The Exam at a Glance
The USCG OUPV (Operator of Uninspected Passenger Vessels — the “6-pack” license) and Master exam is 4 separate modules. You must score at least 70% on each module. Failing one does not require you to retake the others.
Rules of the Road
- ▸Navigation lights — power, sail, tow, special vessels
- ▸Shapes — ball, cylinder, cone, diamond, basket
- ▸Sound signals — maneuvering and restricted visibility
- ▸Right-of-way hierarchy (NUC > RAM > restricted > fishing > sail > power)
- ▸Crossing, meeting, and overtaking rules
- ▸COLREGS vs. Inland Rules differences
- ▸Vessels in restricted visibility
- ▸Lookout, safe speed, risk of collision
Deck General
- ▸PFD types I–V and carriage requirements
- ▸Fire classification and correct extinguishing agents
- ▸EPIRB categories, registration, and activation
- ▸MARPOL discharge rules — oil, garbage, sewage
- ▸Distress signals — all 15+ approved types
- ▸Stability basics — GM, free-surface, loading effects
- ▸Federal regulations — documentation, numbering, logs
- ▸Hypothermia treatment and first aid basics
Navigation General
- ▸Compass correction — True, Magnetic, Compass (TVMDC)
- ▸Variation (from chart) and Deviation (from card)
- ▸Tides — reading tide tables, predicting high/low
- ▸Currents — set, drift, correcting course
- ▸Speed-Time-Distance (60D=ST)
- ▸Chart symbols, buoys, light characteristics
- ▸Latitude/longitude, measuring distance
- ▸Weather — Beaufort, fronts, fog types, Buys Ballot's Law
Chart Plotting
- ▸Plot a course between two charted positions
- ▸Apply compass correction (Variation + Deviation)
- ▸Current triangle — solve for Course Made Good and Speed Made Good
- ▸Dead reckoning — advance position using course, speed, time
- ▸Measure distance with dividers on latitude scale
- ▸Convert True course to Magnetic and then Compass
- ▸Read chart depths, symbols, and buoy positions
- ▸NOAA Training Chart 1210Tr (standard exam chart)
132
Total exam questions (99 multiple choice + 3 chart problems)
70%
Minimum passing score on every module
24/33
Minimum correct answers on each 33-question module
8–12 Week Study Plan
This plan assumes 1–2 hours of focused study per day. Candidates with active on-the-water experience can compress the timeline. Never skip the chart plotting phase — it requires physical repetition that cannot be rushed.
Rules of the Road
Memorize all lights, shapes, and sound signals
- ▸Draw and label navigation light arcs for each vessel type
- ▸Make flashcards for all shapes and their meanings
- ▸Memorize sound signals — maneuvering (1/2/3/5 blasts) and fog signals
- ▸Learn the right-of-way hierarchy in order
- ▸Study COLREGS vs. Inland differences
- ▸Take 10 timed practice sets of 33 questions each
Phase Target
90%+ on practice tests before moving on
Deck General
Cover safety equipment, regs, and fire/stability
- ▸Memorize PFD types I–V and requirements
- ▸Learn fire classes A/B/C/D and extinguishing agents
- ▸Study MARPOL discharge distances by zone
- ▸Review all 15+ distress signals
- ▸Understand EPIRB categories and registration requirements
- ▸Take 10 timed practice sets of 33 questions each
Phase Target
80%+ on practice tests before moving on
Navigation General
Master compass correction, tides, and chart reading
- ▸Practice TVMDC compass conversion problems daily
- ▸Work tide table problems — find high/low times and heights
- ▸Solve Speed-Time-Distance equations (60D=ST)
- ▸Learn chart symbols: buoys, lights, soundings, hazards
- ▸Study current correction — set, drift, vector triangle
- ▸Take 10 timed practice sets of 33 questions each
Phase Target
80%+ on practice tests before moving on
Chart Plotting + Full Review
Drill chart problems and run complete mock exams
- ▸Practice 3-problem chart sets daily on 1210Tr
- ▸Time yourself — aim to complete 3 problems in under 45 minutes
- ▸Run full 4-module mock exams (132 questions total)
- ▸Identify weak spots and drill those topics
- ▸Review all missed questions and understand why
- ▸Assemble your exam-day kit (tools, ID, authorization letter)
Phase Target
Pass all 4 modules consistently before scheduling exam
Navigation Lights — Memorization Guide
Navigation lights are the single highest-volume topic on Rules of the Road. Master each vessel type cold — the exam uses every variation. Use these arc facts and mnemonics to lock them in.
