Passenger Vessel Licensing for the USCG Exam

Statutory Definitions: 46 USC 2101

The definitions in 46 USC 2101 are foundational. The exam tests these repeatedly because they determine which regulations apply, what license is required, and whether a vessel must be inspected. Know every definition cold.

Passenger (46 USC 2101(21a))

A passenger is an individual carried on the vessel other than the master or a crew member. This is broader than most people assume. Even a person who is not paying but is being carried aboard counts as a passenger for purposes of headcount. The distinction between a passenger and a crew member matters for lifesaving equipment calculations, manning requirements, and liability exposure.

Passenger for Hire (46 USC 2101(21b))

A passenger for hire is a passenger for whose transportation a charge is made. The word "charge" is interpreted broadly. It includes money, goods, services, or anything of value received by the owner, operator, or any other person in exchange for carrying that passenger. Indirect arrangements — tips, bundled packages, club memberships, fishing tournament entry fees — can all trigger "for hire" status. When in doubt, assume the USCG will find consideration.

Passenger Vessel (46 USC 2101(22))

A passenger vessel is defined as:

• A vessel of at least 100 gross tons carrying more than 12 passengers, including at least one passenger for hire; or
• A vessel of less than 100 gross tons carrying more than 6 passengers for hire.

This definition triggers the full passenger vessel inspection regime under Title 46 and means the vessel must hold a Certificate of Inspection. Vessels that do not meet this threshold — specifically those carrying 6 or fewer passengers for hire — fall under the uninspected passenger vessel framework.

Small Passenger Vessel (46 USC 2101(35))

A small passenger vessel is a passenger vessel of less than 100 gross tons. This category is critical because it defines the scope of 46 CFR Subchapter T. Small passenger vessels include everything from 25-foot fishing boats carrying 8 paying clients to 80-foot dinner cruise vessels — so long as they are under 100 GRT and carry more than 6 passengers for hire.

Uninspected Passenger Vessel (46 USC 2101(42) and 46 USC 2101(43))

An uninspected passenger vessel (UPV) is a vessel that carries not more than 6 passengers for hire. UPVs are not subject to the full USCG inspection scheme. They are governed instead by 46 CFR Part 26 (Safety Equipment for UPVs). An operator of a UPV must hold at minimum an OUPV (Operator of Uninspected Passenger Vessel) license. The moment a seventh paying passenger boards, the vessel is no longer a UPV — it is an inspected passenger vessel and must hold a COI.

The 6-Pack Rule and OUPV Licensing

The "6-pack rule" is the most frequently tested licensing concept in USCG captain's exam preparation. It refers to the maximum of 6 passengers for hire that can be carried on an uninspected vessel by an OUPV-licensed operator. Understanding every dimension of this rule — what it covers, what it does not cover, and the geographic limitations it imposes — is essential.

What an OUPV License Authorizes

An OUPV license authorizes the holder to operate uninspected passenger vessels carrying not more than 6 passengers for hire on the waters within the geographic scope of the license. The OUPV is not a tonnage license — it is a license tied to the uninspected vessel category. The license does not authorize operation of inspected vessels (vessels required to hold a COI).

Geographic Scope: Near Coastal vs. Inland

OUPV licenses come in two geographic flavors:

• OUPV Near Coastal: Authorizes operation on inland waters and on near coastal waters not more than 100 nautical miles from a harbor of safe refuge. This is the standard charter captain license for offshore fishing, coastal cruising, and similar operations.
• OUPV Inland: Authorizes operation on inland waters only — rivers, lakes, bays, sounds, and other protected waters. Does not authorize offshore operations.

The OUPV Does NOT Authorize

• Carrying 7 or more passengers for hire under any circumstances
• Operating an inspected vessel (one required to hold a COI)
• Operating as master of a vessel 100 GRT or larger
• Operating beyond 100 miles offshore on Near Coastal license
• Towing for compensation (requires a separate towing endorsement)

The Critical Threshold: 6 vs. 7

Non-Paying Passengers and the Headcount

Non-paying guests may be aboard in addition to the 6 passengers for hire without triggering the 7-passenger limit — but only if they are genuinely not paying and there is no indirect consideration. The USCG scrutinizes arrangements where some passengers "pay" and others claim to be guests, particularly when the pattern repeats. Friends and family who receive no direct or indirect benefit from the trip can be aboard without counting toward the for-hire limit, but the operator bears the burden of proof.

