Rule 33 of the International Regulations for Preventing Collisions at Sea (COLREGS), as referenced in the SOLAS (Safety of Life at Sea) convention, pertains to equipment for sound signals on vessels. It specifies what sound-producing devices vessels of different sizes must carry.
Sound Signal Appliance Requirements per Rule 33:
Rule 33 essentially mandates the following:
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Vessels of 12 meters or more in length: Must carry a whistle and a bell.
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Vessels of 100 meters or more in length: Must carry a whistle, a bell, and a gong. The bell and gong must be tone-distinct from one another.
Further Clarification
The rule emphasizes that these sound signaling devices should meet the technical specifications outlined in Annex III of the COLREGS, to ensure audibility and standardization of signals. Rule 34 of COLREGS then defines the specific maneuvering and warning signals that vessels use these whistles, bells, and gongs to produce.
Therefore, Rule 33 ensures that all vessels are equipped to make appropriate sound signals, contributing to maritime safety by enabling effective communication in conditions of reduced visibility.
