Alternative term: (Unlighted) Beacon (G.B.) Daybeacon (U.S.A.)
An unlighted navigation mark.
Note: In the U.S.A. the word "Daymark" is also used for the daytime character of an aid to navigation.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
centre of gravity
Centre of buoyancy
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM