Which COLREGS Rule requires maintaining a proper lookout at all times?

• A. Rule 8 – Action to Avoid Collision
• B. Rule 9 – Narrow Channels
• C. Rule 13 – Overtaking
• D. Rule 5 – Lookout

Answer: (D)

Maintaining a proper lookout at all times is the first line of defense against collisions. The rule requires a vessel to keep a proper and efficient lookout by sight and hearing, and by all available means appropriate to the circumstances. This duty is continuous—night or day, in clear or poor visibility, in crowded waters or open sea—and applies to the watchstander using eyes, ears, radar, AIS, and other tools as conditions allow. Being vigilant about other vessels, hazards, lights, signals, and changing conditions provides the early warning needed to take timely actions when a risk of collision develops. The other rules relate to what to do when a risk is detected or in specific situations, but it’s this ongoing lookout that makes those actions possible.