- NMUGI is the USCG National Maritime Center exam path for Mate of Unlimited Tonnage Great Lakes and Inland (GLI02).
- Q100 is the Rules module for Great Lakes and Inland; Inland applicants use Q100 unless they request Q300.
- Q300 produces a geographic COLREGS limitation on the credential, so choose it deliberately.
- Q312 applies only to the Great Lakes route; Inland-only routes omit it.
What This Exam Actually Is
National Mate Unlimited GL and Inland (NMUGI) is the examination path administered by the United States Coast Guard National Maritime Center (NMC) for the credential designated GLI02, Mate of Unlimited Tonnage Great Lakes and Inland. It is not a commercial certification you sit at a private testing center. It is a federal licensing examination for deck officers, and it is organized as a set of separate modules rather than one single paper.
That structure shapes everything about how you should prepare. You are not studying for one broad test with a single blended score. You are preparing for several distinct modules, each with its own subject boundaries, and which ones you sit depends on your route. If you are still getting oriented on the credential itself, the overview at What Is NMUGI? covers the basics, and NMUGI Requirements 2026: Eligibility, Prerequisites & How to Qualify explains who can apply in the first place.
The Module Map: Which Exams You Sit
The single most common source of confusion is the module count. Candidates see "Q100, Q300, Q308, Q309, Q310, Q311, Q312" and assume all seven are required. They are not. The Rules of the Road appear as alternatives, and Q312 is route-specific.
| Module | Subject | When It Applies |
|---|---|---|
| Q100 | Rules of the Road: International and Inland | Great Lakes and Inland route; also the default for Inland applicants |
| Q300 | Rules of the Road: Inland | Inland applicants who request it; results in a geographic COLREGS limitation |
| Q308 | Deck General | All full initial routes |
| Q309 | Deck Safety | All full initial routes |
| Q310 | Navigation General Great Lakes and Inland | All full initial routes |
| Q311 | Chart Plot | All full initial routes |
| Q312 | Great Lakes Topics | Great Lakes route only; omitted on Inland-only routes |
In practice, a full initial route ordinarily comes to six modules for Great Lakes and Inland (one Rules module, Q308, Q309, Q310, Q311, and Q312) or five for Inland (the same set without Q312). You would not sit both Rules modules as a universal seven-module exam.
Upgrade routes work differently
If you already hold an Inland credential and want to add Great Lakes, an increase from Inland to Great Lakes and Inland requires Q312. If your existing credential carries a COLREGS limitation, Q100 is additionally required to clear it. This matters because it means an upgrade candidate may face a much shorter, more targeted examination than someone starting from scratch.
For a closer look at how these content areas are grouped, see NMUGI Exam Domains 2026: Complete Guide to All 6 Content Areas. The six headings used throughout this article are topic groups, not percentage weights, so do not assume any one carries a fixed share of the total.
Rules of the Road (Q100 and Q300)
The Rules module is where the Great Lakes and Inland identity of this credential is clearest, because it forces a choice between international and inland-only rules.
Q100: Rules of the Road, International and Inland
The published topic areas are Watchkeeping, COLREGS, and the Inland Navigational Rules. This is the module specified for Great Lakes and Inland.
- Know both rule sets side by side, including where Inland and International provisions differ
- Watchkeeping principles appear here as well as in Deck General
- Taking Q100 avoids a geographic COLREGS limitation on your credential
Q300: Rules of the Road, Inland
Covers Watchkeeping and the Inland Navigational Rules only. Inland applicants use Q100 unless they specifically request Q300.
- Narrower scope means less to memorize
- The trade-off is a geographic COLREGS limitation on the resulting credential
- Think about your career intentions before choosing this shorter path
Deck General (Q308)
Q308 is the broadest module by published topic count, and for many candidates it is the one that rewards steady, wide reading rather than last-minute cramming. It spans seamanship, ship handling, cargo, and maritime law and management.
