Marine casualty or accident means—

(a) Any casualty or accident involving any vessel other than a public vessel that—

(1) Occurs upon the navigable waters of the United States, its territories or possessions;

(2) Involves any United States vessel wherever such casualty or accident occurs; or

(3) With respect to a foreign tank vessel operating in waters subject to the jurisdiction of the United States, including the Exclusive Economic Zone (EEZ), involves significant harm to the environment or material damage affecting the seaworthiness or efficiency of the vessel.

(b) The term “marine casualty or accident” applies to events caused by or involving a vessel and includes, but is not limited to, the following:

(1) Any fall overboard, injury, or loss of life of any person.

(2) Any occurrence involving a vessel that results in—

(i) Grounding;

(ii) Stranding;

(iii) Foundering;

(iv) Flooding;

(v) Collision;

(vi) Allision;

(vii) Explosion;

(viii) Fire;

(ix) Reduction or loss of a vessel's electrical power, propulsion, or steering capabilities;

(x) Failures or occurrences, regardless of cause, which impair any aspect of a vessel's operation, components, or cargo;

(xi) Any other circumstance that might affect or impair a vessel's seaworthiness, efficiency, or fitness for service or route; or

(xii) Any incident involving significant harm to the environment.

(3) Any occurrences of injury or loss of life to any person while diving from a vessel and using underwater breathing apparatus.

(4) Any incident described in § 4.05-1(a).

The term serious marine incident includes the following events involving a vessel in commercial service:

(a) Any marine casualty or accident as defined in § 4.03-1 which is required by § 4.05-1 to be reported to the Coast Guard and which results in any of the following:

(1) One or more deaths;

(2) An injury to a crewmember, passenger, or other person which requires professional medical treatment beyond first aid, and, in the case of a person employed on board a vessel in commercial service, which renders the individual unfit to perform routine vessel duties;

(3) Damage to property, as defined in § 4.05-1(a)(7) of this part, in excess of $200,000;

(4) Actual or constructive total loss of any vessel subject to inspection under 46 U.S.C. 3301; or

(5) Actual or constructive total loss of any self-propelled vessel, not subject to inspection under 46 U.S.C. 3301, of 100 gross tons or more.

(b) A discharge of oil of 10,000 gallons or more into the navigable waters of the United States, as defined in 33 U.S.C. 1321, whether or not resulting from a marine casualty.

(c) A discharge of a reportable quantity of a hazardous substance into the navigable waters of the United States, or a release of a reportable quantity of a hazardous substance into the environment of the United States, whether or not resulting from a marine casualty.

The term individual directly involved in a serious marine incident is an individual whose order, action or failure to act is determined to be, or cannot be ruled out as, a causative factor in the events leading to or causing a serious marine incident.

The term medical facility means an American hospital, clinic, physician's office, or laboratory, where blood and urine specimens can be collected according to recognized professional standards.

The term qualified medical personnel means a physician, physician's assistant, nurse, emergency medical technician, or other person authorized under State or Federal law or regulation to collect blood and urine specimens.

The term chemical test means a scientifically recognized test which analyzes an individual's breath, blood, urine, saliva, bodily fluids, or tissues for evidence of dangerous drug or alcohol use.

The term party in interest shall mean any person whom the Marine Board of Investigation or the investigating officer shall find to have a direct interest in the investigation conducted by it and shall include an owner, a charterer, or the agent of such owner or charterer of the vessel or vessels involved in the marine casualty or accident, and all licensed or certificated personnel whose conduct, whether or not involved in a marine casualty or accident is under investigation by the Board or investigating officer.

The Commandant, U.S. Coast Guard, is that officer who acts as chief of the Coast Guard and is charged with the administration of the Coast Guard.

A Coast Guard district is one of the geographical areas whose boundaries are described in 33 CFR part 3.

The District Commander is the chief of a Coast Guard district and is charged with the administration of all Coast Guard responsibilities and activities within his respective district, except those functions of administrative law judges under the Administrative Procedure Act (60 Stat. 237, 5 U.S.C. 1001 et seq.) and activities of independent units of the Coast Guard, such as the Coast Guard Yard and the Coast Guard Academy.

An investigating officer is an officer or employee of the Coast Guard designated by the Commandant, District Commander or the Officer in Charge, Marine Inspection, for the purpose of making investigations of marine casualties and accidents or other matters pertaining to the conduct of seamen. An Officer in Charge, Marine Inspection, is an investigating officer without further designation.

The term nuclear vessel means any vessel in which power for propulsion, or for any other purpose, is derived from nuclear energy; or any vessel handling or processing substantial amounts of radioactive material other than as cargo.

Public vessel means a vessel that—

(a) Is owned, or demise chartered, and operated by the U.S. Government or a government of a foreign country, except a vessel owned or operated by the Department of Transportation or any corporation organized or controlled by the Department (except a vessel operated by the Coast Guard or Saint Lawrence Seaway Development Corporation); and

(b) Is not engaged in commercial service.

Marine employer means the owner, managing operator, charterer, agent, master, or person in charge of a vessel other than a recreational vessel.

Recreational vessel means a vessel meeting the definition in 46 U.S.C. 2101(25) that is then being used only for pleasure.

Law enforcement officer means a Coast Guard commissioned, warrant or petty officer; or any other law enforcement officer authorized to obtain a chemical test under Federal, State, or local law.

Noxious liquid substance (NLS) means—

(a) Each substance listed in 33 CFR 151.47 or 151.49;

(b) Each substance having an “A,” “B,” “C,” or “D” beside its name in the column headed “IMO Annex II pollution category” in table 1 of part 153 of this chapter; and

(c) Each substance that is identified as an NLS in a written permission issued under § 153.900(d) of this chapter.

Significant harm to the environment means—

(a) In the navigable waters of the United States, a discharge of oil as set forth in 40 CFR 110.3 or a discharge of hazardous substances in quantities equal to or exceeding, in any 24-hour period, the reportable quantity determined in 40 CFR part 117;

(b) In other waters subject to the jurisdiction of the United States, including the EEZ—

(1) A discharge of oil in excess of the quantities or instantaneous rate permitted in 33 CFR 151.10 or 151.13 during operation of the ship; or

(2) A discharge of noxious liquid substances in bulk in violation of §§ 153.1126 or 153.1128 of this chapter during the operation of the ship; and

(c) In waters subject to the jurisdiction of the United States, including the EEZ, a probable discharge of oil, hazardous substances, marine pollutants, or noxious liquid substances. The factors you must consider to determine whether a discharge is probable include, but are not limited to—

(1) Ship location and proximity to land or other navigational hazards;

(2) Weather;

(3) Tide current;

(4) Sea state;

(5) Traffic density;

(6) The nature of damage to the vessel; and

(7) Failure or breakdown aboard the vessel, its machinery, or equipment.

Tank vessel means a vessel that is constructed or adapted to carry, or that carries, oil, hazardous substances, marine pollutants, or noxious liquid substances, in bulk as cargo or cargo residue.

The following definitions apply to this part:

Credential means any or all of the following:

(1) Merchant mariner's document.

(2) Merchant mariner's license.

(3) STCW endorsement.

(4) Certificate of registry.

(5) Merchant mariner credential.

Merchant mariner credential or MMC means the credential issued by the Coast Guard under 46 CFR part 10. It combines the individual merchant mariner's document, license, and certificate of registry enumerated in 46 U.S.C. subtitle II part E as well as the STCW endorsement into a single credential that serves as the mariner's qualification document, certificate of identification, and certificate of service.