Isolated Danger Mark (or Buoy) (G.B.)

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2-6-100

Alternative term: Obstruction Mark (or Buoy) (U.S.A.)

A mark (or buoy) used alone to indicate a dangerous reef or shoal. The mark (or buoy) may be passed on either hand.

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

South

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