- NM2GI here means National Master 200 GL and Inland, issued through the U.S. Coast Guard National Maritime Center under scope GLI05.
- The full route is built from five module groups: Rules of the Road, Deck General, Deck Safety, Navigation General, and Chart Plot.
- Q100 and Q300 are alternatives for the Rules of the Road group; never count them as two separate requirements.
- Chart Plot (Q343) is required in the full-exam structure and cannot be skipped in your prep.
NM2GI Certification: What the National Master 200 GL and Inland Credential Actually Covers
- NM2GI Certification: What It Actually Covers
- Who Issues It and What GLI05 Means
- The Five Module Groups at a Glance
- Q100 vs. Q300: An Alternative, Not an Extra Domain
- What You Must Master in Each Domain
- Why Chart Plot (Q343) Deserves Its Own Prep Block
- Q345 and Q346: Separate Routes, Not Extra Domains
- Your Approval to Test Defines Your Exam
- Sequencing Your Preparation by Domain
- Where the Credential Gets Used
- Frequently Asked Questions
Key Takeaways
- NM2GI here means National Master 200 GL and Inland, issued through the U.S. Coast Guard National Maritime Center under scope GLI05.
- The full route is built from five module groups: Rules of the Road, Deck General, Deck Safety, Navigation General, and Chart Plot.
- Q100 and Q300 are alternatives for the Rules of the Road group; never count them as two separate requirements.
- Chart Plot (Q343) is required in the full-exam structure and cannot be skipped in your prep.
- Your NMC approval to test determines your actual modules, so build your plan from that document.
If you are searching for NM2GI certification information, the first thing to settle is identity. This article covers National Master 200 GL and Inland (NM2GI), a mariner credential tied to the U.S. Coast Guard. It is a deck-officer license for operating vessels of less than 200 gross register tons on the Great Lakes and inland waters. If you want the definition-level basics first, our explainers What Is NM2GI Certification? and What Does NM2GI Stand For? cover the naming in detail. This guide focuses on how the examination is structured and how to prepare for it.
Who Issues It and What GLI05 Means
The governing body is the United States Coast Guard National Maritime Center (NMC). The NMC publishes its examination modules and topic matrices publicly, so this is not a mystery syllabus. The scope code that matters for this credential is GLI05, which covers Master or Mate of vessels less than 200 GRT. When you see GLI05 on NMC materials, that is the pathway this article describes.
Several things the NMC does not publish in a way that supports blanket claims are worth stating plainly, so you do not build your plan on folklore:
- There are no published percentage weightings for the module groups, so any "Domain X is 30% of the exam" claim is not grounded in the issuer's materials.
- There is no single overall question count or single overall duration that applies to every applicant.
- Current fees and a population-wide pass rate are not established by the source materials used for this guide.
For that reason, we treat the content as unweighted, route-aware preparation groups. If you want the numbers-focused discussion, see NM2GI Pass Rate 2026: What the Data Shows and NM2GI Certification Cost 2026: Complete Pricing Breakdown, and verify any figure against the current NMC guidance before relying on it.
The Five Module Groups at a Glance
The full-route preparation for NM2GI breaks into five module groups. They map directly to the NMC's published module codes:
| Domain | Module | Focus |
|---|---|---|
| 1. Rules of the Road: Inland and International | Q100 (or Q300 on the restricted inland route) | Navigation rules and the applicable limitation |
| 2. Deck General | Q340 | General deck knowledge |
| 3. Deck Safety | Q341 | Safety knowledge for deck operations |
| 4. Navigation General: Great Lakes and Inland | Q342 | Navigation theory and practice for these waters |
| 5. Navigation Problems: Chart Plot | Q343 | Applied chart-based problem solving |
The exact full-route sets published by the NMC are:
- Great Lakes and Inland: Q100, Q340, Q341, Q342, Q343 (5 modules)
- Inland: Q100 or Q300, Q340, Q341, Q342, Q343 (5 modules)
The "five" here is a count of preparation groups on the full route, not a universal count of examinations every applicant will sit. For a domain-by-domain walkthrough, read NM2GI Exam Domains 2026: Complete Guide to All 5 Content Areas.
