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

The most prudent course of action when uncertain about whether a vessel is overtaking another is to assume that it is overtaking and act accordingly. This reflects the cautious approach mandated by the COLREGs to prevent collisions at sea. According to Rule 13, which deals with overtaking situations, a vessel that is overtaking another must keep clear of the vessel being overtaken.

If a vessel is unsure, operating under the assumption that it is overtaking ensures that it takes the necessary measures to avoid a potential collision. This proactive approach prioritizes safety, as failing to act appropriately can lead to dangerous situations.

While evaluating the speed of the other vessel or requesting clarification might seem logical options, these do not ensure immediate safety and could lead to confusion or delay. Assuming overtaking status allows for a clear and decisive response, adhering to the principle of caution in navigational practices.