Junction Mark (or Buoy)

From International Dictionary of Marine Aids to Navigation
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A mark (or buoy) which, when viewed from a vessel approaching from the open sea or in the same direction as the main stream of flood tide, or in the direction established by the appropriate authority, indicates the place at which two channels meet. The relative importance of the two channels is usually indicated by the use of a mark (or buoy) having a definite character (shape, colour, light character, shape of topmark, etc.).

Ch2 Fig53.jpg

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM