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100+ Free USCG AB Special Practice Questions

Pass your USCG Able Seafarer-Special (National AB Special) exam on the first try — instant access, no signup required.

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When using oars in an open survival craft, the crewmember at the tiller (steering oar) should:

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ArticleFREE USCG OUPV Six-Pack Captain License Guide 2026: Pass First Try27 min read
2026 Statistics

Key Facts: USCG AB Special Exam

180

Sea-Service Days Required

46 CFR 12.401 (AB-Special)

150

Total Written Questions

USCG NMC deck-ratings exams

70%

Per-Module Passing Score

USCG NMC

$95

Examination Fee

NMC fee schedule

3.5 hrs

Max Time per Module

USCG sample exams

Jan 28, 2026

ASAP Portal Rollout

NMC ASAP notice

As of May 2026, the National Able Seafarer-Special endorsement under 46 CFR 12.401 still requires 180 days of qualifying deck service on any waters — the lowest tier of AB ratings (Unlimited requires 540 days; Limited requires 360 days on vessels over 100 GRT). The written exam is identical to the higher AB tiers: 150 questions across Q450 Rules/Navigation, Q451 Deck General/Safety, and Lifeboatman, each module passed at 70%, plus a knot-tying and lifeboatman practical demonstration. The main 2026 process changes for applicants are the Pay.gov fee-payment shift (Jan 19, 2025) and the ASAP application-portal rollout (Jan 28, 2026).

Sample USCG AB Special Practice Questions

Try these sample questions to test your USCG AB Special exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1On a 95-GRT towing vessel, who is responsible under Rule 5 for maintaining a proper lookout while you have the helm?
A.Only the master, even if asleep
B.Every vessel at all times, using sight, hearing, and all available means
C.Only the engineer on watch
D.Only the deckhand off-watch
Explanation: Rule 5 places the lookout duty on every vessel without exception. On small commercial vessels where the wheelhouse may be staffed by one person, the helmsman often functions as the lookout and must use sight, hearing, and all available means including radar and AIS.
2You are aboard a 60-GRT passenger vessel and observe a closing target whose compass bearing is not changing. Under Rule 7, what must you assume?
A.There is no risk because the bearing is steady
B.Risk of collision exists
C.The other vessel will always give way
D.The radar must be malfunctioning
Explanation: A nearly constant compass bearing with decreasing range is the classic Rule 7 indicator that collision risk exists. You must take early action under Rules 8, 16, or 17 as appropriate to your situation.
3On a small fishing vessel in restricted visibility, what additional factor does Rule 6 require you to consider when determining safe speed?
A.The fuel price at the next port
B.The state of wind, sea, current, and proximity of navigational hazards
C.The seniority of the deck crew
D.The vessel's hull color
Explanation: Rule 6(a) lists factors common to all vessels, including the state of wind, sea, current, and proximity of navigational hazards. These environmental factors directly affect how quickly a small vessel can stop or maneuver.
4Two power-driven vessels are meeting head-on. Under Rule 14, each vessel shall:
A.Hold course and speed until the last moment
B.Alter course to starboard so each passes on the port side of the other
C.Alter course to port to pass starboard-to-starboard
D.Stop engines and drift
Explanation: Rule 14 requires each power-driven vessel meeting head-on to alter course to starboard so that each passes on the port side of the other. This standardized maneuver prevents the dangerous indecision that causes head-on collisions.
5You are on a power-driven vessel and another power-driven vessel is approaching from your starboard quarter forward of your beam. Who is the give-way vessel under Rule 15?
A.The vessel approaching from starboard
B.Your vessel
C.Whichever is larger
D.Neither — both must hold course
Explanation: Rule 15 makes the vessel that has the other on its own starboard side the give-way vessel. Since the other vessel is on your starboard side, you must give way and, when possible, avoid crossing ahead.
6Under Rule 13, a vessel is considered overtaking another when approaching from more than how many degrees abaft the beam?
A.10 degrees
B.22.5 degrees
C.45 degrees
D.90 degrees
Explanation: Rule 13(b) defines overtaking as coming up on another vessel from a direction more than 22.5 degrees abaft her beam. This corresponds to the unbroken arc of her sternlight and removes any ambiguity about who must keep clear.
7Under International Rules, a power-driven vessel less than 50 meters underway must show which masthead light configuration?
A.One masthead light forward
B.Two masthead lights in a vertical line
C.Three all-around lights in a triangle
D.No masthead lights are required
Explanation: Rule 23 requires a power-driven vessel less than 50 meters in length to show at least one masthead light forward. A second masthead light aft is optional for vessels under 50 meters and mandatory only for vessels 50 meters or more.
8A small fishing vessel engaged in trawling shall show which day shape under Rule 26?
A.A single ball
B.Two cones with apexes together (one shape)
C.Three balls in a vertical line
D.A diamond
Explanation: Rule 26 requires a vessel engaged in trawling to display two cones with their apexes together in a vertical line by day, or a single shape that is the same form (commonly an hourglass shape). Other fishing vessels not trawling display the same shape unless they have gear extending more than 150 meters horizontally, which adds a cone pointing toward the gear.
9You hear a vessel sound one prolonged blast on the whistle. Under Rule 35, what does this signal mean when sounded from a power-driven vessel underway in restricted visibility?
A.I am altering course to starboard
B.I am operating astern propulsion
C.I am a power-driven vessel underway making way through the water
D.I am at anchor
Explanation: Rule 35(a) requires a power-driven vessel making way through the water in restricted visibility to sound one prolonged blast at intervals of not more than two minutes. A power-driven vessel underway but stopped sounds two prolonged blasts separated by about two seconds.
10Under Inland Rules, an overtaking situation in a narrow channel where the overtaken vessel must take action to permit safe passing is signaled by the overtaking vessel sounding:
A.One short blast for port, two for starboard
B.Two prolonged followed by one short or two short blasts
C.Five short and rapid blasts
D.Three short blasts
Explanation: Inland Rule 34(c) provides a signal of two prolonged blasts followed by one short blast (overtake on the starboard side) or two prolonged followed by two short blasts (overtake on the port side). The overtaken vessel signals agreement with the same signal.

