What requirement applies to vessels under 12 meters in length regarding sound signals?

Vessels under 12 meters in length are required to have a means of sound signaling, and a whistle is an acceptable device for fulfilling this requirement. The purpose of sound signals is to ensure that vessels can communicate their presence and intentions to others, especially in conditions where visibility is poor, such as in fog or heavy rain.

While these smaller vessels have some exemptions under certain circumstances, the specific requirement for sound signaling helps maintain safety on the water by allowing for the acknowledgment of nearby vessels and obstacles, contributing to collision avoidance. Such measures are critical for all vessels operating in shared waterways to ensure effective communication and safety.

A foghorn, while another form of sound signaling device, is not specifically mandated for small vessels, and carrying a radio is also not a requirement related to sound signals. Therefore, having a whistle satisfies the essential need for audible communication in maritime operations for vessels of this size.