Which of the following is a recommended action under Rule 5?

• A. Maintain a proper lookout by sight and hearing at all times
• B. Ignore other vessels in poor visibility
• C. Rely solely on radar
• D. Use all available means appropriate to the circumstances to maintain a proper lookout

Answer: (D)

Rule 5 requires a continuous, proper lookout and the use of all available means to assess the situation. The best action reflects that you should actively employ every appropriate tool and method to maintain that lookout, adapting to circumstances. Keeping a watch by sight and hearing is essential, but you must also use additional means such as radar, AIS, and other sensors to detect hazards and track other vessels, especially in poor visibility or when they’re not easily seen. Relying solely on one method or ignoring others fails to provide the full awareness required to prevent collisions. Using all available means appropriate to the circumstances to maintain a proper lookout best satisfies the standard of Rule 5.