Overview: What the USCG Exam Actually Tests
The USCG captain's license exam is not a single test — it's a series of subject-area modules administered by your Regional Examination Center (REC). Each module covers a specific body of maritime knowledge, and each has its own passing threshold. You must pass each module to receive your credential.
The structure varies slightly by license level, but for the OUPV and 100-Ton Near Coastal exams — the two most common starting points — here's what you're looking at.
OUPV (6-Pak) Exam: 60 Questions, 70 Minutes
The OUPV exam covers 7 primary subject areas. Question distribution is approximately:
- Rules of the Road (COLREGS): 12 questions — must pass at 90%
- Deck General: 10 questions
- Navigation General: 10 questions
- Tides, Currents, and Weather: 8 questions
- Seamanship: 8 questions
- Safety: 6 questions
- Federal Requirements: 6 questions
All sections except Rules of the Road require 70% to pass. Rules of the Road requires 90%.
100-Ton Near Coastal Exam: 120 Questions, 150 Minutes
The 100-Ton exam covers 8 subject areas with more depth in navigation and engineering:
- Rules of the Road (COLREGS): 20 questions — must pass at 90%
- Deck General: 15 questions
- Navigation General: 20 questions
- Navigation Problems (chart work): 15 questions
- Tides, Currents, and Weather: 15 questions
- Seamanship: 15 questions
- Safety: 10 questions
- Federal Requirements: 10 questions
Section 1: Rules of the Road (COLREGS) — The 90% Section
This is the most important section and the one most students underestimate. You need 90% — that means you can miss at most one or two questions on the OUPV (12 questions) and two questions on the 100-Ton (20 questions).
COLREGS covers the International Regulations for Preventing Collisions at Sea plus the Inland Navigation Rules. Key areas:
- Vessel hierarchy (who gives way to whom under Rule 18)
- Crossing, overtaking, and head-on situations (Rules 13-17)
- Navigation light configurations and arc degrees for all vessel types
- Day shapes and their meanings
- Sound signals in restricted visibility and maneuvering signals
- Narrow channels and traffic separation schemes
- Differences between International and Inland Rules
Spend more time on COLREGS than any other section. It has the highest stakes and rewards focused study.
Section 2: Navigation General
Navigation General covers the fundamentals of maritime navigation:
- Chart reading: symbols, depths, compass roses, scales
- Plotting courses and positions
- Magnetic variation and compass deviation — correcting from compass to true and back
- Dead reckoning: calculating position based on course, speed, and time
- Aids to navigation: buoys, lights, daymarks, and the lateral system
- Tide and current corrections to course and speed
The 100-Ton exam adds celestial navigation concepts and more complex current vector problems. If you've never done chart work, budget significant time here — it requires practice with actual charts, not just reading.
Section 3: Navigation Problems (100-Ton Only)
On the 100-Ton exam, chart work gets its own module. You'll be given navigation problems requiring you to plot courses, calculate ETAs, apply current corrections, and determine positions using multiple methods. This is heavily skills-based — you need practice with parallel rulers or a plotter, dividers, and a nautical chart.
Budget time for hands-on chart work practice. Reading about it isn't enough — you need to physically work through problems until the process is automatic.
Section 4: Deck General
Deck General is a broad category covering:
- Lines and rigging: knots, splices, line types and their uses
- Anchoring: anchor types, scope calculation, anchoring procedures
- Marlinspike seamanship
- Vessel stability basics: center of gravity, metacentric height, free surface effect
- Loading and trim
- Pumps and bilges
- Basic engine room knowledge (more detailed for 100-Ton)
Deck General rewards practical boating experience. If you've spent time on the water, much of this will feel familiar. If you're coming from a landlocked background, spend extra time here.
Section 5: Tides, Currents, and Weather
Marine weather and tidal science tested here includes:
- Reading tide tables: high/low tide times, heights, rule of twelfths
- Tidal current tables: predicting current speeds at reference and subordinate stations
- Weather systems: highs, lows, fronts, and what they mean for sea conditions
- Cloud types and their forecasting implications
- Wind and wave relationships
- NOAA weather broadcasts and how to use them
- Fog formation types and their causes
Tidal calculation is consistently tested and requires understanding of reference stations, subordinate stations, and time/height difference corrections from the tide tables. Practice with actual NOAA tide table problems.
Section 6: Seamanship
Seamanship covers practical boat handling knowledge:
- Docking and undocking procedures
- Man overboard (MOB) procedures and return approaches
- Towing operations
- Grounding: getting a vessel off a shoal
- Anchoring techniques and scope
- Effects of wind, current, and prop walk on maneuvering
- Vessel handling in heavy weather
In my years on the water, seamanship is the section where experience translates most directly into exam points. If you've spent time docking in tight quarters or handling a boat in chop, the conceptual questions feel like common sense.
Section 7: Safety and Emergency Procedures
Safety questions cover both required equipment and emergency response:
- Personal Flotation Devices (PFDs): types, requirements, and carriage rules
- Fire extinguishers: types (A, B, C, D, K), classes, and when to use each
- Distress signals: flares, sound, visual, and electronic (EPIRB)
- MAYDAY procedures and DSC radio protocols
- Flooding and firefighting aboard
- Abandoning ship: liferaft deployment, survival at sea
- Hypothermia recognition and treatment
Know your fire extinguisher classifications cold. The exam reliably tests which type of extinguisher is required for which type of fire. Type B-I vs. B-II capacity differences are also commonly tested.
Section 8: Federal Requirements
Federal Requirements covers the legal framework for operating a vessel commercially:
- Documentation requirements: what documents must be on board
- Vessel registration and documentation (state vs. federal)
- Carriage of passengers for hire: legal definitions
- Report of marine casualty requirements (when and how to file)
- Drug and alcohol regulations: the legal limits, testing requirements
- The Oil Pollution Act and MARPOL overboard discharge rules
- Manning requirements for different vessel types
Federal Requirements is often the most straightforward section for people who've done their homework on the commercial licensing process — you've already had to understand many of these rules just to get to the exam.
How to Allocate Your Study Time
Based on section weight and difficulty, here's how I'd allocate study effort:
- Rules of the Road: 35% of your time. Highest stakes, highest return on investment.
- Navigation General / Chart Work: 25% of your time. Skills-based, requires hands-on practice.
- Tides and Weather: 15% of your time. Calculation-heavy, practice with real tide tables.
- Deck General: 10% of your time. Experience-dependent; fill gaps systematically.
- Remaining sections: 15% combined. These tend to be the most intuitive with practical boating background.
The Most Common Reason People Fail
They pass everything else and fail COLREGS. I've seen it happen repeatedly. Someone puts in weeks of study, knows their chart work cold, can calculate tides in their sleep — and then misses 3 questions on COLREGS and has to come back for the whole exam.
Don't let that be you. Treat the Rules of the Road section as a separate, harder exam running in parallel with everything else. It needs more time, more practice questions, and more focused review than any other section.
Start with OUPV practice questions to see how you're tracking across all sections before your exam day.