What should a vessel do if it is unsure about collision risk?

In situations where a vessel is unsure about the risk of collision, taking evasive actions immediately is the appropriate response. According to the COLREGs, all vessels have a duty to avoid collisions. When uncertainty exists regarding the potential for a collision, it is better to err on the side of caution and take evasive actions rather than maintaining the current course or assuming there is no risk.

This approach aligns with the precautionary principles in maritime navigation, emphasizing the need to actively assess and manage risks rather than waiting for a clearer indication of danger. By taking action, such as altering speed or course, a vessel can ensure better situational awareness and safety, minimizing the risk of a collision. In many cases, timely evasive maneuvers can help prevent a dangerous situation from developing, which is why prompt action is emphasized in this context.

Remaining on a steady course or assuming there is no risk can lead to a dangerous delay in response, potentially resulting in a collision. Moreover, investigating further without altering course might also create an increased risk, as it could prevent the vessel from responding effectively to an imminent hazard.