What is the purpose of sound signals in navigation?

The purpose of sound signals in navigation is primarily to communicate a vessel's position and intentions in low visibility conditions, such as fog or heavy rain, where visual signals may not be effective. Sound signals help to ensure safety on the water by alerting other vessels to your presence and maneuvers. This communication is critical to preventing collisions and maintaining situational awareness among maritime traffic.

Sound signals, such as whistles or horns, are standardized according to maritime regulations, allowing for a universal understanding among different vessels of various sizes and types. When a vessel sounds its horn, it conveys specific information regarding its actions, such as its intention to anchor, change course, or pass another vessel. By using these signals effectively, mariners can navigate safely despite limited visibility, thus enhancing overall maritime safety.

Other choices address different aspects of maritime communication but do not focus on the core purpose of sound signals. For instance, indicating speed, warning fishing boats, or relaying emergency messages, while important, do not encompass the primary function of sound signals in the context of navigation safety and intent communication.