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USCG National Maritime Center (NMC) Exam Bank

US Coast Guard (USCG) Examination Questions & Practice Tests

Practice authentic US Coast Guard (USCG) examination questions and license practice tests across all ratings. Prepare for your OUPV 6-Pack Captain's License, 100-Ton Master, Deck Officer, and Engineering exams with 46 CFR and COLREGS rule citations, official diagrams, and interactive test simulation. 100% free with zero paywalls.

22,846 Total Questions
25 Exam Modules
90% ROR Pass Benchmark
70% Standard Passing Grade
Free & Open Access
Popular Credential Track

OUPV (6-Pack) Captain's License Practice Tests

Preparing for your Six-Pack Captain's License? Practice authentic US Coast Guard examination questions organized specifically for the 4 core OUPV modules: Rules of the Road (90% pass), Chart Plotting & Navigation Problems (90% pass), Navigation General, and Deck General & Safety.

Rules of the Road (90%) Navigation Problems (90%) General Navigation (70%) Deck Safety & General (70%)
Open OUPV 6-Pack Hub Complete 4-module study guide

Deck Officer & Rating Modules

Rules of the Road, Terrestrial Piloting, Celestial Sight Reduction, Ship Stability, and Seamanship

11 Modules • 14,180 Qs
35 Sets (1,025 Qs)
ROR • Pass: 90% (27/30)

Rules of the Road

COLREGS 1972 & US Inland Rules, lights, shapes, sound signals, and navigation safety.

Launch Practice Room
170 Sets (5,076 Qs)
DG • Pass: 70% (21/30)

Deck General

Ship construction, cargo handling, seamanship, anchoring, firefighting, and maritime law.

Launch Practice Room
95 Sets (2,841 Qs)
SAFETY • Pass: 70% (21/30)

Safety & Environmental Protection (Deck)

SOLAS lifesaving appliances, MARPOL compliance, stability, damage control, and emergency response.

Launch Practice Room
72 Sets (2,138 Qs)
GENNAV • Pass: 70% (21/30)

General Navigation

Chart reading, tides, currents, compass magnetism, buoyage systems, and marine meteorology.

Launch Practice Room
57 Sets (1,708 Qs)
NAVPROB • Pass: 70% (21/30)

Navigation Problems

Celestial navigation sights, compass corrections, plotting sheet fixes, and tidal height calculations.

Launch Practice Room
19 Sets (541 Qs)
DG-SUPP • Pass: 70%

Deck General (Supplementary)

Supplementary USCG Deck General questions and operational scenarios.

Launch Practice Room
9 Sets (267 Qs)
ROR-SUPP • Pass: 90%

Deck Rules (Supplementary)

Supplementary Rules of the Road meeting, crossing, and overtaking scenarios.

Launch Practice Room
7 Sets (199 Qs)
SAFETY-SUPP • Pass: 70%

Deck Safety (Supplementary)

Supplementary emergency and damage control deck safety questions.

Launch Practice Room
5 Sets (146 Qs)
NAV-SUPP • Pass: 70%

Deck Navigation (Supplementary)

Supplementary piloting, buoyage, and navigational mathematics.

Launch Practice Room
5 Sets (133 Qs)
MISC • Pass: 70%

Deck Misc (Supplementary)

Miscellaneous merchant mariner deck licensing questions.

Launch Practice Room
4 Sets (106 Qs)
CMA-DECK • Pass: 70%

California Maritime Academy (CMA) Deck

CMA training ship deck evolutions, bridge watchkeeping, and port operations.

Launch Practice Room

Engineering Officer & Rating Modules

Diesel Motor Plants, Steam Boilers & Turbines, Marine Electrical, Auxiliaries, Refrigeration, and Gas Turbines

13 Modules • 8,066 Qs
47 Sets (1,386 Qs)
ELEC • Pass: 70% (21/30)

Marine Electrical Systems

3-phase AC generation, circuit breakers, generator paralleling, motor controllers, and DC systems.

Launch Practice Room
38 Sets (1,128 Qs)
GEN-ENG • Pass: 70% (21/30)

General Subjects (Auxiliaries & Systems)

Centrifugal pumps, positive displacement pumps, marine refrigeration, air compressors, and hydraulics.

Launch Practice Room
32 Sets (947 Qs)
MOTOR • Pass: 70% (21/30)

Motor Plants & Auxiliary Boilers

Two-stroke and four-stroke marine diesel engines, fuel injection systems, lubrication, and turbocharging.

Launch Practice Room
28 Sets (811 Qs)
STEAM • Pass: 70% (21/30)

Steam Plants (Boilers & Turbines)

Water-tube boilers, steam turbines, feed cycles, water chemistry, and boiler safeties.

Launch Practice Room
21 Sets (610 Qs)
REFRIG • Pass: 70% (21/30)

Refrigeration & Air Conditioning

Vapour compression cycles, refrigerants, expansion valves, evaporators, and HVAC plant operations.

