What is required to be entered into the Official Logbook?

Correct Answer: Option C — Opening a sideport at sea to renew a gasket

46 U.S.C. § 11301 mandates that the Official Logbook contain entries for significant events, including any opening of a sideport at sea. This is critical for safety, as sideports are potential points of ingress for water, and their operation at sea must be documented to ensure proper procedure and vessel integrity.