- What This Cheat Sheet Covers (and What It Does Not)
- Credential Snapshot: Who Issues It and What It Is
- The Module Map at a Glance
- Near Coastal vs. Oceans: What Changes
- Rules of the Road Essentials (Q100)
- Deck General, Deck Safety and Stability (Q120, Q121, Q122)
- Navigation General and Navigation Problems (Q123-Q127)
- Common Traps in Counting Modules
- A Route-Aware Study Order
- Before Test Day: Verification Checklist
- Frequently Asked Questions
- The issuer is the U.S. Coast Guard National Maritime Center (NMC); your approval to test lists your assigned modules.
- Full Near Coastal uses seven modules (Q100, Q120, Q121, Q122, Q123, Q125, Q126); full Oceans uses eight.
- Q123 (Navigation General: Near Coastal) and Q124 (Oceans) are alternatives, never simultaneous requirements.
- Q127 (Navigation Problems: Oceans) applies to the Oceans route only; Q126 appears in both full sets.
What This Cheat Sheet Covers (and What It Does Not)
This page condenses the module structure behind the National Master 500/1600 OC or NC (USCG-M500-1600) into a single reviewable reference. It is built around the examination modules the National Maritime Center publishes, grouped into eight preparation groups so you can see the whole map at once. It is a memory aid for structure and scope, not a substitute for the full study process described in our USCG-M500-1600 study guide.
Just as important is what this sheet will not claim. The NMC publishes its modules and topic matrices, but this packet does not establish a single overall question count, a single exam duration, domain percentages, current fees, or a population pass rate. Anyone quoting those as settled facts for this credential is guessing. Where a number matters to you personally, such as which modules you must sit, the authoritative source is your own approval to test.
Credential Snapshot: Who Issues It and What It Is
The USCG-M500-1600 identity here is the National Master 500/1600 OC or NC, an endorsement pathway governed by the United States Coast Guard National Maritime Center. The "OC or NC" in the name refers to the route: Oceans or Near Coastal. The route you are qualifying for determines which navigation modules apply to you. If you are new to the terminology, our explainers on what USCG-M500-1600 is and what the acronym stands for cover the naming in more detail.
| Item | What to remember |
|---|---|
| Governing body | United States Coast Guard National Maritime Center |
| Route options | Near Coastal (NC) or Oceans (OC) |
| Format of requirements | Issuer-published examination modules (Q-codes) |
| Published guide reference | Section 2.1.1.2, printed page 15 |
| What decides your modules | The NMC's individual approval to test |
| Not established here | Percentages, overall question count, duration, fees, pass rate |
The Module Map at a Glance
The eight preparation groups below map directly to the published module headings. Treat them as route-aware study buckets rather than a universal count of exams. Some applicants sit all the modules for their full route; others, depending on eligibility, sit reduced sets. For a deeper walk through each area, see the complete exam domains guide.
| Group | Module | Code | Route |
|---|---|---|---|
| 1 | Rules of the Road: Inland and International | Q100 | Both |
| 2 | Deck General | Q120 | Both |
| 3 | Deck Safety | Q121 | Both |
| 4 | Deck Safety: Stability Problems | Q122 | Both |
| 5 | Navigation General: Near Coastal / Oceans | Q123 or Q124 | NC uses Q123; OC uses Q124 |
| 6 | Navigation Problems: Chart Plot | Q125 | Both |
| 7 | Navigation Problems: Near Coastal | Q126 | Both full sets |
| 8 | Navigation Problems: Oceans | Q127 | Oceans only |
Key Takeaway
Memorize the two full-route sets as lists, not as "eight exams." Near Coastal is Q100, Q120, Q121, Q122, Q123, Q125, Q126. Oceans is Q100, Q120, Q121, Q122, Q124, Q125, Q126, Q127. Everything else is conditional.
