What is required of every vessel regarding look-out?

The requirement for every vessel to maintain a proper look-out is specified in Rule 5 of the COLREGs, which emphasizes the importance of being vigilant to avoid collisions. Maintaining a proper look-out involves using all available means, including sight, hearing, and other sensory tools or devices, to ensure that any potential hazards or other vessels are detected in a timely manner.

This comprehensive approach is essential because navigation conditions can vary significantly, and relying solely on visual observations (such as the option suggesting only visual methods) would not account for potential limitations in visibility or situations where auditory cues are crucial. Additionally, the necessity for a look-out extends beyond just foggy conditions; it is required at all times to maintain safety on the water, correcting the notion that look-out is only essential in poor visibility situations. Furthermore, the responsibility of keeping a proper look-out is not limited to the captain alone; it is a collective responsibility that may involve crew members, ensuring continuous vigilance across the vessel.