Light Arc Quick Reference
225°
Masthead / Sternlight
112.5°
Each sidelight (port or starboard)
135°
Sternlight
360°
All-round lights
Power vessel underway (≥50m)
Forward masthead (225°) + After masthead higher + Red port (112.5°) + Green starboard (112.5°) + White stern (135°)
Big power boat: 2 masthead lights, the after one is HIGHER
Power vessel underway (<50m)
1 white masthead (225°) + Red port + Green starboard + White stern
Small power: 1 masthead is optional to show 2nd — but 1 is minimum
Sailing vessel under sail only
Red port + Green starboard + White stern (NO masthead light)
Sails only = no masthead white. Add engine = add masthead. 'Sail + Engine = Power vessel'
Vessel NUC (Not Under Command)
2 red all-round lights, vertical — no sidelights unless making way
NUC = 2 red balls (day) / 2 red all-round (night). Not moving = no red/green sides.
Vessel at anchor (<50m)
1 white all-round anywhere visible
Anchor ball (day) = black ball forward. Night = 1 white anywhere.
Towing vessel (tow >200m)
3 white masthead lights (vertical) + sidelights + stern + yellow towing light
Long tow = 3 whites. Short tow = 2 whites. Remember: more lights = longer tow.
Pilot vessel on duty
White over red all-round lights + sidelights + stern when underway
White OVER red = 'White Hat, Red Coat' — the pilot's uniform. Easy to mix with NUC (red/red).
Fishing vessel (trawling)
Green over white all-round + sidelights + stern if making way
Trawling = Green OVER white. Other fishing = Red over white. Green = Trawling.
Sound Signals — Complete Reference
Sound signals split into two categories: maneuvering signals (vessels in sight of one another) and restricted visibility signals (fog, heavy rain, dense snow). The exam asks both categories constantly.
| Signal | Meaning / Use |
|---|---|
| 1 short blast | Altering course to starboard (Inland: proposing to pass port-to-port) |
| 2 short blasts | Altering course to port (Inland: proposing to pass starboard-to-starboard) |
| 3 short blasts | Operating astern propulsion |
| 5 or more short blasts | Danger signal — doubt or failure to understand the other vessel's intentions |
| 1 prolonged blast | Power vessel underway in restricted visibility (every 2 min) |
| 2 prolonged blasts | Power vessel underway but stopped (every 2 min) |
| 1 prolonged + 2 short | Vessel under sail, NUC, RAM, towing, fishing (every 2 min) |
| 1 prolonged + 3 short | Vessel being towed (last in tow, every 2 min) |
| Rapid bell ringing (~5 sec) | Vessel at anchor in restricted visibility (every 1 min) |
| 3 bell strokes + rapid ringing + 3 strokes | Vessel at anchor warning of position — may also sound whistle signal |
COLREGS vs. Inland — Key Difference
Under International Rules (COLREGS): 1 short blast = altering course to starboard; 2 short blasts = altering course to port. These are action signals. Under Inland Rules: 1 blast = proposing to pass port-to-port; 2 blasts = proposing to pass starboard-to-starboard. These are proposal signals that require an answer. The 5-blast danger signal is the same in both.
Fog Signal Timing
Power vessel underway: 1 prolonged blast every 2 minutes. Power vessel stopped: 2 prolonged blasts every 2 minutes. Sailing, NUC, RAM, towing, fishing: 1 prolonged + 2 short every 2 minutes. Vessel at anchor: rapid bell ringing for ~5 seconds every 1 minute. The exam always asks about timing — memorize 2 minutes (underway) and 1 minute (anchor).
Chart Plotting — Tools and Technique
Chart plotting is the only module that cannot be studied by reading alone. You must practice with physical tools on a real nautical chart. NOAA Training Chart 1210Tr is the standard exam chart — download it free or buy the printed version.
