Code of Federal Regulations Title 46. Shipping § 46.307.9 When to report

(1) Departure Reports must be sent as soon as practicable upon leaving the Port of Departure.

(2) Position Reports must be sent within twenty-four hours of departure, and subsequently, no less frequently that every forty-eight hours until arrival.

(3) Arrival Reports must be sent immediately prior to or upon arrival at the Port of Destination.

(4) Deviation Reports may be sent at the discretion of the vessel operator. Reports may be sent more frequently than the above schedule, as, for example, in heavy weather or under other adverse conditions.