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
It is recognisable by its red and white vertical stripes and round top-mark.
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 morse code "A".