Q100 vs. Q300: An Alternative, Not an Extra Domain
The most common mistake candidates make when reading NMC module lists is counting alternatives as additions. Rules of the Road is where this trap sits.
In practical terms, this means the Rules of the Road domain in your study plan is a single block, with the specific module (Q100 or Q300) determined by your approval. If you are unsure which one you are being assigned, resolve that before you invest weeks in the wrong rule set. The same principle applies elsewhere: alternative Rules modules or alternative Navigation General modules are never stacked as simultaneous requirements.
What You Must Master in Each Domain
The NMC's module headings tell you the territory; your job is to turn each heading into concrete competence. Use the published NMC topic matrices as your authoritative checklist, and treat the notes below as orientation.
Domain 1: Rules of the Road, Inland and International (Q100; Q300 as the alternative)
This is the rulebook domain. You need to understand how the rules apply on the waters you will operate on, and whether your route uses the inland-only alternative.
- Know which rule set your approved module covers before you start memorizing.
- Practice applying rules to vessel-encounter scenarios, not just reciting text.
- Be precise about the difference between inland and international application where your module tests it.
Domain 2: Deck General (Q340)
Deck General is the broad seamanship foundation for a master or mate of a smaller vessel.
- Work from the NMC topic matrix for Q340 rather than a generic seamanship outline.
- Expect breadth over depth; coverage gaps hurt more than a single weak topic.
Domain 3: Deck Safety (Q341)
Safety is a separate module with its own matrix, so it deserves its own study block rather than being folded into Deck General.
- Treat safety topics as operational knowledge you could explain aloud, not trivia.
- Map each matrix heading to a plain-language summary you can recall without notes.
Domain 4: Navigation General, Great Lakes and Inland (Q342)
This is the navigation-knowledge module specific to the Great Lakes and inland environment, and it feeds directly into the chart work that follows.
- Study the module as the conceptual backbone for Chart Plot.
- Connect navigation concepts to the practical problems you will later solve on a chart.
For a broader plan that ties these together, see NM2GI Study Guide 2026: How to Pass on Your First Attempt, and keep the NM2GI Cheat Sheet 2026 handy for a compact review once you have done the real studying.
Why Chart Plot (Q343) Deserves Its Own Prep Block
Navigation Problems: Chart Plot is the module candidates most often underestimate, and it is required in the full-exam structure and must not be omitted. Unlike the knowledge-recall modules, this one is applied work: you take given information and produce a result by working it out.
Key Takeaway
Chart plotting is a skill, not a body of facts. Reading about it will not prepare you. Schedule repeated, hands-on practice sessions with the tools and methods you will use at the exam, and do them early enough that mistakes can be corrected before test day.
Because Q343 builds on Q342, a sensible habit is to finish a navigation concept and immediately apply it to a plotting exercise. That reinforces both modules at once. If you are weighing how demanding this credential is overall, How Hard Is the NM2GI Exam? Complete Difficulty Guide 2026 discusses where candidates tend to struggle.
Q345 and Q346: Separate Routes, Not Extra Domains
When you browse NMC materials you will encounter other module codes near this credential. It is important not to fold them into the five-group full route:
- Q345 (Navigation and Deck General/Safety) is a separate module for the raise-of-grade from Master less than 100 to Master/Mate less than 200.
- Q346 belongs to a separate route for an OUPV moving up to Mate less than 200. It is not an extra Master-original module.
