(a) With respect to part 16 of this subchapter only, if the definitions in paragraph (b) of this section differ from those set forth in § 16.105, the definition set forth in § 16.105 applies.

(b) As used in this subchapter, the following terms apply only to merchant marine personnel credentialing and the manning of vessels subject to the manning provisions in the navigation and shipping laws of the United States:

Able seafarer-deck means a rating qualified in accordance with the provisions of Regulation II/5 of the STCW Convention.

Able seafarer-engine means a rating qualified in accordance with the provisions of Regulation III/5 of the STCW Convention.

Apprentice mate (steersman) of towing vessels means a credentialed mariner in training to perform bridge watchkeeping duties onboard a towing vessel, who must be under the direct supervision and in the continuous presence of a master or mate (pilot) of towing vessels.

Approved means approved by the Coast Guard.

Approved training means training that is approved by the Coast Guard or meets the requirements of § 10.408 of this part.

Articulated tug barge or ATB means any tug-barge combination which, through the use of an articulated or “hinged” connection system between the tug and barge, allows independent movement in the critical area of fore and aft pitch.

Assistance towing means towing a disabled vessel for consideration.

Assistant engineer, for national endorsements, means a qualified officer in the engine department other than the chief engineer.

Authorized official includes, but is not limited to, a Federal, State or local law enforcement officer.

Ballast control operator or BCO means an officer restricted to service on mobile offshore drilling units (MODUs) whose duties involve the operation of the complex ballast system found on many MODUs. When assigned to a MODU, a ballast control operator is equivalent to a mate on a conventional vessel.

Barge means a non-self propelled vessel as defined in 46 U.S.C 102.

Barge supervisor or BS means an officer restricted to service on MODUs whose duties involve support to the offshore installation manager (OIM) in marine-related matters including, but not limited to, maintaining watertight integrity, inspecting and maintaining mooring and towing components, and maintaining emergency and other marine-related equipment. A barge supervisor, when assigned to a MODU, is equivalent to a mate on a conventional vessel.

Boatswain means the leading seaman and immediate supervisor of deck crew who supervises the maintenance of deck gear.

Boundary line marks the dividing point between internal and offshore waters for the purposes of several U.S. statutes and, with exceptions, generally follows the trend of the seaward, highwater shorelines. See 46 CFR part 7.

Cargo engineer means a person holding an officer endorsement on a dangerous-liquid tankship or a liquefied-gas tankship whose primary responsibility is maintaining the cargo system and cargo-handling equipment.

Ceremonial license means a document that reflects a mariner's existing national officer endorsement and is suitable for framing, but is not valid for use as a Merchant Mariner Credential (MMC).

Chemical tanker means a tank vessel that is certificated to carry or carries chemicals in bulk as cargo or cargo residue. For the purposes of qualifying for an STCW endorsement for advanced chemical tanker cargo operations, this includes tank barges.

Chief engineer means the senior engineer responsible for the mechanical propulsion and the operation and maintenance of the mechanical and electrical installations of the vessel.

Chief mate means the deck officer next in rank to the master and upon whom the command of the vessel will fall in the event of incapacity of the master.

Coast Guard-accepted means -

Coast Guard-accepted QSS organization means an entity that has been approved by the Coast Guard to accept and monitor training on behalf of the Coast Guard.

Coastwise seagoing vessel means a vessel that is authorized by its Certificate of Inspection to proceed beyond the Boundary Line established in part 7 of this chapter.

Coastwise voyage is a domestic voyage and means a voyage in which a vessel proceeds -

Communicable disease means any disease capable of being transmitted from one person to another directly, by contact with excreta or other discharges from the body; or indirectly, via substances or inanimate objects contaminated with excreta or other discharges from an infected person. Pursuant to 42 U.S.C. 12113, the Department of Health and Human Services periodically publishes in the Federal Register a list of infectious and communicable diseases that are transmissible through the food supply, and that list provides examples of communicable diseases for purposes of § 10.304 of this title.

Conviction means that the applicant for a merchant mariner credential has been found guilty, by judgment or plea by a court of record of the United States, the District of Columbia, any State, territory, or possession of the United States, a foreign country, or any military court, of a criminal felony or misdemeanor or of an offense described in section 205 of the National Driver Register Act of 1982, as amended (49 U.S.C. 30304). If an applicant pleads guilty or no contest, is granted deferred adjudication, or is required by the court to attend classes, make contributions of time or money, receive treatment, submit to any manner of probation or supervision, or forgo appeal of a trial court's conviction, then the Coast Guard will consider the applicant to have received a conviction. A later expungement of the conviction will not negate a conviction unless the Coast Guard is satisfied that the expungement is based upon a showing that the court's earlier conviction was in error.

