Essential Boating Safety: Mastering Sound Signals While Out on the Water
A boater’s guide to sound signals
Sound signals on a boat are essential to help you communicate intentions and navigate safely with other vessels. Knowing how and when to use these signals will not only keep you and others safe but also enhance your overall boating experience. Here’s a guide to understanding and using boat sound signals.
Legal Requirements
Sound signaling equipment varies depending on your boat’s length:
Boats less than 39.4 feet need an effective sound-producing device, such as a bell, whistle, or air horn. While unconventional items like pots and pans can make loud noise in an emergency, it’s best to stick with approved devices.
Boats between 39.4 and 65.6 feet must have both a whistle and a bell. The whistle should be audible for at least half a nautical mile, and the bell’s mouth should be at least 7.87 inches in diameter.
When and How to Use Sound Signals
Sound signals are used when vessels are within sight of each other and within half a mile. They should not be used in fog or poor visibility. Use fog signals as specified by the Inland Rules instead.
Sound signals are expressed in “blasts.” A short blast is about one second long. A prolonged blast lasts between four and six seconds.
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Proper Use of Signals
One short blast indicates you intend to pass another vessel on your port side. Two short blasts signify you intend to pass on the starboard side. Three short blasts indicate that you are operating in reverse, such as backing away from a dock. One prolonged blast is used when departing a dock. It signals a change in status or warns others about limited visibility.
One prolonged blast plus three short blasts are used when departing a dock in reverse—one prolonged blast for getting underway and three short blasts for backing up.
Five short blasts mean danger. Use it if you’re unclear about another vessel’s intentions or think there is a risk of collision.
Always respond to signals from passing boats in kind, especially in poor visibility. Never assume the meaning of an unfamiliar horn signal. If possible, communicate with the vessel emitting the horn blast using radio or visual signals to understand the message being conveyed.
Mastering these sound signals will enhance your communication on the water and contribute to a safer boating experience.
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