About the USCG AB Special Exam

The USCG Able Seafarer-Special is the entry tier of AB ratings under 46 CFR 12.401, requiring only 180 days of qualifying deck service on any waters versus 540 for AB-Unlimited and 360 for AB-Limited. AB-Special is typically used aboard small commercial vessels under 100 GRT — fishing, towing, and small passenger operations. The written exam content is identical to the higher AB tiers and covers Rules/Navigation, Deck General/Safety, and Lifeboatman.

Assessment

Three written modules of 50 questions each: Q450 Rules of the Road/Navigation General, Q451 Deck General and Safety, and Lifeboatman. Each module requires 70% to pass. Knot-tying and lifeboatman practical demonstrations are administered separately.

Time Limit

Up to 3.5 hours per module

Passing Score

70% each module

Exam Fee

$95 exam fee; $240 total typical original application (U.S. Coast Guard National Maritime Center (NMC) / Regional Exam Centers)

USCG AB Special Exam Content Outline

33% module weight

Rules of the Road / Navigation General (Q450)

Lookout, risk of collision, safe speed, steering and sailing rules, lights and shapes, sound signals, narrow channels, restricted visibility, and basic small-vessel aids to navigation and piloting.

33% module weight

Deck General and Safety (Q451)

Marlinspike knots, mooring and anchoring scope, helmsman commands, ship construction terminology, stability and free-surface effect, firefighting classes, pollution reporting under 33 CFR 155, towing-vessel girting risk, and shipboard emergencies.

