If a vessel is unsure whether it is overtaking another, what should it do?

In situations where a vessel is unsure whether it is overtaking another vessel, the prudent course of action is to assume it is overtaking and act accordingly. This approach is consistent with the COLREGs rules, specifically Rule 13, which addresses overtaking situations.

By assuming the role of an overtaking vessel, the navigating vessel takes the necessary precautions to avoid a collision. This includes altering its course and speed to ensure safe passage. The idea is to treat the situation as if it were an overtaking scenario until it can be confirmed otherwise. This conservative method prioritizes safety and minimizes the risk of a collision, which is a fundamental principle in maritime navigation.

Moreover, actively assuming the responsibility of the overtaking vessel, rather than ignoring the possibility, aligns with the duty to avoid collisions. It emphasizes the need for vigilance and caution in navigating close quarters at sea. The other options do not emphasize the importance of acting to prevent possible misunderstandings or miscalculations that could lead to dangerous situations on the water.