Code of Federal Regulations Title 33. Navigation and Navigable Waters § 33.401.35 Navigation underway

(a) Man the propulsion machinery of the vessel, including the main engine control station;

(b) Operate the propulsion machinery so that it can respond immediately through its full operating range;

(c) Man the wheelhouse of the vessel at all times by either the master or certified deck officer, and a helmsman, and;

(d) Have sufficient well rested crewmembers available for mooring operations and other essential duties.