Credential means any or all of the following:

Criminal record review means the process or action taken by the Coast Guard to determine whether an applicant for, or holder of, a credential is a safe and suitable person to be issued such a credential or to be employed on a vessel under the authority of such a credential.

Dangerous drug means a narcotic drug, a controlled substance, or a controlled-substance analogue (as defined in section 102 of the Comprehensive Drug Abuse and Control Act of 1970 (21 U.S.C. 802)).

Dangerous liquid or DL means a liquid listed in 46 CFR 153.40 of this chapter that is not a liquefied gas as defined in this part. Liquid cargoes in bulk listed in 46 CFR part 153, Table 2, of this chapter are not dangerous-liquid cargoes when carried by non-oceangoing barges.

Day means, for the purpose of complying with the service requirements of this subchapter, 8 hours of watchstanding or day-working not to include overtime. On vessels authorized by 46 U.S.C. 8104 and 46 CFR 15.705, to operate a two-watch system, a 12-hour working day may be creditable as 11⁄2 days of service. On vessels of less than 100 GRT, a day is considered as 8 hours unless the Coast Guard determines that the vessel's operating schedule makes this criteria inappropriate; in no case will this period be less than 4 hours. When computing service on MODUs for any endorsement, a day of MODU service must be a minimum of 4 hours, and no additional credit is received for periods served over 8 hours. For cadet service on a training ship furnished by the Maritime Administration under 46 CFR 310.4, a day may be creditable as 11⁄2 days of service.

Deck crew (excluding individuals serving under their officer endorsement) means, as used in 46 U.S.C. 8702, only the following members of the deck department: able seamen, boatswains, and ordinary seamen.

Deck department means the department aboard a ship responsible for navigation, cargo, command, and control functions.

Designated areas means those areas within pilotage waters for which first-class pilot's endorsements are issued under part 11, subpart G, of this chapter, by the Officer in Charge, Marine Inspection (OCMI). The areas for which first-class pilot's endorsements are issued within a particular Marine Inspection Zone and the specific requirements to obtain them may be obtained from the OCMI concerned.

Designated duty engineer or DDE means a qualified engineer, who may be the sole engineer on vessels with a periodically unmanned engine room.

Designated examiner or DE means a person who has been trained or instructed in techniques of training or assessment on towing vessels and is otherwise qualified to evaluate whether an applicant has achieved the level of proficiency required to hold a towing vessel endorsement on a merchant mariner credential (MMC). This person must be approved by the Coast Guard.

Designated medical examiner means a licensed physician, licensed physician's assistant, or licensed nurse practitioner who has been trained and approved to conduct medical and physical examinations of merchant mariners on behalf of the U.S. Coast Guard and may be delegated limited authority to grant waivers and approve physical/medical suitability for service.

Directly supervised/direct supervision (only when referring to issues related to tankermen) means being in the direct line of sight of the person-in-charge or maintaining direct, two-way communications by a convenient, reliable means, such as a predetermined working frequency over a handheld radio.

Disabled vessel means a vessel that needs assistance, whether docked, moored, anchored, aground, adrift, or underway. This does not mean a barge or any other vessel not regularly operated under its own power.

Document of Continuity means a document issued by the Coast Guard to seafarers who are unwilling or otherwise unable to meet the requirements of § 10.227, for the sole purpose of maintaining an individual's eligibility for renewal of an endorsement.

Domestic voyage means a voyage from one United States port to another United States port, without entering waters under the jurisdiction of another country unless the United States has entered into a treaty or an agreement with that country respecting mutual recognition of national mariner qualifications. This includes a voyage to nowhere that returns to the originating port.

Drug test means a chemical test of an individual's urine for evidence of dangerous drug use.

Dual-mode integrated tug barge means an integrated tug barge (ITB) involving an articulated (flexible) coupling system where the towing unit rolls and heaves (articulates) about a horizontal pivot point. Dual mode units resemble a conventional tug and are capable of towing in other configurations (astern or alongside).

Electro-technical officer means an officer qualified in accordance with the provisions of Regulation III/6 of the STCW Convention.

