Boat Sound Signaling Devices

What Is A Sound Signaling Device?

In the boating world, a sound-signaling device is simply a tool used to communicate specific information on the water. These devices communicate navigational information, call for help, or warn of danger.  

These devices emit sound signals that can be heard by other boats, signaling various messages or warnings. All vessels must have at least one sound signaling device on board. Boats less than 39.4 Feet (12 meters) long require at least one sound signal device.

Those longer than 12 meters require a bell in addition to the air horn or whistle.

Sound Signaling Device Options

When selecting a sound-signaling device for your boat, several options are available. The top three most common choices are both easy to use and inexpensive:

Air Horns

Air horns are popular for their loud and attention-grabbing sound. Their compact size makes them easy to store onboard even smaller boats.

Whistles:

Small, inexpensive, but effective signaling devices that easily fit in your boating tool kit. Whistles are commonly used as a signal on smaller boats and personal watercraft like jet skis. Whistles with a pea inside are not approved because they will not work when waterlogged.

Bells

Bells provide a distinct and recognizable sound. They are typically used on larger vessels but can be used on any boat to supplement other sound-signaling devices.

Common Sound Signal Meanings:

Understanding the most common boat sound signal patterns is imperative for effective communication while on the water.

One Short Blast:

A single short blast communicates the intention to pass another boat on its starboard (right) side.

Two Short Blasts:

Two short blasts signify the intention to pass another boat on its port (left) side. This signal indicates that you plan to pass the other vessel while keeping it to your right side.

Three Short Blasts:

Three short blasts indicate a vessel is backing up. This signal is often used when leaving a dock or maneuvering a boat in reverse.

One Prolonged Blast:

A single prolonged blast, usually lasting four to six seconds, is a warning signal to indicate the vessel's presence and potential danger. It is often used when navigating blind corners, areas of reduced visibility, or approaching an intersection.

Five Short Blasts:

Five short, quick blasts are an emergency signal. This signal draws attention, communicates that you are in distress, and requests help.

These sound signal patterns are not comprehensive and may vary slightly depending on regional or local regulations. Always familiarize yourself with the specific requirements of the area where you are boating, especially when in new locations.