What sound-producing device(s) is required when boating on iowa state waters in a 28-foot vessel?

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Vessels less than 12 meters (39.4 Feet) long: An efficient sound-producing device, such as an air horn or whistle is required.

Vessels greater than 12 meters (39.4 Feet) long: In addition to an airhorn or whistle a bell is required.

Unpowered boat operators are required to carry a device capable of sounding a prolonged blast for 4-6 seconds that can be heard by another boat operator in time to avoid a collision.

An athletic coach's whistle is an acceptable sound producing device for unpowered boats. It is unlawful to use a sound producing device on the water under any circumstance except a situation in which assistance is needed because of immediate or potential danger to the persons onboard or it is necessary to attract the attention of another boat.

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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, and overtaking situations are examples of when sound signals are required.

If on State Waters or on Mississippi River, Missouri River, or Federal Reservoirs*
Less than 16 feet long (Class I)	None required, but at least a whistle is recommended
16 feet long or longer but less than 26 feet long (Class II)	Whistle or other sound-producing device required
26 feet long or longer (Class III or IV)	Whistle or other sound-producing device and a bell required

*Federal reservoirs in Iowa include Saylorville, Red Rock, Rathbun, and Coralville Reservoirs.

If on Federally Controlled Waters
Less than 39.4 feet (12 meters) long (includes PWC)	Something such as handheld air horn, an athletic whistle, or an installed horn required
39.4 feet (12 meters) long or longer	Sound signal should be audible for one-half mile and should last for 4 to 6 seconds