What is the purpose of "sound signals" in maritime operations?

The purpose of "sound signals" in maritime operations is primarily to communicate intentions, warnings, or navigation information in limited visibility conditions, such as fog, rain, or darkness. Sound signals, which include blasts from whistles or horns on vessels, serve as an essential means of communication that helps to prevent collisions and enhances safety on the water. For instance, a vessel might blow a horn to indicate its intention to maneuver, alert others of its presence, or signal specific actions, such as passing another vessel.

In areas with restricted visibility, visual signals like lights may not be as effective, making sound signals even more crucial for conveying the necessary information to other mariners. This practice aligns with international maritime regulations, ensuring that all vessels can maintain safe navigation and avoid dangerous situations despite poor visibility.