- What This Cheat Sheet Covers (and What It Doesn't)
- The Credential at a Glance
- Four-Domain Map
- Deck General: Terms, Lines, and Seamanship
- Navigation General: Rules, Signals, and Reading the Water
- Safety: Firefighting, Emergencies, and Pollution
- Lifeboatman and Deck Skills: Survival Craft and Boat Handling
- What to Verify Before Test Day
- A Domain-Ordered Review Sequence
- FAQ
- The National Able Seaman (A/B) credential is governed by the U.S. Coast Guard National Maritime Center, not a private testing body.
- Content falls into four domains: Deck General, Navigation General, Safety, and Lifeboatman and Deck Skills.
- Official source material emphasizes nautical terms, signals, boat handling, safety, and related deck skills.
- Exact fee, question total, timer, pass rate, and weighted domains were not verified as one current blueprint, so confirm with the NMC.
What This Cheat Sheet Covers (and What It Doesn't)
A good cheat sheet is not a substitute for study. It is a compression tool: the facts you already understand, boiled down to a form you can scan in minutes. This page is built for the National Able Seaman (A/B) credential, the deck rating issued under U.S. Coast Guard authority. If you are still deciding whether to pursue it, start with What Is USCG-A/B? and then return here once you are committed.
One honesty note up front. The official source material for this credential supports a clear picture of the competency areas: nautical terms, signals, boat handling, safety, and related deck skills. What it does not give us is a single, current, verified blueprint with an exact question count, timer, pass rate, or domain weighting. This article therefore does not invent those numbers. Where a fact needs confirming, we say so and tell you where to look.
The Credential at a Glance
| Item | What We Can Say |
|---|---|
| Credential | National Able Seaman (A/B) |
| Governing body | United States Coast Guard National Maritime Center (NMC) |
| Rules framework | USCG regulations and NMC examination requirements |
| Content areas | Deck General, Navigation General, Safety, Lifeboatman and Deck Skills |
| Skill emphasis | Nautical terms, signals, boat handling, safety, related deck skills |
| Exact fee, question total, timer, pass rate, domain weights | Not verified as a single current blueprint; confirm with the NMC |
Because this is a Coast Guard credential, the authoritative answers on eligibility, sea-service documentation, and fees live with the NMC and in the regulations, not in any third-party summary. For the eligibility side, see USCG-A/B Requirements 2026: Eligibility, Prerequisites & How to Qualify, and for money questions, USCG-A/B Certification Cost 2026: Complete Pricing Breakdown.
Four-Domain Map
Think of the exam content as four buckets. The names below are the ones this site uses to organize preparation; the full treatment is in USCG-A/B Exam Domains 2026: Complete Guide to All 4 Content Areas.
| Domain | Think of It As | Memory Hook |
|---|---|---|
| Deck General | The vocabulary and daily work of the deck department | "Name it, tie it, handle it" |
| Navigation General | Rules, signals, and the picture of the water around you | "See it, signal it, avoid it" |
| Safety | Preventing and responding to emergencies aboard | "Alarm, act, abandon if needed" |
| Lifeboatman and Deck Skills | Survival craft and hands-on boat handling | "Launch, lead, survive" |
Deck General: Terms, Lines, and Seamanship
Deck General is where the language of the job lives. Official source material for this credential emphasizes nautical terms, so treat vocabulary as foundational. If you cannot instantly separate bow from stern, port from starboard, or a mooring line from an anchor rode, every other domain gets harder.
Deck General: Cheat-Sheet Targets
Be able to define and use the core vocabulary of vessel structure and deck work without hesitation.
- Parts of the vessel and directional terms (bow, stern, port, starboard, fore, aft, abeam)
- Deck gear and its purpose: lines, cleats, bitts, chocks, winches, windlasses, anchors
- Line handling and common knots, including which knot suits which job
- Mooring and anchoring basics, including how a vessel is secured alongside
- Safe working practices on deck, including care of lines under strain
How to Compress This Domain
Build a two-column list: term on the left, plain-language meaning on the right. Then add a third column for "where you would see this on a real deck." That third column converts rote memory into recognition, which is what scenario-style questions reward. Keep a separate short list of knots with one line each: what it does, when you would use it, and when it is the wrong choice.
Navigation General: Rules, Signals, and Reading the Water
Official source material highlights signals as a core competency area, and this domain is where they live. As an Able Seaman you are not the master, but you stand watch, act as lookout, and steer. Knowing the rules of the road and what signals mean is part of doing that competently.
Navigation General: Cheat-Sheet Targets
Focus on the knowledge a watchstander needs in order to recognize what is happening around the vessel and respond correctly.
- Lookout duties: what to report, to whom, and how to describe a contact's bearing
- Sound signals and light signals, including what each is telling you
- Navigation lights and shapes: recognizing vessel type and aspect from what you see
- Buoys and aids to navigation: the basics of reading channel markers
- Compass and steering terms, including helm orders and the correct repeat-back habit
- Basic right-of-way concepts under the rules of the road
Signals Are a Pattern Game
Signals are best learned as sets, not isolated items. Group sound signals together, light configurations together, and flag or visual signals together. Then quiz yourself in both directions: given the signal, what does it mean; given the meaning, what is the signal. Candidates who only practice one direction often discover the gap on test day.
Safety: Firefighting, Emergencies, and Pollution
Safety is the domain where wrong answers have the most real-world cost, and it is explicitly part of the competency areas supported by official source material. Expect to need both knowledge of equipment and knowledge of sequences: what you do first, what you do next, and what you never do.
Safety: Cheat-Sheet Targets
Know the equipment, the alarms, and the order of response for the major shipboard emergencies.
