When an Official logbook is not required, an unofficial logbook is required to be kept aboard for review by a marine inspector for __________.

Correct Answer: Option B — 12 months

When an Official Logbook is not mandated by 46 U.S.C. 11301, vessels are still required to maintain an unofficial logbook. Per USCG policy, this record must be retained aboard for at least 12 months to ensure that marine inspectors have access to a chronological history of vessel operations and safety incidents.