Electro-technical rating means a rating qualified in accordance with the provisions of Regulation III/7 of the STCW Convention.

Employment assigned to means the total period of time a person is assigned to work on MODUs, including time spent ashore as part of normal crew rotation.

Endorsement is a statement of a mariner's qualifications and, for the purposes of this chapter, includes only those endorsements listed in § 10.109 of this part.

Engine department means the department aboard a ship responsible for the main propulsion and auxiliary systems, and other mechanical, electrical, hydraulic, and refrigeration systems, including deck machinery and cargo-handling equipment.

Entry-level mariner means a mariner holding no rating other than ordinary seaman, wiper, steward's department, or steward's department food handler (F.H.).

Evaluation means processing an application, from the point of receipt to approval or denial of the application, including review of all documents and records submitted with an application as well as those obtained from public records and databases.

Fails a chemical test for dangerous drugs means that the result of a chemical test conducted under 49 CFR part 40 was reported as “positive” by a Medical Review Officer because the chemical test indicated the presence of a dangerous drug at a level equal to or exceeding the levels established in 49 CFR part 40.

First assistant engineer means the engineer officer next in rank to the chief engineer and upon whom the responsibility for the mechanical propulsion and the operation and maintenance of the mechanical and electrical installations of the vessel will fall in the event of the incapacity of the chief engineer.

Great Lakes, for the purpose of calculating service requirements for an endorsement, means the Great Lakes and their connecting and tributary waters, including the Calumet River as far as the Thomas J. O'Brien Lock and Controlling Works (between miles 326 and 327), the Chicago River as far as the east side of the Ashland Avenue Bridge (between miles 321 and 322), and the Saint Lawrence River as far east as the lower exit of Saint Lambert Lock. For purposes of requiring MMCs with rating endorsements, the connecting and tributary waters are not part of the Great Lakes.

Gross register tons or GRT means the gross ton measurement of the vessel under 46 U.S.C. chapter 145, Regulatory Measurement.

Gross tonnage or GT means the gross tonnage measurement of the vessel under 46 U.S.C. chapter 143, Convention Measurement.

Harbor assist means the use of a towing vessel during maneuvers to dock, undock, moor, or unmoor a vessel, or to escort a vessel with limited maneuverability.

High-speed craft type rating (HSC) means an endorsement for specific duty on a particular type and model of high-speed craft (compliant with the high-speed craft code).

Horsepower or HP means, for the purpose of this subchapter, the total maximum continuous shaft horsepower of the entire vessel's main propulsion machinery as determined by the manufacturer. This term is used when describing a vessel's propulsion power and also when placing limitations on an engineer officer license or endorsement. One horsepower equals 0.75 kW.

ILO means the International Labour Organization.

IMO means the International Maritime Organization.

Increase in scope means additional authority added to an existing credential, such as adding a new route or increasing the authorized horsepower or tonnage.

Inland waters means the navigable waters of the United States shoreward of the Boundary Lines as described in part 7 of this chapter, excluding the Great Lakes, and, for towing vessels, excluding the Western Rivers.

Integrated tug barge or ITB means any tug barge combination which, through the use of special design features or a specially designed connection system, has increased seakeeping capabilities relative to a tug and barge in the conventional pushing mode. An ITB can be divided into either a dual-mode ITB or a push-mode ITB. The definitions for those categories can be found elsewhere in this section.

Invalid credential means an MMC, MMD, license, STCW endorsement, or Certificate of Registry that has been suspended or revoked, has expired, has been tampered with, has not been signed, or has been superseded in accordance with § 10.205 of this part.

ISM means the International Safety Management Code.

Kilowatt or kW means 11⁄3 horsepower. This term is used when describing a vessel's propulsion power and also when placing limitations on an engineer officer license or endorsement.

Large passenger vessel, for the purposes of subpart H of part 12, and part 15, means a vessel of more than 70,000 gross tons, as measured under 46 U.S.C. 14302 and documented under the laws of the United States, with capacity for at least 2,000 passengers and a coastwise endorsement under 46 U.S.C. chapter 121.

Lifeboatman means a mariner who is qualified to take charge of, lower, and operate survival craft and related survival equipment on a vessel.

Lifeboatman-Limited means a mariner who is qualified to take charge of, lower, and operate liferafts, rescue boats, and other survival equipment on vessels where lifeboats are not installed.

Liquefied gas or LG means a cargo that has a vapor pressure of 172 kPa (25 psia) or more at 37.8 °C (100 °F).

