When a vessel is involved in a marine casualty as defined in 46 CFR 4.03-1, the master or person in charge of the vessel shall:
(a)Ensure compliance with 46 CFR Subpart 4.05, “Notice of Marine Casualty and Voyage Records;” and
(b)Ensure that the voyage records required by 46 CFR 4.05-15 are retained for:
(1)30 days after the casualty if the vessel remains in the navigable waters of the United States; or
(2)30 days after the return of the vessel to a United States port if the vessel departs the navigable waters of the United States within 30 days after the marine casualty.