Master License and Tonnage Thresholds

When a vessel carries 7 or more passengers for hire, or when the operator wishes to command inspected vessels, an OUPV is not sufficient. A Master license of appropriate tonnage is required. Master licenses are issued by tonnage ratings, and the tonnage rating of the license must equal or exceed the gross registered tonnage (GRT) of the vessel being operated.

Common Master License Ratings

The 100 GRT Boundary

The 100 gross ton boundary is one of the most significant thresholds in maritime law. Below 100 GRT, small passenger vessels are governed by 46 CFR Subchapter T. At 100 GRT and above, the applicable subchapter changes to Subchapter K for small passenger vessels or Subchapter H for larger passenger vessels. The licensing requirements, inspection standards, lifesaving equipment requirements, and manning rules all change at this threshold. The exam regularly tests which subchapter applies based on a vessel's tonnage and passenger count.

Tonnage Measurement Basics

Gross tonnage (GT) is a measure of a vessel's enclosed volume, not its weight. One gross ton equals 100 cubic feet of enclosed space. Gross registered tonnage (GRT) is calculated using the formula set by the ITC 69 tonnage convention or older methods for pre-convention vessels. For licensing and regulatory purposes, the GRT on the vessel's documentation certificate is the controlling figure. Operators approaching the 100 GRT threshold sometimes pursue a tonnage admeasurement review to confirm the vessel's classification.

46 CFR Subchapter T: The T-Boat Rules

46 CFR Subchapter T (Parts 175 through 185) is the primary regulatory framework for small passenger vessels — those under 100 gross tons carrying more than 6 passengers for hire on domestic voyages. These vessels are commonly called "T-boats" by the industry because of the subchapter designation. Subchapter T comprehensively governs every aspect of T-boat operations.

Structure of Subchapter T

Applicability Exceptions

Not every vessel carrying 7+ passengers for hire falls under Subchapter T. Exceptions include: vessels on international voyages (which fall under SOLAS), certain government vessels, vessels operating exclusively on lakes or rivers in a single state where federal jurisdiction is limited, and vessels carrying only scientists or researchers in specific conditions. The exam may test whether Subchapter T applies to a given scenario, so read the fact pattern carefully for international voyage indicators.

Certificate of Inspection (COI)

The Certificate of Inspection is the operating authority for every inspected passenger vessel. Without a valid, current COI, a vessel carrying more than 6 passengers for hire is operating in violation of federal law. The COI is issued by the USCG Marine Safety Office (MSO) following successful completion of an annual inspection.

Contents of the COI

The COI is a detailed document. It specifies:

• Authorized route: The geographic waters the vessel may operate on (Oceans, Coastwise, Limited Coastwise, Lakes/Bays/Sounds, Rivers)
• Maximum persons: The total number of persons (passengers plus crew) authorized to be aboard
• Minimum manning: The minimum number and grade of licensed officers and crew required
• Lifesaving equipment: Number and type of PFDs, ring buoys, liferafts, EPIRBs, and other required equipment
• Fire equipment: Fixed and portable extinguishing systems required
• Vessel identification: Official number, hull ID, vessel name, and owner information
• Expiration date: COIs are typically valid for one year and must be renewed following annual inspection
• Special conditions: Any operational restrictions unique to that vessel

Posting Requirement

Under 46 CFR 176.900, the COI must be posted in a prominent and accessible location aboard the vessel at all times when the vessel is in operation. This is not optional. A USCG boarding officer will check for the posted COI. Failure to display the COI is an independent violation, separate from any compliance issues with the COI's terms.

Annual Inspection Process

Renewal of the COI requires an annual inspection by USCG personnel. The inspection covers the vessel's hull, machinery spaces, electrical systems, fire protection equipment, lifesaving equipment, navigation equipment, and structural integrity. The operator must present the vessel in full compliance. Any deficiencies identified during inspection must be corrected before the COI is renewed or the vessel returns to passenger-carrying service.

Consequences of COI Violations

Passenger Capacity Limits and Calculations

The maximum number of passengers authorized by the COI is not arbitrary — it is calculated based on multiple limiting factors, and the smallest number controls. Understanding the calculation methodology is testable on the exam.

