Requirements to Have Sound-Producing Devices

In periods of reduced visibility or whenever a vessel operator needs to signal his or her intentions or position, a sound-producing device is essential. The navigation rules for meeting head-on, crossing, or overtaking situations are examples of when sound signals are required.

These requirements apply to vessels operating on South Dakota state waters.

• Vessels less than 16 feet in length, which includes PWC, are not required by state law to carry a sound-producing device. However, it is highly recommended that these vessels carry at least a whistle.
• Vessels that are 16 feet but less than 26 feet in length are required to carry on board a whistle or some other means to make an efficient sound signal audible for at least one-half mile.
• Vessels that are 26 feet but less than 40 feet in length are required to carry on board a power-operated whistle audible for at least one mile.
• Vessels that are 40 feet or more in length are required to carry on board a bell and a power-operated whistle audible for at least one mile.

These requirements apply to vessels operating on federally controlled waters.

• Vessels less than 39.4 feet (12 meters) in length, which includes PWC, must have some way of making an efficient sound signal. Examples are a handheld air horn, an athletic whistle, an installed horn, etc. A human voice is not acceptable.
• Vessels that are 39.4 feet (12 meters) or more in length must have a sound-producing device that can produce an efficient sound signal. The sound signal should be audible for one-half mile and should last for 4 to 6 seconds.