How to Study for the USCG 200-Ton Master Exam: A Week-by-Week Plan

The 200-Ton Master is the credential where the exam stops being approachable and starts demanding real discipline. Depending on your route, you are now dealing with celestial navigation, advanced stability, deep Rules of the Road, and very likely a separate radar endorsement — plus a more searching oral exam. People who passed the 100-Ton on a few weeks of casual review get a rude surprise here. The 200-Ton punishes light preparation.

That means you need a longer, more structured plan with dedicated celestial and radar blocks built in from the start, not bolted on at the end. This is a six-week schedule with daily targets. For the syllabus — which modules, which route options, how many questions — see the 200-Ton license page. This article is purely about how to study.

Diagnose First, Especially Celestial and Radar

Before week one, take a full cold diagnostic across every module. For the 200-Ton, pay particular attention to two areas that the lower licenses do not test seriously: celestial navigation and radar plotting. These are skill modules, not memorization modules, and they take the longest to build — so you want an honest baseline early.

Run your diagnostic across rules-of-the-road, deck-general, navigation-general, chart-plotting, meteorology, safety, celestial-navigation, and radar. Write down every score. Celestial and radar will almost certainly be your lowest, and that is fine — the plan front-loads them so they have the most weeks to mature. As the old hands in the islands say, you read the stars long before you need them.

The Six-Week Plan

This assumes 12 to 15 hours of study per week. Do not compress celestial and radar; they need calendar time for the technique to set. Stretch the plan rather than rush those blocks.

Week 1 — Rules and Deck Foundations

• Day 1: Read all 38 Rules of the Road for structure. Anchor on Rule 5 (lookout) and Rule 6 (safe speed) — at 200 tons the examiner expects you to treat these as the bedrock of every collision scenario.
• Day 2: Steering and sailing — Rule 13, Rule 14, Rule 15, and Rule 18. 35 questions on these only.
• Day 3: Deck general — ground tackle, lines and breaking strains, cargo gear, watchkeeping. 35 questions.
• Day 4: Deck general — firefighting, damage control basics, helm and engine orders. 35 questions.
• Day 5: Re-do every miss. Missed questions are your real curriculum.
• Weekend: 35-question timed Rules block; log time per question.

Week 2 — Celestial Navigation, Block One

Start celestial early and keep returning to it. It is the module that rewards spaced practice and punishes cramming.

• Day 1: The celestial framework — the celestial triangle, GHA and LHA, declination, and how a line of position is derived. Read slowly; understand before you compute.
• Day 2: Sextant theory and corrections — index error, dip, refraction, semidiameter. Work through five sun-sight corrections by hand.
• Day 3: The sight reduction process end to end using the Nautical Almanac and sight reduction tables. Reduce three sun sights fully.
• Day 4: Latitude by Polaris and a noon-sight (Local Apparent Noon) latitude. Work five problems.
• Day 5: Re-do every celestial problem you got wrong. Celestial is mechanical — the same mistakes recur until you drill them out.
• Weekend: 20 celestial-navigation problems, untimed, focused on accuracy.

Week 3 — Coastal Navigation, Chart Plotting, and Radar Block One

• Day 1: Compass theory, the TVMDC chain, variation, deviation, deviation tables. 30 navigation-general questions.
• Day 2: Physical chart plotting by hand — parallel rules, dividers, six courses on a training chart. Paper and real tools, like the exam.
• Day 3: Set and drift, current sailing, running fixes, ETA work. Six full chart problems, timed at four minutes each.
• Day 4: Radar fundamentals — relative versus true motion, the radar plot, deriving CPA and TCPA from a maneuvering board. Work five plots by hand.
• Day 5: Radar continued — interpreting a target's course and speed, assessing risk of collision by radar under Rule 7, and radar's role in restricted visibility under Rule 19. 20 radar questions.
• Weekend: Mixed 40-question block from chart-plotting and navigation-general.

