Buoyant beacon

From International Dictionary of Marine Aids to Navigation
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A floating mark secured to a sinker, either directly through a joint or by a cable that is held in tension by the buoyancy of the mark. The buoyancy chamber is normally below the surface of the sea.

Note 1:

The terms resilient beacon and elastic beacon have been used with this meaning, but their continued use is not recommended.

Note 2:

When the connection to the sinker is by a universal joint and the aid carries a light, the term articulated light is sometimes used. This usage is deprecated.

Note 3:

This term was changed to Articulated beacon in October 2012. EEP Report (section AOB) refers.

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

Engineering, Environment and Preservation Committee (IALA now named ENG)

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