Seamanship and watchkeeping
Expect marlinspike seamanship, purchases, blocks and tackle, and the basic principles of watchkeeping. The published list also calls out Navigation Safety Regulations under 33 CFR 164, which is a regulation you should read directly rather than rely on summaries for.
Vessel maneuvering and handling
This is the heart of the module for a prospective mate. Published topics include:
- Vessel handling in rivers and estuaries
- Maneuvering in shallow water
- Interaction with a bank or a passing ship
- Berthing and unberthing
- Anchoring and mooring, including dragging and clearing fouled anchors
- Heavy weather operations
- Turn circle, pivot point, advance and transfer
- Maneuvering characteristics of major vessel types
- Wake reduction
- Ice operations and ice navigation
Several of these items (heavy weather operations, maneuvering characteristics of major vessel types, and ice operations) carry a Great Lakes-specific footnote in the NMC matrix. If you are on the Great Lakes route, treat those as priority material rather than optional detail.
Cargo, law, and ship management
The cargo portion covers stowage and security including cargo gear, loading and discharging operations, dangerous and hazardous cargo regulations, and tank vessel and fuel oil operations. The management portion covers national maritime law, credentialing of seamen, vessel alteration, repair and hot work, safety, ship's business, and the certificates and documents required aboard.
Key Takeaway
Q308 punishes shallow preparation because it is so wide. Build a topic checklist from the published list and tick items off only when you can explain them without notes, especially the maneuvering topics, which sit closest to real mate duties.
Deck Safety (Q309)
Q309 groups stability, construction, damage control, firefighting, emergencies, and lifesaving. It tests whether you can keep a vessel and its people safe when things go wrong.
Stability, Construction, and Damage Control
Principles of vessel construction, trim and stability, vessel structural members, and damage control. The first three carry the Great Lakes footnote in the NMC matrix.
- Be fluent in the vocabulary of structural members
- Understand how trim and stability change as cargo and ballast move
- Know damage control priorities and temporary repairs
Firefighting and Emergency Procedures
Classes and chemistry of fire, firefighting systems and equipment, fire drills, abandon ship procedures, emergency steering, man overboard, emergency towing, and rescuing survivors from a ship or aircraft in distress.
- Match each fire class to its appropriate agent and system
- Walk through abandon ship and man overboard sequences step by step
- Know the regulations that govern firefighting equipment
Communications, Signals, and Lifesaving
Storm, wreck, distress, and special signals, plus lifesaving appliance regulations and operation.
- Signals are recall-heavy, so repetition pays off here
- Pair the regulations with how each appliance is actually operated
The module also touches vessel power plants and marine engineering terms, which is a reminder that a deck officer is expected to speak the language of the engine room well enough to coordinate in an emergency.
Navigation General and Chart Plot (Q310, Q311)
These two modules overlap in subject but differ in character. Q310 is the knowledge exam; Q311 is the hands-on chart work.
Q310: Navigation General Great Lakes and Inland
Published topics include piloting, distance off, bearing problems, fix or running fix, chart navigation, dead reckoning, electronic navigation, instruments and accessories, aids to navigation, and charts, publications, and Notices to Mariners. It also covers compasses (magnetic and gyro, including principles, operation, maintenance, and error determination), terrestrial observation, meteorology and oceanography (weather systems, ocean current systems, weather charts and reports, tides and tidal currents), and the Navigation Safety Regulations in 33 CFR 164.
Q311: Chart Plot
Q311 draws on the piloting side of the same material: distance off, bearing problems, fixes and running fixes, chart navigation, dead reckoning, electronic navigation, instruments, aids to navigation, and chart publications and notices. The skill being tested is accurate, orderly plotting under time pressure.
Great Lakes Topics (Q312)
Q312 exists because the Great Lakes route carries its own body of knowledge. It is required for the Great Lakes and Inland credential and omitted on Inland-only routes. Its published list reuses many themes from the other modules, applied to Great Lakes operations: piloting and fixes, compass error, meteorology and tides, vessel maneuvering and handling, ice operations, stability and damage control, and cargo and tank vessel operations.
