What should a vessel do if it hears a fog signal from another vessel ahead of her beam according to Rule 19e?

Under Rule 19e of the COLREGs, a vessel that hears a fog signal from another vessel ahead of her beam is required to reduce speed to the minimum necessary to stay on course. This rule is put in place to enhance safety in conditions of reduced visibility, such as fog, where the risk of collision is significantly increased.

By reducing speed, the vessel allows for better maneuverability and more time to assess the situation, including the relative positions of both vessels. This cautious approach is essential because the exact nature of the threat may not be clear, and maintaining a slower speed can help prevent accidents while navigating through potentially dangerous waters.

The emphasis on staying on course while minimizing speed reflects the need to maintain control over the vessel while still being able to react to any developments. Quick maneuvers or changes in speed, such as increasing speed or changing course immediately, could lead to confusion and risk of collision, especially in reduced visibility where the actions of nearby vessels are unpredictable. Waiting for clearer visibility before taking action might not be a viable option if another vessel is already in proximity, as delays could lead to accidents. Thus, maintaining control through a cautious approach is paramount.