Liquefied gas tanker means a tank vessel that is certificated to carry or carries liquefied gases in bulk as cargo or cargo residue. For the purposes of qualifying for an STCW endorsement for advanced liquefied gas tanker cargo operations, this includes tank barges.

Liquid cargo in bulk means a liquid or liquefied gas listed in § 153.40 of this chapter and carried as a liquid cargo or liquid-cargo residue in integral, fixed, or portable tanks, except a liquid cargo carried in a portable tank actually loaded and discharged from a vessel with the contents intact.

Management level means the level of responsibility associated with -

Marine chemist means a person certificated by the National Fire Protection Association as a marine chemist.

Master means the officer having command of a vessel.

Mate means a qualified officer in the deck department other than the master.

Medical Certificate means a certificate issued by the Coast Guard under 46 CFR part 10, subpart C that serves as proof that the seafarer meets the medical and physical standards for merchant mariners.

Merchant Mariner Credential or MMC means a 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.

MMC application means the application for the MMC, as well as the application for any endorsement on an MMC.

Mobile offshore drilling unit or MODU means a vessel capable of engaging in drilling operations for the exploration for or exploitation of subsea resources. MODU designs include the following:

Month means 30 days, for the purpose of complying with the service requirements of this subchapter.

National Driver Register or NDR means the nationwide repository of information on drivers maintained by the National Highway Traffic Safety Administration under 49 U.S.C. chapter 303.

National officer endorsement means an annotation on an MMC that allows a mariner to serve in the capacities listed in § 10.109(a) of this part. The officer endorsement serves as the license and/or certificate of registry pursuant to 46 U.S.C. subtitle II part E.

National rating endorsement means an annotation on an MMC that allows a mariner to serve in those capacities set out in § 10.109(b) and (c) of this part. The rating endorsement serves as the merchant mariner's document pursuant to 46 U.S.C. subtitle II part E.

NDR-listed convictions means a conviction of any of the following motor vehicle-related offenses or comparable offenses:

Near-coastal means ocean waters not more than 200 miles offshore from the U.S. and its possessions, except for MMCs endorsed as Operator of Uninspected Passenger Vessel for which near-coastal is limited to waters not more than 100 miles offshore from the U.S. and its possessions. This would also include those near-coastal waters identified by another Administration when the U.S. has entered into a treaty or an agreement with that country respecting the recognition of the U.S. near-coastal endorsement.

Non-resident alien, for the purposes of subchapter H of part 12, and part 15, means an individual who is not a citizen or alien lawfully admitted to the United States for permanent residence, but who is employable in the United States under the Immigration and Nationality Act (8 U.S.C. 1101 et seq.), including an alien crewman described in section 101(a)(15)(D)(i) of that Act who meets the requirements of 46 U.S.C. 8103(k)(3)(A).

Oceans means the waters seaward of the Boundary Lines as described in 46 CFR part 7. For the purposes of establishing sea service credit, the waters of the Inside Passage between Puget Sound and Cape Spencer, Alaska, and the inland waters of another country are not considered oceans.

Officer endorsement means an annotation on an MMC that allows a mariner to serve in the capacities listed in § 10.109 of this part.

Officer in Charge, Marine Inspection, or OCMI means, for the purposes of this subchapter, the commanding officer of the National Maritime Center, or any person designated as such by the Commandant, in accordance with 46 CFR 1.01-5(b).

Officer in charge of an engineering watch in a manned engine room or designated duty engineer in a periodically unmanned engine room (OICEW) means an engineering officer qualified at the operational level.

Officer in charge of a navigational watch (OICNW) means a deck officer qualified at the operational level.

Offshore installation manager or OIM means an officer restricted to service on MODUs. An assigned offshore installation manager is equivalent to a master on a conventional vessel and is the person designated by the owner or operator to be in complete and ultimate command of the unit.

Oil tanker means a tank vessel that is certificated to carry or carries oil in bulk as cargo or cargo residue. For the purposes of qualifying for an STCW endorsement for advanced oil tanker cargo operations, this includes tank barges.

On location means that a mobile offshore drilling unit is bottom bearing or moored with anchors placed in the drilling configuration.

Operate, operating, or operation (as applied to the manning requirements of vessels carrying passengers) refers to a vessel any time passengers are embarked whether the vessel is underway, at anchor, made fast to shore, or aground.