The Five Limiting Factors

Under 46 CFR 176.113, passenger capacity is limited by whichever of the following calculations produces the smallest number:

Capacity Calculation Example

Stability Letter Requirements

A stability letter is a formal document prepared by a naval architect and accepted by the USCG that certifies a vessel's intact stability meets minimum standards for its intended route and loading conditions. It is a prerequisite for obtaining or renewing a COI for most small passenger vessels.

What the Stability Letter Covers

• Maximum gross weight of passengers: Establishes how many pounds of passenger weight the vessel can safely carry at each loading condition
• Maximum persons allowed on board: Derived from the weight limits using an assumed weight per person (typically 160 to 185 lbs depending on voyage type)
• Loading distribution requirements: Specifies whether passengers must be distributed across the vessel or whether concentrated aft or forward loading is restricted
• Route restrictions: Some stability letters are valid only in protected waters; offshore routes require more stringent stability criteria
• Operational restrictions: Conditions like maximum wind speed or wave height beyond which the vessel must not operate

Inclining Experiment

The inclining experiment is the method used to determine a vessel's stability characteristics. A known weight is moved a known transverse distance, and the resulting list angle is measured. From this, the naval architect calculates the metacentric height (GM), which is the primary indicator of initial stability. Vessels with positive GM are initially stable; a negative GM indicates the vessel will capsize. Subchapter T requires that passenger vessels maintain adequate GM across all loading conditions specified in the stability letter.

Keeping the Stability Letter Current

The stability letter must reflect the vessel's current condition. Modifications to the hull, addition of permanent equipment above the waterline, changes to passenger area configuration, or installation of new machinery can alter the vessel's center of gravity and invalidate the existing stability letter. Operators must notify the USCG and potentially conduct a new inclining experiment or stability calculation when significant modifications occur.

Route Designations and Geographic Restrictions

Both OUPV licenses and COIs carry geographic restrictions that determine where operations are authorized. These restrictions are among the most commonly tested licensing topics on the USCG exam. The route hierarchy runs from most restricted to least restricted.

License Route Designations

COI Route Designations (Inspected Vessels)

Inspected vs. Uninspected Vessels: The Key Distinction

The distinction between inspected and uninspected passenger vessels controls which regulatory framework applies, which license is required, and what equipment must be carried. The exam tests this distinction from multiple angles. Know it thoroughly.

Charter Boat Operations: Headboats vs. Charterboats

The commercial passenger vessel industry uses two primary business models: the headboat (party boat) and the charterboat (private charter). These terms describe the commercial arrangement more than the regulatory category, but understanding both is important for the exam and for real-world operations.

Headboats (Party Boats)

A headboat charges each passenger individually — per head — for a shared trip. Typical headboat operations include:

• Offshore fishing trips where 20 to 100+ passengers pay individually
• Whale watching or sightseeing cruises with open public ticketing
• Dive boats charging per diver for tank and transportation
• Dinner or sunset cruise vessels with per-person ticket sales

Headboats virtually always carry more than 6 passengers for hire, which means they are inspected passenger vessels requiring a COI and a licensed Master. The Master must hold a license of appropriate tonnage for the vessel. Deck crew requirements are specified on the COI.

Charterboats (Private Charters)

A charterboat is typically hired by a single party — the entire vessel is chartered at one price for a private group. The licensing implications depend entirely on how many passengers are being carried for hire:

• 6 or fewer paying passengers: The vessel qualifies as an uninspected passenger vessel. The operator needs an OUPV license. No COI required. This is the classic "6-pack" charter boat operation.
• 7 or more paying passengers: Even on a private charter, carrying 7+ passengers for hire converts the vessel to an inspected passenger vessel requiring a COI and a licensed Master.

Manning Requirements for Passenger Vessels

Manning requirements — the minimum number and qualification of crew needed to operate a vessel lawfully — are specified on the COI for inspected vessels and in 46 CFR Part 15 for general requirements. These requirements are calculated based on vessel size, route, passenger count, and operational hours.

Minimum Manning Under Subchapter T

Under 46 CFR 185.710, the minimum crew for a T-boat is established by the COI. The USCG determines minimum manning based on the following factors:

• Number of passengers authorized
• Length and type of voyage (day trip vs. overnight)
• Route (inland, near coastal, oceans)
• Vessel size and complexity
• Whether an engineer or mate is required

Watchstanding Requirements

Vessels operating on overnight voyages or on routes requiring continuous watch must maintain a proper lookout at all times as required by the COLREGS and Inland Navigation Rules. A licensed officer must be on watch whenever the vessel is underway with passengers aboard. The master cannot serve as the sole licensed officer on an extended overnight passage if continuous watch requirements cannot be maintained safely by one person.

