end of a channel implying that open, deep and safe water lies ahead. The marker is also sometimes known as a Fairway Buoy.
Safe Water Marks are painted half red and half white, vertically, and commonly bear a top-sign in shape of a red ball. Lighted buoys flash white either morse code 'A', isophase (Iso), occulting (Occ) or single long flash every 10 seconds (LFl 10s).
An Isolated Danger Mark, as defined by the International Association of Lighthouse Authorities, is a sea mark used in maritime pilotage to indicate a hazard to shipping such as a partially submerged rock. It is recognisable by its black and red bands and top-mark of two black balls. A light, when fitted, is white showing groups of two flashes (Gp Fl 2).
Safe Water Marks are painted half red and half white, vertically, and commonly bear a top-sign in shape of a red ball. Lighted buoys flash white either morse code 'A', isophase (Iso), occulting (Occ) or single long flash every 10 seconds (LFl 10s).
An Isolated Danger Mark, as defined by the International Association of Lighthouse Authorities, is a sea mark used in maritime pilotage to indicate a hazard to shipping such as a partially submerged rock. It is recognisable by its black and red bands and top-mark of two black balls. A light, when fitted, is white showing groups of two flashes (Gp Fl 2).
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