Operational level means the level of responsibility associated with -

Orally assisted examination means an examination as described in 46 CFR, part 11, subpart I of this subchapter administered orally and documented by a Coast Guard examiner.

Overriding operational condition means circumstances in which essential shipboard work cannot be delayed due to safety or environmental reasons, or could not have reasonably been anticipated at the commencement of the voyage.

Participation, when used with regard to the service on transfers required for tankerman by §§ 13.120, 13.203, or 13.303 of this chapter, means either actual participation in the transfers or close observation of how the transfers are conducted and supervised.

Passes a chemical test for dangerous drugs means that the result of a chemical test conducted according to 49 CFR part 40 is reported as “negative” by a Medical Review Officer according to that part.

Periodically unattended engine room means a space containing main propulsion and associated machinery and all sources of main electrical supply which is not at all times manned under all operating conditions, including maneuvering.

PIC means a person in charge.

Pilot of towing vessels means a qualified officer of a towing vessel operated only on inland routes.

Pilotage waters means the navigable waters of the United States, including all inland waters and offshore waters to a distance of 3 nautical miles from the baseline from which the Territorial Sea is measured.

Practical demonstration means the performance of an activity under the direct observation of a designated examiner or qualified assessor for the purpose of establishing that the performer is sufficiently proficient in a practical skill to meet a specified standard of competence or other objective criterion.

Propulsion power means the total maximum continuous-rated output power of the main propulsion machinery of a vessel determined by the manufacturer, in either kilowatts or horsepower, which appears on the ship's Certificate of Registry or other official document and excludes thrusters and other auxiliary machinery.

Public vessel means a vessel that -

Push-mode ITBs means those ITBs that involve a rigid coupling system and, when not coupled to the barge, are incapable of conducting towing in any other configuration (such as astern or alongside) because, by themselves, they have very limited seakeeping capability. The propelling unit moves as one with the barge unit.

Qualified Assessor or QA means a person who is qualified to evaluate, for STCW endorsements, whether an applicant has demonstrated the necessary level of competence in the task for which the assessment is being made. This person must be individually approved by the Coast Guard.

Qualified instructor means a person who has been trained in instructional techniques and is otherwise qualified to provide required training to candidates for an MMC endorsement. A faculty member employed at a State maritime academy or the U.S. Merchant Marine Academy operated under 46 CFR part 310 and instructing a course on merchant marine officer or rating knowledge, understanding, or proficiency requirements is qualified to serve as a qualified instructor in his or her area of specialization without individual evaluation by the Coast Guard.

Qualified rating means various categories of able seaman, qualified member of the engine department, or tankerman endorsements issued on MMCs.

Quality Standard System or QSS means a set of policies, procedures, processes, and data required to establish and fulfill the organization's objectives.

Raise of grade means an increase in the level of authority and responsibility associated with an officer or rating endorsement, such as from mate to master or second assistant engineer to first assistant engineer.

Rating endorsement is an annotation on an MMC that allows a mariner to serve in those capacities set out in § 10.109 of this part.

Regional examination center or REC means a field office of the National Maritime Center that receives and screens credential applications, conducts approved course oversight, and administers Coast Guard examinations as required by this subchapter.

Rest means a period of time during which the person concerned is off duty, is not performing work (which includes administrative tasks such as chart correction or preparation of port-entry documents), and is allowed to sleep without interruption.

Restricted tankerman endorsement means a valid tankerman endorsement on a merchant mariner credential restricting its holder as the Coast Guard deems appropriate. For instance, the endorsement may restrict the holder to one or a combination of the following: A specific cargo or cargoes; a specific vessel or vessels; a specific facility or facilities; a specific employer or employers; a specific activity or activities (such as loading or unloading in a cargo transfer); or a particular area of water.

Rivers means a river, canal, or other similar body of water designated as such by the Coast Guard.

Safe and suitable person means a person whose prior record, including but not limited to criminal record and/or NDR record, provides no information indicating that his or her character and habits of life would support the belief that permitting such a person to serve under the MMC and/or endorsement sought would clearly be a threat to the safety and security of life or property, detrimental to good discipline, or adverse to the interests of the United States. See 46 CFR 10.211 and 10.213 for the regulations associated with this definition.

Seagoing service means service onboard a ship/vessel relevant to the issue of a credential or other qualification.

Seagoing vessel means a ship that operates beyond the boundary line specified in 46 CFR part 7.

