Fog signal

From International Dictionary of Marine Aids to Navigation
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3-1 -030

(Sound) Fog signal

An audible signal intended to warn or guide ships in low visibility.

Also called Audible Signal or Sound Signal.

Source: IALA Guideline G1090 on The Use of Audible Signals Edition 1 December 2012.

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