Separate upgrade, raise-of-grade, and route-extension modules are not additional domains of a full-original exam. If you are an original applicant, you should not add Q345 or Q346 to your plan. If you are an upgrade applicant, your approval will tell you which module applies, and that document is the final word.
| Situation | Module structure | Note |
|---|---|---|
| Great Lakes and Inland, full route | Q100, Q340, Q341, Q342, Q343 | Five modules |
| Inland, full route | Q100 or Q300, Q340, Q341, Q342, Q343 | Five modules; Q100/Q300 are alternatives |
| Master under 100 to Master/Mate under 200 | Includes Q345 as a separate raise-of-grade module | Not an extra full-original domain |
| OUPV to Mate under 200 | Separate route involving Q346 | Not a Master-original module |
Your Approval to Test Defines Your Exam
Here is the principle that overrides every generalization above: the NMC determines the individual's assigned modules. A published module list describes the pathway; your approval to test describes your exam. Always use the actual approval to test as the source of truth for what you sit.
Also keep a note on source currency. The NMC examination guide referenced for the structure here is the published document effective March 24, 2014, not a newly issued 2026 blueprint, although current indexed NMC matrices corroborate the module headings. The relevant published guide reference is 2.1.2.3 (printed page 27). Because rules and procedures can change, verify against the current NMC pages before committing money or time. Likewise, for any passing-standard question, see NM2GI Passing Score 2026: Exactly What You Need to Pass and confirm with the NMC rather than assuming a number.
Sequencing Your Preparation by Domain
Generic study technique matters less than the order in which you tackle these specific modules. Because Chart Plot depends on navigation knowledge, and because Rules of the Road underpins everything on the water, a domain-ordered plan works better than studying whatever feels easiest. A sample sequence:
Rules of the Road
- Confirm whether your approval uses Q100 or Q300.
- Learn the applicable rules and apply them to encounter scenarios.
Deck General and Deck Safety
- Work through the Q340 and Q341 topic matrices as separate blocks.
- Summarize each heading in your own words.
Navigation General, then Chart Plot
- Study Q342 concepts, then immediately practice plotting for Q343.
- Repeat plotting drills until your method is consistent.
Integrated review
- Use timed practice tests to find residual weak spots.
- Re-drill your weakest module rather than rereading your strongest.
Adjust the timeline to your experience; seasoned mariners may compress the safety and deck blocks and spend longer on plotting. For structured support, explore NM2GI Training options alongside the NM2GI practice test platform for question-style rehearsal. Do not reproduce or rely on leaked questions; practice on original material and always keep in mind that nothing here implies endorsement by the issuer.
Where the Credential Gets Used
A master or mate license for vessels under 200 GRT on the Great Lakes and inland waters points toward operators of smaller commercial vessels on those waterways. That is the nature of the credential's scope; the exact employers and roles vary by region and vessel type, and specific pay figures are not established here, so we avoid quoting any. To explore roles and employment context, read NM2GI Jobs, and for the financial angle see NM2GI Salary Guide 2026: Complete Earnings Analysis and Is the NM2GI Certification Worth It? Complete ROI Analysis 2026. If your question is about terminology rather than careers, NM2GI Meaning and What Is NM2GI? will help.
Frequently Asked Questions
The United States Coast Guard National Maritime Center issues it under scope GLI05, which covers Master or Mate less than 200 GRT.
The full route is organized into five preparation groups: Rules of the Road (Q100 or the Q300 alternative), Deck General (Q340), Deck Safety (Q341), Navigation General (Q342), and Chart Plot (Q343). This is a count of preparation groups, not a universal count of exams for every applicant.
No. They are alternatives. Great Lakes and Inland uses Q100, while Inland may use Q300 when the applicable COLREGS limitation is accepted. Your NMC approval to test confirms which applies.
No. Q345 is a separate raise-of-grade module (Master less than 100 to Master/Mate less than 200), and Q346 belongs to a separate OUPV-to-Mate less than 200 route. Neither is an extra domain for an original Master applicant.
The NMC publishes modules and topic matrices, but the source materials for this guide do not establish module percentages, a single overall question count or duration, current fees, or a population pass rate. Check the NMC directly for current details.