- Fire prevention and firefighting: classes of fire and which extinguishing agent fits which class
- Emergency signals and alarms, and what your station duty is when each sounds
- Man-overboard response: the immediate actions and the information to relay
- Abandon-ship procedures and the logic of the muster list and station bill
- Personal protective equipment and safe work practices for enclosed spaces and heavy lifting
- Pollution prevention basics and why discharge rules exist
- Basic first aid priorities aboard a vessel
Sequences Beat Lists
For emergencies, memorize steps in order. A good cheat-sheet entry reads like a short procedure: "Discover, alert, report, respond." If an answer choice lists correct actions in the wrong order, it is often the trap. Rehearse each emergency aloud as a three- or four-step chain until you can say it without looking.
Key Takeaway
For every emergency on your list, write the first action, the person you notify, and the one action you must never take. Those three items cover the majority of what a safety question is really probing.
Lifeboatman and Deck Skills: Survival Craft and Boat Handling
This domain pulls together the hands-on knowledge behind lifeboat operation and general boat handling. Official source material names boat handling as a distinct competency, and the lifeboatman element means you should understand survival craft as a system, not just as a piece of equipment hanging on davits.
Lifeboatman and Deck Skills: Cheat-Sheet Targets
Understand how survival craft are prepared, launched, operated, and used to keep people alive until rescue.
- Parts of a lifeboat and its required equipment
- Launching and recovery: the logic of davits, falls, and release gear, and what can go wrong
- Handling a survival craft in heavy weather and in the water after launch
- Survival priorities: protection from exposure, signaling for rescue, rationing, and morale
- Life rafts and inflatable devices: deployment and boarding principles
- Rescue-boat basics and recovering a person from the water
- Personal flotation and immersion protection concepts
Think Like the Person in Charge of the Boat
Lifeboat questions reward candidates who understand why each step exists. Why is the painter handled the way it is? Why does the order of boarding matter? When you know the reasoning, you can handle an unfamiliar phrasing without panic. If you want a broader view of how these skills connect to employment, see USCG-A/B Jobs and USCG-A/B Training.
What to Verify Before Test Day
This is the section most cheat sheets get wrong, because they print numbers with confidence. For the National Able Seaman (A/B) credential, several logistics were not verified as a single current blueprint, so they belong on your personal checklist rather than on a printed "fact" line.
| Item to Confirm | Where to Confirm |
|---|---|
| Exact exam fee and evaluation or issuance charges | NMC fee schedule and your regional exam center |
| Number of questions and time allowed | NMC examination information for the endorsement you are seeking |
| Passing score and how it is applied | NMC guidance; background in USCG-A/B Passing Score 2026 |
| Testing locations, dates, and scheduling method | NMC and exam center; background in USCG-A/B Exam Dates 2026 |
| Sea-service and documentation requirements | USCG regulations and NMC application instructions |
A Domain-Ordered Review Sequence
If you are building a short, final review plan, order it by how the domains build on each other rather than by convenience. Vocabulary first, then rules, then emergencies, then survival craft. Each stage uses language and ideas from the one before it.
Deck General
- Build your term list and knot list
- Match each piece of deck gear to its job
- Practice directional and vessel-part terms until instant
Navigation General
- Group signals into sound, light, and visual sets
- Drill lookout reporting and helm-order wording
- Review buoys, lights, and right-of-way basics
Safety
- Write each emergency as an ordered procedure
- Match fire classes to extinguishing agents
- Review station bill and muster logic
Lifeboatman and Deck Skills
- Walk through launch, handling, and survival priorities
- Revisit weak spots from earlier weeks
- Finish with mixed-domain practice questions
The reasoning behind this order is simple: Safety and Lifeboatman questions assume you already speak the language of Deck General, and Navigation vocabulary shows up everywhere. For a fuller plan, see USCG-A/B Study Guide 2026: How to Pass on Your First Attempt. When you want to test yourself under realistic conditions, use the USCG-A/B practice tests and review every miss by domain.
Turning Missed Questions into Cheat-Sheet Lines
The most valuable cheat sheet is the one you build from your own errors. After each practice session on the main practice test site, tag every missed question with its domain and write a single sentence that would have gotten it right. Those sentences become your final one-page review. Patterns appear fast: some candidates find they miss signal questions because they memorized meanings but not appearances; others find they confuse emergency sequences.
- Vocabulary misses: add the term and a plain-language definition to your Deck General list.
- Signal misses: add the signal and its meaning to the correct set, then quiz both directions.
- Sequence misses: rewrite the procedure in order and recite it aloud.
- Reasoning misses: write why the correct answer is correct, not just what it is.
Why the Rating Is Worth Knowing Cold
An Able Seaman rating is a working credential. Employers in the deck department want people who can stand a watch, handle lines, and act correctly in an emergency without being told twice. That is exactly what the four domains test. If you are weighing the investment, Is the USCG-A/B Certification Worth It? and USCG-A/B Salary Guide 2026 cover the career and earnings side without leaning on unverified figures, and USCG-A/B Certification gives the broader overview.
FAQ
The United States Coast Guard National Maritime Center governs it, with requirements set by USCG regulations and NMC examination requirements.
Deck General, Navigation General, Safety, and Lifeboatman and Deck Skills. Official source material supports competency in nautical terms, signals, boat handling, safety, and related deck skills.
The exact question total and timer were not verified as a single current blueprint. Confirm both with the NMC or your exam center before test day rather than trusting an unofficial number.
The exact fee, pass rate, and weighted domain percentages were not verified as a single current blueprint. Check the NMC fee schedule and examination guidance for current figures.
Keep it to terms and knots, signal sets, emergency sequences, and survival-craft priorities, organized by the four domains. Build most of it from your own missed practice questions.