What is the appropriate signal for a power-driven vessel in restricted visibility?

In situations of restricted visibility, such as fog or heavy rain, vessels must use sound signals to communicate their presence to other nearby vessels. A power-driven vessel is required to use one prolonged blast to indicate its presence and direction of travel. This sound signal serves as a warning to other vessels in the vicinity, helping them to determine the location and movement of the power-driven vessel.

The use of a prolonged blast is standardized within maritime navigation rules, and it is essential for maintaining safety on the waterways. Vessels must be able to ascertain when another vessel is nearby, and the prolonged blast ensures that they can do so, especially when visibility is compromised. This signaling is critical for preventing collisions and enhancing situational awareness in an environment where visual communication is limited.

In contrast, other signals such as short blasts or multiple blasts are not appropriate for power-driven vessels in restricted visibility. Each sound signal has specific meanings and purposes, differentiating between actions such as passing or signaling distress. Therefore, understanding and using sound signals correctly is essential for all boaters, particularly in challenging visibility conditions.