Second engineer officer means an engineer officer next in rank to the chief engineer officer and upon whom the responsibility for the mechanical propulsion and the operation and maintenance of the mechanical and electrical installations of the ship will fall in the event of the incapacity of the chief engineer officer.

Self propelled has the same meaning as the terms “propelled by machinery” and “mechanically propelled.” This term includes vessels fitted with both sails and mechanical propulsion.

Senior company official means the president, vice president, vice president for personnel, personnel director, or similarly titled or responsible individual, or another employee designated in writing by one of these individuals for the purpose of certifying employment.

Service (as used when computing the required service for endorsements) means the time period, in days, a person is assigned to work. On MODUs, this excludes time spent ashore as part of crew rotation.

Ship means a vessel using any mode of propulsion, including sail and auxiliary sail.

Simulated transfer means a transfer practiced in a course meeting the requirements of § 13.121 of this subchapter that uses simulation to meet part of the service on transfers required for tankerman by §§ 13.203 or 13.303 of this subchapter.

Staff officer means a person who holds an MMC with an officer endorsement listed in § 10.109(a)(36) through (a)(43) of this part.

Standard of competence means the level of proficiency to be achieved for the proper performance of duties onboard vessels according to national and international criteria.

Steward's department means the department that includes entertainment personnel and all service personnel, including wait staff, housekeeping staff, and galley workers, as defined in the vessel security plan approved by the Secretary under 46 U.S.C. 70103(c). These personnel may also be referred to as members of the hotel department on a large passenger vessel.

STCW means the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers, 1978, as amended (incorporated by reference, see § 10.103 of this subpart).

STCW Code means the Seafarers' Training, Certification and Watchkeeping Code (incorporated by reference, see § 10.103 of this subpart).

STCW endorsement means an annotation on an MMC that allows a mariner to serve in those capacities under § 10.109(d) of this subpart. The STCW endorsement serves as evidence that a mariner has met the requirements of the STCW Convention.

Support level means the level of responsibility associated with performing assigned tasks, duties, or responsibilities onboard a seagoing ship under the direction of an individual serving in the operational or management level.

Tank barge means a non-self-propelled tank vessel.

Tank vessel means a vessel that is constructed or adapted to carry, or that carries, oil or hazardous material in bulk as cargo or cargo residue, and that -

Tankerman assistant means a person holding a valid “Tankerman-Assistant” endorsement on his or her MMC. See 46 CFR, part 13, subpart D.

Tankerman engineer means a person holding a valid “Tankerman-Engineer” endorsement on his or her MMC. See 46 CFR part 13, subpart E.

Tankerman PIC means a person holding a valid “Tankerman-PIC” endorsement on his or her MMC. See 46 CFR part 13, subpart B.

Tankerman PIC (Barge) means a person holding a valid “Tankerman-PIC (Barge)” endorsement on his or her MMC. See 46 CFR part 13, subpart C.

Tankship means any self-propelled tank vessel constructed or adapted primarily to carry oil or hazardous material in bulk as cargo or as cargo residue.

Training program means a combination of training, practical assessment, and service which provides an individual with all or part of the necessary knowledge, understanding, and proficiency required for a specific qualification.

Transfer means any movement of fuel, dangerous liquid, or liquefied gas as cargo in bulk or as cargo residue to or from a vessel by means of pumping, gravitation, or displacement.

Transportation Worker Identification Credential or TWIC means an identification credential issued by the Transportation Security Administration under 49 CFR part 1572.

Underway means that a vessel is not at anchor, made fast to the shore, or aground. When referring to a mobile offshore drilling unit (MODU), underway means that the MODU is not in an on-location or laid-up status and includes that period of time when the MODU is deploying or recovering its mooring system.

Undocumented vessel means a vessel not required to have a certificate of documentation issued under the laws of the United States.

Unlimited means an annotation on an MMC authorizing service on vessels of any tonnage or any propulsion power.

Vessel personnel with designated security duties means a person, excluding the designated security officer (e.g., Company Security Officer (CSO), as defined in 33 CFR chapter I, subchapter H, and Vessel Security Officer (VSO)), having specific security duties and responsibilities in accordance with the ship security plan.

Vessel Security Officer (VSO) means a person onboard the vessel accountable to the Master and designated by the Company as responsible for security of the vessel, including implementation and maintenance of the Vessel's Security Plan, and for liaison with the Facility Security Officer and the vessel's Company Security Officer.

Western Rivers means -

Year means 360 days for the purpose of complying with the service requirements of this subchapter.