Near Coastal vs. Oceans: What Changes
The two full routes share a common core and diverge in navigation. The shared core is Rules of the Road (Q100), Deck General (Q120), Deck Safety (Q121), Stability Problems (Q122), Chart Plot (Q125), and Navigation Problems: Near Coastal (Q126). The route-specific pieces are the Navigation General module and the extra Oceans problem module.
| Feature | Full Near Coastal | Full Oceans |
|---|---|---|
| Total modules in the full set | 7 | 8 |
| Navigation General | Q123 | Q124 |
| Navigation Problems: Near Coastal (Q126) | Included | Included (published original Oceans set) |
| Navigation Problems: Oceans (Q127) | Not included | Included |
Conditional and alternate modules
Beyond the two full sets, the guide describes conditional modules that exist for alternate qualification or raise-of-grade situations: Q130 and Q131, and Q132 through Q135. These are not additions to the full original set, and they should not be folded into your count of required domains. One specific combination is worth remembering: an applicant moving from Near Coastal to Oceans uses Q124 plus Q127 rather than the entire full Oceans set. Whether any of these apply to you is determined by NMC, not by this cheat sheet.
Rules of the Road Essentials (Q100)
Q100 combines Inland and International rules in one module, which is why it rewards side-by-side study rather than separate memorization. Your review should keep the two regimes distinct while recognizing where they overlap.
Domain 1: Rules of the Road: Inland and International (Q100)
This module tests whether you can apply collision-avoidance and signaling rules correctly and tell which regime governs a given situation.
- Know which rule set applies to the waters in a scenario before you apply any rule.
- Review lights and shapes for the vessel types and operating conditions you are likely to see.
- Practice sound signals, including maneuvering and warning signals and restricted-visibility signals.
- Be able to sort out give-way and stand-on responsibilities in crossing, meeting, and overtaking situations.
- Understand how responsibilities between vessels change with vessel type and conditions.
Because every applicant on both routes sits this module in the full sets, it is the best place to build early momentum. Questions here are typically scenario-based, so reading carefully for the waters, visibility, and vessel types in the stem matters as much as knowing the rule.
Deck General, Deck Safety and Stability (Q120, Q121, Q122)
These three modules form the seamanship and vessel-management core of the credential. A common mistake is blending Deck Safety and Stability into a single study topic. They are separate published modules, and your notes should keep them separate.
Domain 2: Deck General (Q120)
Broad vessel-operation and deck-department knowledge expected of a master.
- Review the topic matrix for Q120 from the NMC rather than relying on memory of other endorsements.
- Expect breadth over depth; build a topic checklist and tick items off as you verify them.
Domain 3: Deck Safety (Q121)
Safety-related deck knowledge and responsibilities.
- Organize your study around the topics the NMC matrix lists for Q121.
- Do not substitute an invented "environmental protection" domain; it is not part of this module structure.
Domain 4: Deck Safety: Stability Problems (Q122)
Calculation-oriented module on vessel stability.
- Treat this as a worked-problem module: practice setting up and solving, not just reading.
- Keep a clean method for each problem type so you can reproduce it under time pressure.
- Check your arithmetic habits; small slips compound in multi-step stability problems.
Navigation General and Navigation Problems (Q123-Q127)
Navigation is where the Near Coastal and Oceans routes separate, and where candidates most often miscount what they owe.
Navigation General: pick one
Q123 (Near Coastal) and Q124 (Oceans) are alternatives. You will be assigned one, not both. If your route is Near Coastal, Q123 is your Navigation General module. If your route is Oceans, it is Q124. Never add them together when tallying your workload.
Navigation Problems
Domain 6: Navigation Problems: Chart Plot (Q125)
Hands-on chart work appears in both full sets.
- Practice with the actual tools and conventions you will be expected to use.
- Build speed and neatness; a correct method executed sloppily still costs you.
Domain 7: Navigation Problems: Near Coastal (Q126)
Near Coastal problem-solving that remains in the published original Oceans set as well.
- Do not skip this if you are on the Oceans route; Q126 is in the full Oceans module list.
Domain 8: Navigation Problems: Oceans (Q127)
Oceans-only problem module, additionally required on the Oceans route.
- Applicants on the NC-to-Oceans path pair this with Q124.
- Near Coastal-only candidates do not sit Q127 in the full set.