Parallel Ruler
Walk from compass rose to plot lines; transfer bearings and courses
Tip: Practice walking it without slipping — on a real chart, one slip means wrong answer
Course Plotter (Weems & Plath)
Lay directly on chart — built-in degree scale reads bearing without compass rose
Tip: Faster and more accurate than parallel ruler for most students; worth buying
Dividers
Measure distances on the latitude scale (1 minute = 1 nautical mile)
Tip: ALWAYS use the latitude scale on the side of the chart, NOT the longitude scale at top/bottom
Pencil + Eraser
Plot all lines lightly so you can correct mistakes
Tip: Bring 2 sharpened pencils — a broken tip in the exam room wastes time
Non-programmable Calculator
Speed-time-distance and current triangle calculations
Tip: Practice solving current triangle problems by hand first; calculator is a check, not a crutch
The 3 Chart Problems — What to Expect
Course and Distance
Plot a rhumb line from Point A to Point B on the chart. Measure the true course with your plotter. Apply Variation (from the nearest compass rose) and Deviation (from the given deviation card) to convert True to Magnetic to Compass. Measure the distance in nautical miles using dividers on the latitude scale.
Current Triangle (Vector Problem)
Given a vessel course and speed, plus current set and drift, find the Course Made Good (CMG) and Speed Made Good (SMG). Draw the three vectors: intended course (heading), current vector (set/drift), and solve for the resultant ground track. This is the problem most students skip in practice and then fail on the exam.
Dead Reckoning (DR) Position
Starting from a known position, plot a DR position given course, speed, and elapsed time. Calculate distance run (D = S × T ÷ 60), advance that distance along the course line, and mark the DR position. The exam may then ask for the bearing and distance to a charted landmark from the DR position.
Compass Correction — TVMDC
Compass correction is one of the highest-tested topics across both Navigation General and Chart Plotting. One direction error will cost you points on both modules.
Mnemonic — reading True → Compass (or reverse)
True · Variation · Magnetic · Deviation · Compass
True → Compass (applying corrections)
Mnemonic: “Can Dead Men Vote Twice At Elections”
- ▸East errors are subtracted going T→C
- ▸West errors are added going T→C
- ▸Variation comes from the chart compass rose
- ▸Deviation comes from the vessel's deviation card
Compass → True (removing corrections)
Reverse of TVMDC: C→D→M→V→T
- ▸East errors are added going C→T
- ▸West errors are subtracted going C→T
- ▸“East is least, West is best” — compass heading (C→T): East errors make C less than T
Example:
True course 090°. Variation 10°W. Deviation 5°E. Find Compass course.
T(090) → apply Variation 10°W → add (West = add T→C) → Magnetic 100°
M(100) → apply Deviation 5°E → subtract (East = subtract T→C) → Compass 095°
Common Mistakes — and How to Avoid Them
These are the patterns that cause prepared candidates to fail. Knowing them in advance is often the difference between a pass and a costly retake.
Skipping chart plotting practice
Buy or download NOAA Chart 1210Tr. Drill all 3 problem types a minimum of 15 times before the exam.
Confusing COLREGS and Inland Rules
For every sound signal and light question, ask yourself: 'Which rules apply here?' Inland vs. COLREGS differences are heavily tested.
Wrong compass correction direction
Use 'Can Dead Men Vote Twice At Elections' (C→T adds East). Drill 20 problems per direction until it's automatic.
Forgetting to register for the NMC exam properly
You must have an approved application and exam authorization letter BEFORE scheduling your exam date. Allow 4–6 weeks for processing.
Neglecting Deck General for Rules of the Road
Students who score 95% on Rules often fail Deck General. Treat all 4 modules equally in your study calendar.
Measuring distance on the wrong chart scale
Distance is measured using the latitude scale on the SIDE of the chart (1 minute = 1 NM). The longitude scale at top/bottom is NOT for distance measurement.
Memorizing answers without understanding
The exam question bank rotates. If you understand the rule, any question phrasing works. Memorizing specific questions is unreliable.
Not bringing required tools to the exam
Bring your own parallel ruler/plotter, dividers, and pencils. Some centers provide tools but many do not — don't assume.
