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.
The terms resilient beacon, buoyant beacon and elastic beacon have been used with this meaning, but their continued use is not recommended.
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.
This term was previously 8-4-065 Buoyant beacon - EEP19 Report (section AOB) refers.