A sound signal made with the whistle of the vessel



Related Terms

GENERAL EMERGENCY ALARM

A sound signal of seven short blasts and one long blast given with the vessel ́s sound system

WHISTLE

A sound signal emitter comprising a resonator having an orifice of suitable shape such that when a jet of air is passed through the orifice the turbulence produces a sound.

REED HORN

A sound signal emitter comprising a resonant horn excited by a jet of air which is modulated by a vibrating reed. The signal is a high-pitched note.

ORIENTABILITY OF A SOUND SIGNAL

The property of a sound signal by virtue of which a listener can estimate the direction of the location of the signal.

DIAPHONE

A sound signal emitter operating on the principle of periodic release of compressed air controlled by the reciprocating motion of a piston operated by compressed air. The diaphone usually emits a powerful sound of low pitch which often concludes with a brief sound of lowered pitch called the GRUNT. The emitted signal of a TWO-TONE DIAPHONE consists of two tones of different pitch, in which case the second tone is of lower pitch.

FOG HORN

A sound signal device.

LIGHT STATION

A manned station providing a light usually of high intensity and reliability. It may also provide sound signal and radiobeacon services.

GONG

A sound signal producing a sound by the vibration of a resonant disc struck by a clapper

SIREN

A sound signal emitter using the periodic escape of compressed air through a rotary shutter.

INOPERATIVE

Said of a sound signal or radionavigation aid out of service due to a malfunction

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