Week 4 — Celestial and Radar Block Two, plus Weather

• Day 1: Celestial again — running fix from a morning sun line advanced to a noon latitude, and a star or planet sight. Reduce four sights.
• Day 2: Radar again — a full maneuvering-board problem: find target CPA, then determine your evasive course and speed to open it to a safe distance. Five plots.
• Day 3: Meteorology — pressure systems, fronts, fog, tropical systems, reading a weather map. 30 meteorology questions.
• Day 4: Safety and stability — lifesaving gear, distress signals, free-surface effect, downflooding, stiff versus tender. 30 safety questions.
• Day 5: Re-do all misses from the week, weighting celestial and radar.
• Weekend: Full timed practice exam, scored by module. Note your two lowest.

Week 5 — Drill the Bank Hard

The NMC bank is public and finite. High-rep repetition with a miss log.

• Day 1: Full lights and shapes sweep. Arc widths cold: masthead 225, sidelights 112.5 each, sternlight 135, all-round 360. Drill vessel lights identification to reflex.
• Day 2: Full sound-and-fog-signal sweep with the Inland-versus-COLREGS divergences.
• Day 3: Full deck-general and navigation-general bank sweeps. Anything under 80% re-drilled.
• Day 4: Celestial sweep — reduce sights until the procedure is automatic and your answers land within tolerance.
• Day 5: Radar sweep — work plots until CPA and TCPA derivation is fast and reliable.
• Weekend: Two full timed exams on separate days, no notes, no pausing.

Week 6 — Simulate, Patch, and Prep the Oral

• Day 1: Full-length timed exam across all modules; score by module. Target 82% or better everywhere, with celestial and radar at tolerance.
• Day 2: Patch your two weakest modules only.
• Day 3: Oral-exam prep, whole session (see below).
• Day 4: Final full simulation on the practice exam, plus a second oral run.
• Day 5: Light review only — notes, arc widths, one celestial reduction, one radar plot. No new material.

How to Use Practice Tests Properly

Score by module, never as a blob. Each 200-Ton module is its own gate at 70%. A respectable overall score can hide a failing celestial or radar module. Split the score the way the exam does.

Keep a running miss log. One line per missed question on why. For celestial and radar especially, note whether it was a conceptual gap or a careless arithmetic slip — they need different fixes.

Drill timed weekly per module. Test-day pressure compresses your time, and celestial reductions and radar plots are exactly where rushing breeds errors. Practice under the clock on purpose.

Weak-Area Drilling

When a module sags, isolate the leak. If you are missing crossing scenarios, run nothing but crossing, overtaking, and head-on drills. If radar plots are slow, do nothing but maneuvering-board problems for a session. If celestial is the gap, reduce sun sights until the sequence is reflex. Any sub-topic under 80% on a category drill earns its own dedicated session before exam day — and for the 200-Ton, that rule applies double to celestial and radar.

Preparing for the Oral Exam

At 200 tons the oral is more probing than at 100. The examiner wants a master who can reason through a complex situation, not recite. Talk your answers out loud in full procedure: first action, second action, who you call, how you communicate.

Expect scenarios that braid modules together — a crossing situation developing in restricted visibility where you are tracking the target on radar, then a fire below at the same time. Be ready to explain how you assess risk of collision by radar, when a radar plot justifies an early course change, and how Rule 19 governs your conduct when you cannot see the other vessel. Know your lights and signals verbally, and be able to walk through a sun-sight reduction conceptually if asked. Run mock orals out loud, and study the format in the oral exam guide so nothing about the room surprises you.

Knowing You Are Ready

You are ready when you consistently score 82 to 85% or better on full-length practice exams across every module — repeatably, not once — with celestial reductions landing within tolerance, radar plots solved cleanly under time, and standard scenarios coming out of your mouth steady and ordered. If any module is under 75% in the final two weeks, or celestial and radar are still shaky, move the date. The 200-Ton rewards the patient and humbles the rushed; give it the runway it asks for.

Binnacle AI is not affiliated with the U.S. Coast Guard or the NMC. Exam structures and question counts reflect current NMC guidance as of 2026 — confirm at the NMC website before sitting your exam. This article is informational, not legal or licensing advice.