The practical lesson is that Q312 is not an isolated island. It rewards candidates who have already built solid foundations in Q308, Q309, Q310, and Q311, because it asks you to apply the same concepts in a Great Lakes context, including the items carrying the Great Lakes footnote. Studying Q312 last, after the others, tends to feel like consolidation rather than new learning.
Sequencing Your Preparation
Generic study methods matter less here than the order in which you tackle the modules. Because the content overlaps heavily, a sensible sequence builds from shared foundations outward. Use this as a starting template and adjust it to your route and your sea-time background.
Rules of the Road (Q100 or Q300)
- Learn the rule sets first, because watchkeeping and collision avoidance concepts recur elsewhere
- Decide on Q100 versus Q300 early so you study the right scope
Navigation General and Chart Plot (Q310, Q311)
- Start plotting by hand immediately, since this skill needs the longest runway
- Fold compass error, weather, and tides into the same sessions
Deck General and Deck Safety (Q308, Q309)
- Work through the maneuvering, cargo, and law topics against your checklist
- Pair firefighting and lifesaving regulations with operational walkthroughs
Great Lakes Topics (Q312) and Review
- Apply earlier material to Great Lakes conditions, especially the footnoted topics
- Run timed mixed review across every module you will actually sit
Candidates adding Great Lakes to an existing Inland credential can compress this dramatically, focusing on Q312 and, if needed, Q100. Timing for actual sittings is covered in NMUGI Exam Dates 2026: Testing Windows, Deadlines & Scheduling, and a quick-reference companion lives at NMUGI Cheat Sheet 2026: One-Page Review of Must-Know Facts.
Where First-Time Candidates Lose Ground
- Misreading the module count. Preparing for seven exams when your route has five or six wastes time. Confirm your exact module list first.
- Choosing Q300 without considering the limitation. A COLREGS limitation follows the credential, so make that choice on purpose.
- Skipping the primary regulations. 33 CFR 164 appears in more than one module. Reading it directly beats secondhand summaries.
- Treating chart plot as theory. Plotting is a practiced skill. Accuracy and procedure decay if you do not drill them.
- Ignoring the Great Lakes footnotes. The footnoted items in Q308, Q309, and Q312 are flagged for a reason on the Great Lakes route.
- Leaning on stale assumptions about difficulty. Read How Hard Is the NMUGI Exam? Complete Difficulty Guide 2026 for a grounded view rather than hearsay, and note that this site does not assert a specific pass rate or fee figure that the source material does not support.
Key Takeaway
Your best protection against a failed module is precision about scope: know exactly which modules your route requires, study the published topic lists line by line, and spend your hands-on time on plotting and maneuvering rather than rereading what you already know.
When you are ready to test yourself under realistic conditions, the practice questions on the main NMUGI practice test site let you check weak areas module by module, and the broader NMUGI Exam Prep resources help you track progress. For the bigger picture on whether the credential suits your goals, see Is the NMUGI Certification Worth It? Complete ROI Analysis 2026.
Frequently Asked Questions
No. Q100 and Q300 are Rules of the Road alternatives, and Q312 applies only to the Great Lakes route. A full initial route is ordinarily six modules for Great Lakes and Inland or five for Inland, never both Rules modules as a universal seven-module exam.
The published guide specifies Q100 for Great Lakes and Inland. Inland applicants use Q100 unless they request Q300, and choosing Q300 produces a geographic COLREGS limitation on the credential. Weigh that restriction against your intended routes before requesting it.
An increase from Inland to Great Lakes and Inland requires Q312. If your existing credential has a COLREGS limitation, Q100 is additionally required. Confirm your exact requirements with the National Maritime Center before applying.
No. The six headings are module and topic groups, not percentage weights. Do not plan your study time around invented percentages; instead cover every published topic in the modules your route requires.
Those specifics should be verified directly with the NMC, since this guide does not assert contemporary figures. For general explanations, see NMUGI Passing Score 2026: Exactly What You Need to Pass and NMUGI Certification Cost 2026: Complete Pricing Breakdown, and always cross-check against official NMC sources.