Buoyage and beaconage
Alternative term: Sea-marking (G.B.)
Ensemble of beacons, buoys, seamarks and small lights to assist the safe and easy movement of ships.
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