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USCG 100-Ton Master Practice Test

576 100-Ton Master questions from 6 of the National Maritime Center’s published sample exams, each with the NMC’s answer key, across 6 subjects. Questions that need an illustration, a chart or a reference book are left out.

The Rules of the Road questions are the NMC's deck officer Rules of the Road exam: 46 CFR 11.910 lists the Inland Navigational Rules as an exam subject for this endorsement, and the COLREGS unless the endorsement is limited to non-COLREGS waters.

422 of them come with the closest regulation or reference section, shown with the answer.

Take a quiz of 10 drawn at random, or read the 10 sample questions and answers below.

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10 at random from all 576, with each answer as soon as you pick.

10 sample 100-Ton Master questions with answers

The same 10 on every visit. A related section is the closest match RegKnot found in the regulations and references; it is not part of the NMC’s answer key.

  1. Question 1 · OUPV to Master Less than 100 Gross Registered Tons

    A magnetic compass card is marked in how many degrees?

    • A.90
    • B.180
    • C.360 (correct answer)
    • D.400

    Answer: C. 360

    Further reading: Bowditch Art.918 — Bowditch Ch.9 Compasses — 918. The Compass and the Binnacle

  2. Question 2 · OUPV to Master Near Coastal

    Which portable fire extinguisher is required just outside the exit of the propulsion machinery space of a 75-ton passenger vessel?

    • A.One B-II, C-II or post 2017 One 40-B:C extinguisher (correct answer)
    • B.One A-II or post 2017 One 2-A extinguisher
    • C.One B-I or post 2017 One 10-B extinguisher
    • D.None of the above

    Answer: A. One B-II, C-II or post 2017 One 40-B:C extinguisher

    Related regulation: 46 CFR 34.50-10 — Location, number, and installation of fire extinguishers—TB/ALL

  3. Question 3 · Master Less than 100 Gross Registered Tons

    For small angles of inclination, if the KG were equal to the KM, which is TRUE concerning the vessel?

    • A.The vessel possesses neutral stability (correct answer)
    • B.The vessel possesses negative stability
    • C.The vessel possesses maximum stability
    • D.The vessel possesses positive stability

    Answer: A. The vessel possesses neutral stability

    Related regulation: NVIC 03-89 Encl.1 §7 — Guidelines for the Presentation of Stability Information for Operating Personnel — Enclosure (1): METHODS TO SIMPLIFY CALCULATIONS IN A TRIM AND STABILITY BOOKLET.

  4. Question 4 · OUPV to Master Near Coastal

    On a small passenger vessel, 58 feet in length, carrying 52 passengers the fire pump shall have a minimum pumping capacity of how many gallons per minute?

    • A.10 gallons per minute
    • B.100 gallons per minute
    • C.25 gallons per minute
    • D.50 gallons per minute (correct answer)

    Answer: D. 50 gallons per minute

    Related regulation: 46 CFR 169.559 ↗ — Fire pumps

  5. Question 5 · Master Less than 100 Gross Registered Tons Rivers

    When passing a moored vessel in a narrow channel which actions will help minimize wake damage?

    • A.Reduce speed and make a notation in the bell book (correct answer)
    • B.Go half astern when abeam of the moored vessel
    • C.Check the rudder several times while passing the vessel
    • D.Stay on outside of channel and make a notation in the logbook

    Answer: A. Reduce speed and make a notation in the bell book

    Related regulation: 33 CFR 83.09 ↗ — Narrow channels (Rule 9)

  6. Question 6 · Master Near Coastal Less than 100 Gross Registered Tons

    A person who observes an individual fall overboard should do which of the following?

    • A.Immediately jump into the water to assist the individual
    • B.Go to the control room for the distress flares
    • C.Call for help and keep the individual in sight (correct answer)
    • D.Run to the radio room to send an emergency message

    Answer: C. Call for help and keep the individual in sight

    Related regulation: NVIC 07-98 Encl.1 — The International Maritime Organization Standard Marine Communication Phrases — Enclosure (1)

  7. Question 7 · Master Less than 100 Gross Registered Tons

    Buoyant apparatus are required to be fitted or equipped with all of the following equipment EXCEPT which item? (small passenger vessel regulations)

    • A.Paddles (correct answer)
    • B.Life lines
    • C.Water lights
    • D.Painters

    Answer: A. Paddles

    Related regulation: 46 CFR 160.010-3 ↗ — Inflatable buoyant apparatus

  8. Question 8 · Master Near Coastal Less than 100 Gross Registered Tons

    When a vessel is required to have a power-driven fire pump, the pump may also be used for which task? (small passenger vessel regulations)

    • A.The drinking water supply system
    • B.The engine cooling water
    • C.The bilge pump (correct answer)
    • D.None of the above

    Answer: C. The bilge pump

    Related regulation: 46 CFR 182.520 ↗ — Bilge pumps

  9. Question 9 · Master Less than 100 Gross Registered Tons

    According to the Lifesaving regulations in Subchapter W, fire and abandon ship drills must be held within 24 hours of leaving port if the percentage of the crew that has not participated in drills aboard that particular vessel in the prior month exceeds which percentage?

    • A.5%
    • B.10%
    • C.25% (correct answer)
    • D.40%

    Answer: C. 25%

    Related regulation: 46 CFR 199.180 — Training and drills

  10. Question 10 · Deck Officer Endorsements

    BOTH INTERNATIONAL & INLAND The stern light shall be positioned such that it will show from dead astern to how many degrees on each side of the stern of the vessel?

    • A.22.5°
    • B.67.5° (correct answer)
    • C.112.5°
    • D.135.0°

    Answer: B. 67.5°

    Related regulation: COLREGs Annex I — Positioning and Technical Details of Lights and Shapes

Exams these questions come from

Choose one when you start the quiz. A question can appear in more than one exam, so these add up to more than 576.

  • Master Less than 100 Gross Registered Tons165 questions
  • Master Less than 100 Gross Registered Tons Rivers108 questions
  • Master Near Coastal Less than 100 Gross Registered Tons143 questions
  • OUPV to Master Less than 100 Gross Registered Tons49 questions
  • OUPV to Master Near Coastal48 questions
  • Rules of the Road (Deck Officer Endorsements)80 questions

Subjects these questions cover

Each subject has its own practice page, with questions from every exam that covers it.

Requirements for the endorsement

More USCG practice tests

The questions and answer keys are from the U.S. Coast Guard National Maritime Center’s published sample exams. RegKnot is not affiliated with the U.S. Coast Guard or the National Maritime Center. A practice score does not predict your exam result; check the NMC for current exam requirements.