46 CFR § 4.05-1 - Notice of marine casualty.
(a) Immediately after the addressing of resultant safety concerns, the owner, agent, master, operator, or person in charge, shall notify the nearest Sector Office, Marine Inspection Office or Coast Guard Group Office whenever a vessel is involved in a marine casualty consisting in -
(1) An unintended grounding, or an unintended strike of (allision with) a bridge;
(2) An intended grounding, or an intended strike of a bridge, that creates a hazard to navigation, the environment, or the safety of a vessel, or that meets any criterion of paragraphs (a) (3) through (8);
(3) A loss of main propulsion, primary steering, or any associated component or control system that reduces the maneuverability of the vessel;
(4) An occurrence materially and adversely affecting the vessel's seaworthiness or fitness for service or route, including but not limited to fire, flooding, or failure of or damage to fixed fire-extinguishing systems, lifesaving equipment, auxiliary power-generating equipment, or bilge-pumping systems;
(5) A loss of life;
(6) An injury that requires professional medical treatment (treatment beyond first aid) and, if the person is engaged or employed on board a vessel in commercial service, that renders the individual unfit to perform his or her routine duties; or
(7) An occurrence causing property-damage in excess of $75,000, this damage including the cost of labor and material to restore the property to its condition before the occurrence, but not including the cost of salvage, cleaning, gas-freeing, drydocking, or demurrage.
(c) Except as otherwise required under this subpart, if the marine casualty exclusively involves an occurrence or occurrences described by paragraph (a)(8) of this section, a report made pursuant to 33 CFR 153.203, 40 CFR 117.21, or 40 CFR 302.6 satisfies the immediate notification requirement of this section.