According to the rules, what should a vessel do if there is any uncertainty about the navigation situation?

When a vessel encounters uncertainty regarding the navigation situation, making a cautious alteration to course is aligned with the principles outlined in the COLREGs. This approach emphasizes the importance of proactive decision-making in maritime navigation to prevent potential collisions. By cautiously altering course, a vessel can navigate away from potential hazards and provide more time to assess the situation accurately.

Maintaining speed while awaiting clarity may increase the risk of collision, as it does not account for potential dangers surrounding the vessel. Assuming the most dangerous situation can lead to unnecessary panic or drastic actions that may not be warranted. Remaining idle without making any adjustments can leave a vessel vulnerable to unforeseen circumstances, resulting in a higher risk of collision. Therefore, making a cautious alteration to course is the most responsible and effective action to ensure safety in uncertain navigation situations.