46 CFR § 105.15 - Cargo transfer operations.
(a) The operation must comply with any conditions listed in the vessel's certificate of compliance;
(b) The person in charge of the operation must ensure that -
(1) Any galley fire is safely maintained during the operation or immediately extinguished if it cannot be so maintained; and
(2) No smoking takes place in the vicinity of the operation.
(c) A red flag by day or a red electric lantern at night, visible on all sides, must be used to signal a dockside transfer operation. For non-dockside transfer operations, a red flag must be used to signal the operation; and
(d) During a dockside transfer operation, a placard must be displayed to warn persons approaching the gangway. The placard must use letters at least 2 inches high, bear the heading “Warning,” and prohibit open lights, smoking, or visitors.