Exam Day Checklist
What to Bring
- ✓Government-issued photo ID(required)
- ✓NMC exam authorization letter (printed or on phone)(required)
- ✓Parallel ruler or course plotter(required)
- ✓Dividers(required)
- ✓2 sharpened pencils with erasers(required)
- ○Non-programmable calculator
- ○Snacks and water (check testing center policy)
Do NOT Bring
- ✗Cell phone (or must be off and stored)
- ✗Smart watches or fitness trackers
- ✗Notes, textbooks, or reference cards
- ✗Programmable calculators
- ✗Tablets or laptops
Logistics
- ▸Arrive 15–30 minutes early
- ▸Budget 2–3 hours total for all 4 modules
- ▸Most centers allow breaks between modules
- ▸You will receive your results immediately after completion
- ▸If you fail one module, you may retake only that module — ask to reschedule before leaving
Frequently Asked Questions
How many modules are on the USCG captain's license exam and what is each about?
The USCG OUPV (6-pack) and Master exam consists of 4 modules: (1) Rules of the Road — 33 questions covering COLREGS and Inland Rules for lights, shapes, sound signals, steering/sailing rules, and restricted visibility; (2) Deck General — 33 questions on safety equipment, fire fighting, stability, MARPOL, federal regulations, and emergency procedures; (3) Navigation General — 33 questions on navigation theory, compass correction, tides and currents, chart symbols, speed/time/distance, and weather; (4) Chart Plotting — 3 practical problems requiring a parallel ruler or plotter and dividers on a real nautical chart. You must pass all 4 modules to receive your license.
What is the passing score for the USCG captain's license exam?
You must score at least 70% on each module to pass. For the 33-question modules (Rules of the Road, Deck General, Navigation General), you need a minimum of 24 correct answers out of 33. For Chart Plotting, the 3 problems are graded pass/fail based on accuracy within acceptable tolerances. If you fail one module, you may retake only that module — you do not have to retake the entire exam. The NMC (National Maritime Center) administers the exam at approved testing centers (RPSEs).
How long should I study for the USCG captain's license exam?
Most candidates without maritime background need 8–12 weeks of focused study, dedicating 1–2 hours per day. Candidates with active sailing or boating experience may be ready in 6–8 weeks. The heaviest content load is Rules of the Road (pure memorization of lights, shapes, and sound signals) and Chart Plotting (a physical skill requiring tool practice). Start with Rules of the Road in weeks 1–3, add Deck General in weeks 4–6, tackle Navigation General in weeks 7–9, and run chart plotting drills and full practice tests in the final 2–3 weeks. Never neglect chart plotting — students who rush this section fail most often.
What are the most tested topics on Rules of the Road?
The highest-frequency Rules of the Road topics are: (1) Navigation lights — which lights are required on power vessels, sailboats, and vessels under oars by length and condition; (2) Sound signals — maneuvering signals in sight of another vessel (1, 2, 3, 5 blasts) and restricted visibility signals (1 prolonged, 1 prolonged + 2 short, 2 prolonged, etc.); (3) Shapes — ball, cylinder, cone, diamond, and combinations for vessels at anchor, NUC, RAM, constrained by draft, fishing, towing; (4) Right of way hierarchy — who gives way to whom (NUC > RAM > constrained by draft > fishing > sailing > power-driven); (5) Crossing, meeting, and overtaking rules for both COLREGS and Inland Rules. Know the differences between Inland and International rules — the exam tests both.
What are the most tested topics on Deck General?
Top Deck General topics: (1) PFD types I–V and their requirements — Type I for offshore, Type II for near-shore, Type III for calm water, Type IV throwable, Type V special use; (2) Fire classes and extinguishing agents — Class A (ordinary combustibles, water/foam), Class B (flammable liquids, CO2/dry chemical), Class C (electrical, CO2/dry chemical, never water), Class D (metals); (3) EPIRB categories and registration — Class I vs. Category I/II, float-free vs. manual activation; (4) MARPOL — discharge restrictions for oil, garbage, and sewage by distance from shore and in special areas; (5) Stability — effects of free-surface, loading high vs. low, GM and righting arm; (6) Distress signals — all 15+ approved visual signals, the SOLAS orange smoke, and parachute flare ranges.
What are the most tested topics on Navigation General?
