Deckhands onboard towing vessels shall be divided into 3 watches when on a trip exceeding __________.

Correct Answer: Option A — 600 miles

46 U.S.C. 8104 mandates that deckhands on towing vessels must be divided into three watches when the voyage exceeds 600 miles. This requirement is designed to prevent fatigue and ensure that the crew remains alert and capable of performing essential duties during extended transits at sea.