life-saving equipment [3]
Instruments and equipment for signaling a boat’s presence and for saving people from drowning.
distress beacon 
Device that automatically transmits a radio distress signal giving its precise position.
strobe 
Lamp that produces an intense light from a gas, which glows between two electrodes.
antenna 
Metal rod that emits the radio signal into the atmosphere.
fog horn 
Instrument that makes a regulation sound when visibility is reduced to indicate the presence of a boat.
trumpet 
Bell mouth that amplifies the sound emitted by a diaphragm when compressed air passes over it.
canister 
Small container of compressed air.