Navigation General high-frequency topics: (1) Compass correction — converting between True, Magnetic, and Compass using Variation (from charts) and Deviation (from deviation card); the mnemonic 'Can Dead Men Vote Twice At Elections' (Compass, Deviation, Magnetic, Variation, True, Add East); (2) Tides and currents — reading tide tables, predicting current set and drift, correcting for current in a course calculation; (3) Speed-Time-Distance — 60D=ST problems and solving for any variable; (4) Latitude and longitude — reading coordinates on a chart, measuring distance (1 minute latitude = 1 nautical mile); (5) Chart symbols — buoy colors and shapes, light characteristics (Fl, Oc, Iso, Q, F), depth soundings, danger areas; (6) Weather — Beaufort scale, fronts, isobars, fog types (radiation vs. advection), Buys Ballot's Law.
How do I pass the chart plotting module?
Chart Plotting is a hands-on skill — you cannot memorize your way through it. You must practice with real tools: a parallel ruler or course plotter (Weems & Plath or Douglas), dividers, and a pencil on an actual nautical chart (NOAA Training Chart 1210Tr is standard). The 3 problems test: plotting a course from point A to point B (applying variation and deviation), solving a current triangle (accounting for set and drift to find CMG/SMG), and a dead reckoning position fix. Practice each problem type 10–15 times before the exam. Common failures: forgetting to apply leeway/current, measuring distance on the wrong latitude scale, or using True course when Magnetic is required. Bring your own tools — some centers provide them but many do not.
What is the best way to memorize navigation lights for the USCG exam?
Use mnemonics and visual grouping. For a power vessel underway: red port (left, even 2 letters), green starboard (right), white masthead forward, white stern aft. For sailboats under sail only: red/green sidelights + white stern (no masthead light). Vessels under 7 meters may show a single white all-round light. The key exam traps: a sailing vessel using its engine becomes a power vessel and must show masthead light; a tug with tow over 200 meters shows 3 masthead lights (not 2); a vessel NUC shows 2 red all-round lights in a vertical line. Draw the light arcs on flashcards — 225° for masthead/sternlight, 112.5° for each sidelight, 360° for all-round lights. Color-code them: red/green/white and add arc degrees.
What should I bring to the USCG captain's license exam?
Required items: government-issued photo ID, your NMC exam authorization letter (issued after your application is approved), and all required chart plotting tools (parallel ruler or course plotter, dividers, pencil with eraser). Optional but strongly recommended: a non-programmable scientific calculator (some centers provide them, bring your own to be safe), and the NOAA Training Chart 1210Tr if you want to practice beforehand (the exam uses a version of this chart). Do NOT bring cell phones, smart watches, reference books, or notes into the testing room. Arrive 15–30 minutes early. The exam is untimed for most NMC testing centers, but budget 2–3 hours. Wear comfortable clothing — you may be at the exam table for several hours.
What are the most common mistakes that cause people to fail the captain's exam?
The top failure causes: (1) Neglecting chart plotting — it requires physical practice with tools, not just reading; (2) Confusing COLREGS and Inland Rules — many questions hinge on whether you're on inland waters vs. international waters; (3) Misreading light questions — not knowing whether a vessel is 'in sight' or 'in restricted visibility' changes the answer entirely; (4) Skipping Deck General — students focus on Rules and Navigation, then fail Deck General on fire extinguisher types or MARPOL distances; (5) Not taking practice tests under exam conditions — reading is not the same as recalling under pressure; (6) Compass correction direction errors — adding when you should subtract or vice versa. The fix: use the TVMDC mnemonic and consistently work in one direction.
Deep Dives by Module
Navigation Lights Guide
Complete reference for every vessel type — power, sail, tow, anchor, and special vessels with light arcs.
Rules of the Road
Steering rules, right-of-way hierarchy, COLREGS vs. Inland, and all sound signals with exam tips.
Deck General Safety
PFDs, fire extinguishers, EPIRB, MARPOL, distress signals, and stability — the entire module covered.
Put the Strategy to Work — Practice Free
NailTheTest gives you real USCG-style questions across all 4 modules with instant feedback and AI-powered explanations. Track your score by module, identify weak spots, and pass with confidence.
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