Who is typically responsible for compliance with COLREGS rules on a vessel?

The responsibility for compliance with COLREGs rules on a vessel rests collectively with the captain and crew. The captain, as the master of the vessel, holds ultimate authority and accountability for the safety of the ship and its operations. This includes ensuring that all navigational rules and regulations, such as those set out in the COLREGs, are followed at all times.

Moreover, while the captain has the final say, the crew members also play a vital role in observing and implementing these rules during their duties. Each member of the crew is trained and expected to adhere to the COLREGs, whether they are operating the vessel, maintaining lookout, or performing any other function that involves navigation. This collective responsibility ensures that there is a shared understanding of the rules and that the vessel operates safely and within legal boundaries.

In contrast, the other choices suggest a more limited view of responsibility. For instance, while the designated officer on watch has specific duties regarding navigation, they do not bear sole responsibility for compliance. Similarly, the shipowner and the maritime regulatory authority may have roles in ensuring compliance through oversight and setting policies, but they are not directly involved in day-to-day operational compliance on the vessel.