What does "Rule 5" require of every vessel regarding lookouts?

Rule 5 of the USCG Rules of the Road emphasizes the critical importance of maintaining a proper lookout by sight and hearing at all times. This requirement is fundamental to safe navigation and collision avoidance, regardless of the vessel's size, type, or the time of day. A lookout provides the navigational watch with additional situational awareness, enabling them to see and hear potential hazards and take appropriate actions to prevent accidents.

The rule does not limit the responsibility to certain vessels or conditions; instead, it applies universally to all vessels engaged in navigation. This ensures that mariners are alert to the surroundings, including the presence of other vessels, navigational markers, and potential obstacles, thus enhancing safety on the water.