What is the sound-producing device requirement for vessels 16 to 26 feet long?

For vessels measuring 16 to 26 feet in length, the sound-producing device requirement is a whistle capable of a two-second blast audible for at least one-half mile. This requirement is part of safety regulations aimed at enhancing communication and navigation safety on the water.

A whistle fulfills these criteria effectively due to its design, which allows for clear sound production over a distance, making it suitable for signaling to other vessels or communicating in emergencies. The specific mention of a two-second blast ensures that the sound is not just a quick beep but a sustained signal, which is essential for being heard over ambient noise on the water. The distance of one-half mile is established to ensure that the vessel can signal effectively to others who may be nearby, helping to prevent collisions and enhance navigation safety.