Crew Qualifications

All unlicensed crew aboard inspected passenger vessels may be required to hold certain USCG endorsements depending on the vessel's route and COI requirements:

• Able Seaman (AB) endorsement for certain crew positions on larger vessels
• STCW Basic Safety Training for vessels on international voyages
• TWIC (Transportation Worker Identification Credential) for vessels calling at regulated facilities
• First aid and CPR certification (often required by state law or COI conditions)

Lifesaving Equipment: Liferafts, Lifeboats, and PFDs

Lifesaving equipment requirements under 46 CFR Part 180 are among the most heavily tested areas of the T-boat examination. The requirements differ based on route designation, vessel size, and the number of persons aboard.

Personal Flotation Devices (PFDs)

Under 46 CFR 180.64, inspected passenger vessels must carry USCG-approved PFDs as follows:

• One Type I, II, or III PFD for every person authorized to be aboard
• Type IV throwable devices (ring buoys or cushions) required in addition to wearable PFDs
• Accessible stowage: PFDs must not be stored in locked compartments or in locations inaccessible during an emergency
• Children's PFDs: Properly sized PFDs must be available for all children aboard; the COI may specify quantities

Liferaft Requirements

Liferaft requirements under 46 CFR 180.200 apply to small passenger vessels on routes beyond the Boundary Line (generally beyond protected waters):

Liferaft vs. Lifeboat

A liferaft is an inflatable or rigid survival craft that must be manually or automatically deployed. Most T-boats carry inflatable liferafts in canister form. A lifeboat is a rigid survival craft typically permanently mounted and launched via davits — more common on larger vessels (Subchapter K and H). For T-boats under Subchapter T, inflatable liferafts are the standard requirement. They must be USCG-approved, inspected annually by an approved service station, and stowed in a hydrostatic release unit (HRU) that automatically releases the raft if the vessel sinks.

Distress Signals and EPIRBs

T-boats operating beyond coastal waters must carry visual distress signals (VDS) including red hand-held flares, orange smoke signals, and parachute flares appropriate for the route. An EPIRB (Emergency Position Indicating Radio Beacon) is required for vessels operating on Oceans and Coastwise routes. Category I EPIRBs are automatically activated upon immersion; Category II require manual activation. The EPIRB must be registered with NOAA and tested according to manufacturer specifications. EPIRBs must be mounted in a bracket allowing float-free deployment.

Passenger Muster Requirements

Under 46 CFR 185.506, the operator of a T-boat must conduct a safety orientation for all passengers before or immediately after departure. This is commonly called the passenger muster or safety briefing. Failure to conduct the briefing is an independent regulatory violation and becomes critical evidence in any liability action following an accident.

Required Briefing Elements

The safety briefing must cover the following at minimum:

Logbook Documentation

The master must record in the official logbook that a passenger safety orientation was conducted before or immediately after departure. The logbook entry should include the date, time of departure, number of passengers aboard, and confirmation that the briefing was completed. For overnight voyages, a full muster drill with passengers at their assigned stations is required and must also be logged.

Fire Safety Requirements for Passenger Vessels

Fire is the most dangerous emergency aboard a passenger vessel. Unlike a sinking, which provides time for orderly abandonment, fire can disable a vessel and injure or kill passengers within minutes. 46 CFR Part 181 governs fire protection for T-boats comprehensively.

Fixed Fire Extinguishing Systems

Enclosed machinery spaces — engine rooms, generator rooms, and similar spaces — must be protected by fixed fire extinguishing systems on vessels over a specified size or power. Common systems include CO2 (carbon dioxide) flooding systems, dry chemical systems, and clean agent systems. These systems must be capable of suppressing a fire in the protected space without crew entry. The system must be inspected annually by a certified technician.

