Answer :
A whistle or horn is used when operating a recreational vessel less than 39.4 feet.
When operating a recreational vessel less than 39.4 feet, it is required to have a sound producing device onboard for safety purposes. This device is typically a whistle or horn. The sound producing device serves as an important means of communication and alerting other vessels or individuals in situations where visibility may be limited, such as during fog or at night.
Having a whistle or horn on board allows the operator of the recreational vessel to comply with international regulations and local laws regarding sound signals. In case of an emergency or the need to communicate specific maneuvers or warnings, the sound producing device can be used to emit different types of audible signals. These signals can convey messages such as intention to change direction, warnings of danger, or distress signals.
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