That no such vessel shall be navigated unless she shall have on board and in her service one duly licensed master. (Mar. 3, 1913; sec. 2.)
That every such vessel of one thousand gross tons and over, propelled by machinery, shall have in her service and on board three licensed mates, who shall stand in three watches while such vessel is being navigated, unless such vessel is engaged in a run of less than four hundred miles from the port of departure to the port of final destination, then such vessel shall have two licensed mates; and every vessel of two hundred gross tons and less than one thousand gross tons, propelled by machinery, shall have two licensed mates.
That every such vessel of one hundred gross tons and under two hundred gross tons, propelled by machinery, shall have on board and in her service one licensed mate; but if such vessel is engaged in a trade in which the time required to make the passage from the port of departure to the port of destination exceeds twenty-four hours, then such vessel shall have two licensed mates.
That nothing in this section shall be so construed as to prevent local inspectors from increasing the number of licensed officers on any vessel subject to the inspection laws of the United States if, in their judgment, such vessel is not sufficiently manned for her safe navigation: _Provided_, That this section shall not apply to fishing or whaling vessels, yachts, or motor boats as defined in the Act of June ninth, nineteen hundred and ten.
It shall be unlawful for the master, owner, agent, or other person having authority, to permit an officer of any vessel to take charge of the deck watch of the vessel upon leaving or immediately after leaving port, unless such officer shall have had at least six hours off duty within the twelve hours immediately preceding the time of sailing, and no licensed officer on any ocean or coastwise vessel shall be required to do duty to exceed nine hours of any twenty-four while in port, including the date of arrival, or more than twelve hours of any twenty-four at sea, except in a case of emergency when life or property is endangered. Any violation of this section shall subject the person or persons guilty thereof to a penalty of one hundred dollars. (Sec. 3.)