On a sea going towing vessel of 150 gross tons, there are six (6) seamen in the deck crew. How many certificated able seamen are required if the voyage is over 600 miles?

Correct Answer: Option D — 4

Per 46 CFR 15.605, vessels over 100 gross tons on voyages exceeding 600 miles must have 65% of the deck crew as Able Seamen. With six deck crew members, 65% equals 3.9. Since you cannot have a fraction of a person, you must round up to 4 required Able Seamen.