If you travel overseas, you must learn the International Rules. The following information reflects Inland Rules. Inland Rules signal intended action and International Rules signal what you are actually doing. Note: Inland Rules regarding sound signals are occasionally different from International Rules. However, if you don't understand their intentions, or feel that their proposed maneuver is dangerous to either vessel, then you are required to sound the DANGER signal. Remember, that when you approach another vessel and hear either one or two short blasts, and you both understand their signal and can safely let them do it, then you are required to respond with the same signal in response. Five Short Blasts - This is the DANGER signal.This is what is sounded when you are departing a dock in reverse. One prolonged blast indicates you are getting under way, and three short blasts indicate you are backing up. One Prolonged Blast + Three Short Blasts – This is technically two different signals in succession.
Three Short Blasts - This means you are operating in astern propulsion, for example backing away from a dock.If you are behind another boat, going the same direction and about to overtake it, two short blasts means: "I intend to pass you on YOUR port side, MY starboard side." When you pass near another boat, you will manuever by leaving them on your right side as you pass. Two Short Blasts - This means "I intend to leave you on MY starboard side".It is sometimes referred to as the “blind bend signal". A prolonged blast is also sounded when a vessel is approaching a bend in a river where vessels coming from another direction cannot be seen. It signals to others a change in status and that you are getting underway. One Prolonged Blast - This means you are leaving a dock or departing your slip.If you are behind another boat, going the same direction and about to overtake it, one short blast means: "I intend to pass you on YOUR starboard side, MY port side". When you pass near another boat, you will manuever by leaving them on your left side as you pass. One Short Blast - This means "I intend to leave you on MY port side".When power-driven vessels are in sight of one another and meeting or crossing at a distance within half a mile of each other, each vessel underway, when maneuvering as authorized or required by the Inland rules must use the following sound signals. There are different blasts combinations for various movements on the water that may use both short and prolonged blasts. Prolonged Blast - Lasts from four to six seconds.There are two different blasts used for warning and steering signals. Only the fog signals listed under the Inland Rules, Rule 35 may be sounded at such time. These signals must never be used in fog or other conditions of reduced visibility, where the vessels are not visible to each other by eye. Sound signals are to be used only when vessels are in sight of each other and are meeting or crossing at a distance within half a mile of each other. The mouth of the bell must be at least 7.87 inches in diameter. The whistle must be audible for 1/2 nautical mile. Boats at least 39.4 feet to less than 65.6 feet in length - Must carry a whistle and a bell.Though guns-even pots and pans-can make a suitable sound signal useful in getting attention in an emergency, you should always carry the appropriate equipment. In general, this may be a bell, whistle, or air horn. Boats less than 39.4 feet in length - must carry an efficient sound producing device.There is a great deal of latitude in what type of sound making device you choose, but loud is good!Įquipment for Sound Signals is based on the length of your boat as follows. Virtually every boat is required to have some sound producing device. Understanding what you hear is another step towards being a "complete mariner". Navigation Sounds Just as lights play a significant role in understanding what other boats are doing, so do sounds. Boat Owners Association of The United States
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