While on watch at sea you must maintain a proper lookout at all times. On a 700-foot cargo vessel being hand-steered during daylight hours in good visibility and clear of any navigational hazards, the lookout may be __________.

Correct Answer: Option B — the mate on watch

COLREGs Rule 5 mandates a proper lookout by sight and hearing. While the mate on watch may serve as the lookout in specific conditions, the helmsman is prohibited from acting as the lookout while actively steering the vessel, as their primary duty is maintaining the assigned course.