Responsibility for maintaining a proper LookOut using human sight and sound on a boat underway applies to boats during what time?

Responsibility for maintaining a proper LookOut using human sight and sound on a boat underway applies at all times, regardless of the time of day or weather conditions. This is crucial for ensuring safety and preventing collisions with other vessels or obstacles. Operators must always be vigilant and attentive to their surroundings to respond effectively to any potential hazards.