This article is an excerpt from NauticEd’s online Skipper Large Keelboats Course, a comprehensive online sailing course for beginner to intermediate sailors to learn how to sail large sailboats 26 ft (8m) and above. The Skipper Large Keelboats course is part of the Skipper Course Bundle of online courses, also teaching you how to master maneuvering under power and docking!
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Boat Safety Sound Signals
Sound signals are defined and prescribed in the Navigation Rules for International and Inland Waters. Sound has an advantage over light signals, in that it can be used when vision fails. The use of bells, whistles, gongs, horns, etc. can be valuable in many visually impaired conditions. However, the ideal horn is one that is pressurized and can be heard for a long distance. You may want to carry a couple of these as spares.
The Navigation Rules for International sound signals vary slightly from Inland Rules. Refer to the official document for proper use in your sailing area.
The purposes of sounding devices are many including alerting an oncoming vessel of your intentions, signaling an emergency, and identifying yourself in foggy and unclear visual conditions.
These audio devices should be located so they are readily available when needed. When using sound signals there are rules governing the sounding length of time and frequency (how often you send a signal). A short blast is to be one second long and a prolonged blast is to be between 4 and 6 seconds. Between each successive signal, you should wait 10 seconds or more.
The basic sound signals you should know are shown below where
These sounds are to be made by power-driven vessels greater than 12 meters (39ft) in length when operating in a narrow channel and have sighted each other.
The danger signal is general and can be used by anyone to signal disagreement with another vessel’s signal, which may lead to danger or just danger in general to anyone.
When operating in areas of restricted visibility IE fog, a Sailboat must make the following signal.
Where
Power-driven vessels operating in fog must make the following signal not more than 2 minutes apart.
These are international rules. The above list of signals is not exhaustive. For a list of all sound signals visit Rules 32 through 37 of the USCG regs (which again are international).
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