What is the importance of having a horn or whistle onboard?

The importance of having a horn or whistle onboard lies in its function as a signaling device. It serves as a means to signal your presence or communicate with other boaters, especially in conditions where visibility is low or when other vessels are nearby. This communication is vital for safety on the water, as it helps prevent collisions and ensures that all boaters are aware of each other's positions and intentions.

Using sound signals allows boaters to share information about their movements and to alert others of their approach, particularly in situations where visual contact may not be possible. This is essential not only in preventing accidents but also in maintaining a safe and enjoyable boating environment for everyone. The other choices do not emphasize the primary safety role that a horn or whistle plays in increasing awareness and communication among boaters.