34% module weight

Lifeboatman

Survival craft operation, life rafts and hydrostatic release units, immersion suit donning, PFD types, EPIRB registration and use, SART, pyrotechnic distress signals, abandon-ship procedures, cold-water survival, and the required practical demonstration.

How to Pass the USCG AB Special Exam

What You Need to Know

  • Passing score: 70% each module
  • Assessment: Three written modules of 50 questions each: Q450 Rules of the Road/Navigation General, Q451 Deck General and Safety, and Lifeboatman. Each module requires 70% to pass. Knot-tying and lifeboatman practical demonstrations are administered separately.
  • Time limit: Up to 3.5 hours per module
  • Exam fee: $95 exam fee; $240 total typical original application

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

USCG AB Special Study Tips from Top Performers

1Lock in COLREGS/Inland steering and sailing rules first — they appear throughout the Q450 module and affect real-time helm responses on small vessels.
2Memorize lights, shapes, and sound signals as paired patterns rather than isolated facts; recognition under time pressure is the key Q450 skill.
3Practice knot-tying physically (bowline, square knot, clove hitch, round turn and two half hitches, sheet bend) — the practical demonstration is graded separately from the written exam.
4Drill life-raft launch and immersion-suit donning sequences mentally until the steps come automatically; many Lifeboatman questions test sequence and reasoning.
5Study small-vessel scenarios specifically — anchoring scope, towing-vessel girting, free-surface effect, and 33 CFR 155 pollution reporting are common Q451 topics.
6Learn the pyrotechnic and electronic distress signals together (EPIRB, SART, parachute flare, hand flare, orange smoke) and when each is most effective.
7Take timed sets of 50 questions to match the module rhythm and learn to skip and return rather than stalling on a single hard item.
8If you plan to upgrade to AB-Limited or AB-Unlimited later, the written content does not change — focus your study now and you bank the same material for those tiers.

Frequently Asked Questions

How is the AB-Special endorsement different from AB-Unlimited and AB-Limited?

All three are National Able Seafarer endorsements under 46 CFR 12.401 with the same written exam content. The difference is sea service: AB-Special needs 180 days on any waters, AB-Limited needs 360 days on vessels over 100 GRT in ocean/Great Lakes/near-coastal waters, and AB-Unlimited needs 540 days in those same waters. AB-Special is the entry tier and is typically used on small commercial vessels under 100 GRT.

How many questions are on the AB-Special exam?

Three written modules of 50 questions each — Q450 Rules of the Road/Navigation General, Q451 Deck General and Safety, and Lifeboatman — for 150 total written questions. Each module requires 70% to pass. You also complete a knot-tying and lifeboatman practical demonstration administered separately.

What sea service counts toward the 180 days?

46 CFR 12.403 accepts service on deck on vessels operating on any waters for the AB-Special tier, including waters not qualifying for AB-Limited or AB-Unlimited. On vessels under 100 GRT, a sea day typically requires at least 4 hours underway in a calendar day. Service must be documented on USCG-acceptable forms or company sea-service letters.

How much does the AB-Special exam cost?

The current NMC examination fee is $95. A typical original AB rating application costs around $240 total ($100 evaluation + $95 exam + $45 issuance), payable through Pay.gov.

Is the AB-Special exam available remotely?

No. USCG deck-rating examinations are administered in person at a Regional Examination Center (REC) after NMC approves the application, and the knot-tying and lifeboatman practical demonstrations also occur in person.

What changed for 2026 applicants?

The main 2026 process changes are the shift to Pay.gov for fee payments (effective Jan 19, 2025) and the launch of the NMC ASAP application portal on Jan 28, 2026. The 46 CFR 12.401 endorsement structure and the 150-question exam blueprint have not changed for 2026.

Do I need Lifeboatman to qualify for AB-Special?

Yes. Lifeboatman is required for all National Able Seafarer endorsements (Unlimited, Limited, and Special). You must pass the Lifeboatman written module at 70% and demonstrate knot-tying and lifeboatman practical competency.