Launch Practice Room
33 Sets (968 Qs)
SAFETY-ENG • Pass: 70% (21/30)

Engineering Safety & Environmental Protection

Fixed firefighting systems, enclosed space gas detection, oil water separators (OWS), and MARPOL Annex I/VI.

Launch Practice Room
10 Sets (277 Qs)
GAS-TURB • Pass: 70% (21/30)

Gas Turbines

Marine gas turbine Brayton cycle, compressor staging, combustor liners, and turbine control systems.

Launch Practice Room
30 Sets (881 Qs)
GEN-ENG-SUPP • Pass: 70%

Engine General (Supplementary)

Supplementary marine engineering auxiliary and machinery questions.

Launch Practice Room
12 Sets (354 Qs)
SAFETY-ENG-SUPP • Pass: 70%

Engine Safety (Supplementary)

Supplementary machinery space fire safety and pollution prevention.

Launch Practice Room
10 Sets (275 Qs)
PLANTS-SUPP • Pass: 70%

Engine Plants (Supplementary)

Supplementary propulsion plant troubleshooting and operations.

Launch Practice Room
9 Sets (252 Qs)
REFRIG-SUPP • Pass: 70%

Engine Refrigeration (Supplementary)

Supplementary provisions and cargo refrigeration systems questions.

Launch Practice Room
6 Sets (176 Qs)
GAS-TURB-SUPP • Pass: 70%

Engine Gas Turbines (Supplementary)

Supplementary aero-derivative marine gas turbine operations.

Launch Practice Room
1 Sets (1 Qs)
ENG-MISC • Pass: 70%

Engine Misc (Supplementary)

Supplementary marine engineering calculations and principles.

Launch Practice Room

GMDSS & Maritime Radio Communications

Global Maritime Distress and Safety System radio operator licensing questions and operational protocols

1 Module • 600 Qs
20 Sets (600 Qs)
GMDSS-7 • Pass: 75%

GMDSS Element 7 (Radio Operating Practices)

FCC/USCG commercial GMDSS radio maintainer and operator operating practices.

Launch Practice Room

Looking for STCW & DG Shipping Modular Exit Exams?

Practice EFA, FPFF, PST, PSSR, TASCO, AFF, MFA, and 20+ STCW mandatory modular courses.

Visit STCW Exit Exam Portal

Frequently Asked Questions

Common questions regarding USCG National Maritime Center examinations and scoring criteria.

What is the USCG Merchant Mariner Credential (MMC) Exam?
The USCG MMC Examination is administered by the National Maritime Center (NMC) to test mariners seeking Deck Officer (OUPV, 100 Ton Master, Mate, Chief Mate, Master Unlimited), Engine Officer/Rating (QMED, DDE, Assistant Engineer, Chief Engineer), and GMDSS Radio Operator licenses under Title 46 Code of Federal Regulations (46 CFR).
Does BrightMariner have practice tests for the OUPV 6-Pack Captain's License?
Yes. BrightMariner covers all 4 examination modules required for the OUPV (Operator of Uninspected Passenger Vessels / 6-Pack) Captain's License: Rules of the Road (30 questions, 90% passing score), Navigation Problems / Chart Plotting (10 questions, 90% passing score), General Navigation (50 questions, 70% passing score), and Deck General & Safety (60 questions, 70% passing score). Explore our dedicated OUPV 6-Pack Practice Test portal.
What is the passing score for USCG Deck and Engineering exams?
Under NMC testing guidelines, Rules of the Road (ROR) requires a minimum passing score of 90% (at least 27 correct out of 30 questions). GMDSS Element 7 requires 75%, and most other Deck and Engineering modules require a 70% passing score (21 correct out of 30 questions).
How many questions and modules are available in the BrightMariner USCG question bank?
Bright Mariner provides a complete, free database of 22,846 verified USCG examination questions across 25 comprehensive modules, including Rules of the Road, Deck General, General Navigation, Navigation Problems, Deck Safety, Marine Electrical Systems, General Subjects, Motor Plants & Auxiliary Boilers, Steam Plants, Refrigeration & HVAC, Engineering Safety, Gas Turbines, and GMDSS Element 7.
Are question explanations tailored to 46 CFR, COLREGS, and Bowditch standards?
Yes, every question explanation cites applicable international and inland navigation rules (COLREGS 1972 / 33 CFR 83), Title 46 Code of Federal Regulations (46 CFR), Bowditch celestial/piloting methods, or standard marine engineering thermodynamics.
Is BrightMariner completely free compared to other USCG exam prep websites?
Yes, 100% free with no paywalls or subscription fees. While other exam sites restrict full access behind monthly fees, all 22,846 questions, interactive practice rooms, diagrams, and answer explanations on BrightMariner are completely accessible for all mariners.