Which vessel is required by regulations to have an Official Logbook?

Correct Answer: Option B — A 100-gross ton tug on a trip between Baltimore, Maryland, and San Pedro, California.

According to 46 U.S.C. 11301 and 46 CFR, an Official Logbook is legally required for vessels on voyages between a port in the United States and a port on the mainland of another country, or on domestic voyages of specified lengths such as between Atlantic and Pacific ports.