401.57—Disembarking or boarding.
(a)
Except as authorized by an officer, no person, other than a member of the crew of a vessel passing through, shall disembark or board any vessel while the vessel is passing through.
(b)
No member of the crew of a vessel passing through shall disembark or board except for the purpose of carrying out essential duties as directed by the Master.
(c)
Persons disembarking or boarding shall be assisted by a member of the vessel's crew under safe conditions.