If you are weighing how demanding this block is relative to the rest, our piece on how hard the USCG-M500-1600 exam is discusses where candidates tend to feel the pressure, without inventing numbers the issuer has not published.
Common Traps in Counting Modules
Most confusion about this credential comes from counting, not content. Keep these in mind:
- Alternatives are not additive. Q123 and Q124 are alternatives. Likewise, never count alternate Rules or Navigation General modules together as simultaneous requirements.
- "Eight groups" is not "eight exams." The eight preparation groups organize study. The number of groups is not a universal count of examinations for every applicant.
- Upgrade modules are not extra domains. Separate upgrade, raise-of-grade, and route-extension modules are not additional full-original-exam domains.
- The groups are unweighted. No percentages are established here, so do not budget study time by invented weightings.
- Your approval to test rules. NMC determines the individual's assigned modules. If a forum post disagrees with your approval, your approval wins.
Key Takeaway
Before you buy materials or plan a schedule, write down your exact assigned module list from your approval to test. Everything else on this cheat sheet is context for that list.
A Route-Aware Study Order
Generic scheduling advice is less useful than sequencing by module type. A sensible order front-loads the shared core, then spends time where your route differs, and leaves calculation-heavy practice for repeated passes. This is a suggested pattern, not an NMC requirement, and you should compress or expand it to match your assigned modules. For a fuller methodology, see the study guide.
Rules of the Road (Q100)
- Review both Inland and International side by side.
- Drill lights, shapes, and sound signals daily in short sessions.
Deck General and Deck Safety (Q120, Q121)
- Work from the NMC topic matrices for each module.
- Keep Q121 notes separate from Q122 notes.
Stability Problems (Q122)
- Solve problems on paper repeatedly until your method is automatic.
- Revisit missed problem types the next day.
Navigation General and Chart Plot (Q123 or Q124, Q125)
- Study only the Navigation General module that matches your route.
- Practice chart plotting with your actual tools.
Navigation Problems (Q126, plus Q127 if Oceans)
- Work problem sets end to end under time constraints.
- Oceans candidates add Q127 practice here.
Mixed review
- Cycle through all your assigned modules with timed practice.
- Use the practice test site to find weak modules, then return to the matrices.
The reasoning behind the order: Rules of the Road builds familiarity with the exam's scenario style at low cost, Stability Problems and the navigation problem modules need repeated hands-on practice and therefore benefit from early starts, and a final mixed pass exposes gaps across modules.
Before Test Day: Verification Checklist
Since this packet does not establish current fees, overall duration, or passing thresholds, verify the logistics directly rather than relying on third-party summaries.
- Confirm your assigned modules in your approval to test.
- Check the NMC pages for the current examination procedures that apply to you.
- Look up any current fees through official channels; see our certification cost breakdown for how to think about the overall budget without relying on stale figures.
- Review the scheduling mechanics in our exam dates guide and confirm how scoring is described in the passing score article.
- Do not use sample questions that claim to reproduce the real exam; practice with original material and do not imply issuer endorsement of any prep source, including ours.
Frequently Asked Questions
It depends on your route and eligibility. The full Near Coastal set lists seven modules and the full Oceans set lists eight, but the published guide also describes reduced examinations for certain applicants. NMC determines your assigned modules, so use your approval to test as the final word.
No. Q123 (Navigation General: Near Coastal) and Q124 (Navigation General: Oceans) are alternatives. You are assigned the one that matches your route, and they should never be counted together as simultaneous requirements.
No. Q127 (Navigation Problems: Oceans) is Oceans-only in the full sets. Q126 appears in both the full Near Coastal and full Oceans module lists, and an NC-to-Oceans applicant uses Q124 plus Q127.
No. Deck Safety is Q121 and Deck Safety: Stability Problems is Q122. They are separate published modules, and Stability Problems should not be replaced or merged with any other topic area.
No. The issuer-published modules are treated here as unweighted preparation groups, and no percentages, overall question count, duration, current fees, or population pass rate are established. For context on what is and is not known, see our pass rate article, and for the fuller picture of the credential itself, see the certification overview.