Under Rule 5, what is required of a proper look-out?

• A. Only listen for radio transmissions to detect traffic.
• B. Maintain a continuous watch using sight and hearing to detect other vessels and hazards.
• C. Maintain look-out only when in fog or at night.
• D. Rely on radar exclusively for detecting targets.

Answer: (B)

The main idea is that a proper look-out must be continuous and use all available senses and tools to detect other vessels and hazards. Rule 5 requires you to stay vigilant at all times, watching with your eyes and listening with your ears, and to use any appropriate means to spot traffic and dangers early so you can take action to avoid collisions. The best option captures that continuous, multi-sense watch for traffic and hazards, not relying on a single sense or instrument. The other choices fall short because they limit the lookout to listening for radio transmissions, or to specific conditions (fog or night), or to using radar exclusively. A safe lookout means constant visual and audible vigilance, with radar and other aids used as appropriate, but never as the sole method.