Portable Fire Extinguishers

Portable fire extinguishers must be USCG-approved and distributed throughout the vessel according to 46 CFR 181.400. The type and quantity are specified on the COI. Extinguishers must be inspected and tagged annually. Common classifications for marine use:

• B-I: Fights liquid fires; minimum for enclosed engine spaces on small vessels
• B-II: Larger capacity; required in machinery spaces on larger T-boats
• Type ABC: Multi-purpose dry chemical; effective on most marine fire types

Fire Detection Systems

Under 46 CFR 181.300, T-boats must have approved fire detection systems in enclosed machinery spaces. Detection systems must be capable of sounding an alarm audible throughout the vessel. Some COI conditions require smoke detectors in accommodation spaces, galley areas, and passenger salons on overnight vessels.

Fuel System Safety

Gasoline-powered passenger vessels present special fire and explosion hazards. Under 46 CFR Part 182, fuel systems must include: vapor-proof fuel tanks in vented compartments, Coast Guard-approved fuel lines, anti-siphon valves, and blower systems capable of ventilating fuel compartments before engine start. Diesel fuel systems are significantly less volatile but must still meet 46 CFR standards for fuel line routing, shut-off valves, and tank venting.

Safety Management Systems (SMS)

A Safety Management System (SMS) is a documented, systematic approach to managing vessel safety that assigns responsibilities, establishes procedures for safe operation and emergency response, and creates a framework for continuous improvement. While SMS is mandatory under the International Safety Management (ISM) Code for large international vessels, the USCG strongly encourages SMS adoption for domestic passenger vessel operators and it is increasingly expected in the industry.

ISM Code (International Vessels)

The ISM Code, adopted under SOLAS Chapter IX, is mandatory for vessels on international voyages of 500 GRT and over. It requires the shipping company to hold a Document of Compliance (DOC) and each vessel to hold a Safety Management Certificate (SMC). The ISM Code is outside the scope of most OUPV and Master 100 GRT candidates, but the exam may test familiarity with its existence and applicability.

Domestic SMS for Passenger Vessels

For domestic T-boat operators, a voluntary SMS typically includes:

• A safety policy signed by the company owner or chief executive
• Documented operating procedures for routine vessel operations
• Emergency procedures for fire, flooding, man overboard, grounding, and medical emergencies
• Crew training records and qualification verification
• Maintenance schedules for critical safety equipment
• An incident reporting and near-miss reporting system
• Regular internal safety audits and reviews

SMS and Liability

Beyond regulatory compliance, an SMS provides critical documentation in the event of a marine casualty. Operators who can demonstrate that their vessel was operated according to a documented safety management system — with trained crew following established procedures — are in a significantly better position in post-accident investigations and civil litigation than operators who relied on informal, undocumented practices.

Vessel Documentation for Passenger Operations

Passenger vessel operators must understand both federal documentation requirements and the additional documentation specific to carrying passengers commercially. The documentation requirements for passenger vessels are more extensive than for recreational vessels.

Certificate of Documentation

Vessels 5 net tons and over used in the coastwise trade (including carrying passengers for hire between US ports) must be documented with the USCG National Vessel Documentation Center (NVDC) under 46 USC Chapter 121. The Certificate of Documentation specifies the vessel's trade endorsement. A vessel carrying passengers for hire on domestic routes must have a Coastwise endorsement. Documentation also establishes US citizenship of the owner, which is required for coastwise trade under the Jones Act (46 USC 55103).

Required Documents Aboard an Inspected Passenger Vessel

A properly equipped inspected passenger vessel should carry:

• Certificate of Inspection (posted conspicuously)
• Certificate of Documentation
• Stability letter
• Logbook (official, permanently bound)
• Navigation charts for the route
• Radio station license (from FCC)
• Operator's license (and any mates' licenses as required by COI)
• Fire extinguisher and liferaft inspection tags
• Drug testing program records (if operating under DOT/USCG drug testing rules)

Logbook Requirements

Under 46 CFR 185.215, inspected passenger vessels must maintain an official logbook. Required entries include: date and port of departure and arrival; number of passengers carried; any accidents, injuries, or deaths; safety orientation completion; crew changes; and equipment failures. The logbook is a legal document and falsifying entries is a federal crime.

Exam Strategy: How Passenger Licensing Is Tested

Passenger vessel licensing questions on the USCG exam follow predictable patterns. Understanding these patterns lets you approach questions systematically rather than relying on memorization alone.

Common Question Types

High-Frequency Exam Topics

Frequently Asked Questions

Related Study Topics