Master or Mate 100 Ton Practice Test: Great Lakes & Inland

The 100-ton ticket for inland waters. Coast Guard exam code GLI06.

251 real questions from the Coast Guard National Maritime Center's public sample exams, free. Rules of the Road needs 90%. Every other module needs 70%.

Passing score: Coast Guard pass marks module by module, and the retest rules

What's free: daily rounds, the Brig, the drills and the Pass Meter, for every license. Your first module test is free too. After that, the full Exam Room is $19, once. No subscription.

What's on the test

The Q350 Chart Plot (chart 13205 TR) module is done on a paper chart at the exam, so it isn't here. Practice it with the chart and tools.

10 sample questions

1. For the purpose of the Inland Navigation Rules, the term "Inland Waters" includes which of the following?

   • A.The coastline of the United States out to one mile offshore
   • B.The Great Lakes on the United States side of the boundary
   • C.The waters surrounding any islands of the U.S.
   • D.Any lakes within state boundaries
   Show answer

   B. The Great Lakes on the United States side of the boundary

   Q100, Rules of the Road: International & Inland

2. How should manila lines in which the strands are right-hand laid be coiled?

   • A.Manila line should be coiled in a clockwise direction
   • B.Manila line should be coiled in a counterclockwise direction
   • C.Manila line should never be coiled
   • D.Manila line may be coiled either clockwise or counterclockwise
   Show answer

   A. Manila line should be coiled in a clockwise direction

   Q160, Deck General

3. The water in which a vessel floats provides vertical upward support. Which term is regarded as the point through which this support is assumed to act?

   • A.The center of gravity
   • B.The center of effort
   • C.The center of buoyancy
   • D.The center of flotation
   Show answer

   C. The center of buoyancy

   Q161, Deck Safety

4. You sight a buoy fitted with a double-sphere topmark. If sighted at night, what color and light sequence would you expect to see?

   • A.A flashing red light showing a group of three flashes
   • B.A quick-flashing green light
   • C.A flashing white light showing a group of two flashes
   • D.A quick-flashing red light
   Show answer

   C. A flashing white light showing a group of two flashes

   Q171, Navigation General: Near Coastal

5. Unless extremely flexible wire rope is used, the sheave diameter should always be as large as possible. Which is the Coast Guard rule for correct sheave diameter?

   • A.10 times the wire rope diameter
   • B.Match the rope diameter
   • C.20 times the wire rope diameter
   • D.2 times the wire rope diameter
   Show answer

   C. 20 times the wire rope diameter

   Q160, Deck General

6. A law enforcement vessel patrolling a marine regatta may exhibit a flashing blue light or which of the following alternates?

   • A.two amber lights in a horizontal line
   • B.a fixed green light over a red flashing light
   • C.a high intensity flashing white light (strobe)
   • D.an alternately flashing red and yellow light
   Show answer

   D. an alternately flashing red and yellow light

   Q100, Rules of the Road: International & Inland

7. In fog you observe your radar and determine that risk of collision exists with a vessel which is 2 miles off your port bow. Which action should you take?

   • A.Take avoiding action as soon as possible
   • B.Sound five short and rapid blasts at two-minute intervals
   • C.Hold course and speed until the other vessel is sighted
   • D.Stop your engines
   Show answer

   A. Take avoiding action as soon as possible

   Q100, Rules of the Road: International & Inland

8. Which is an advantage of nylon rope over manila rope?

   • A.Can be stored on decks exposed to sunlight
   • B.Can hold a load even when a considerable amount of the yarns have been abraded
   • C.Can be used in conjunction with wire or spring-lay rope
   • D.It gives an audible warning of overstress whereas manila does not
   Show answer

   B. Can hold a load even when a considerable amount of the yarns have been abraded

   Q160, Deck General

9. What will happen when cargo is shifted from the main deck into the lower hold of a vessel?

   • A.The metacenter will move upward.
   • B.The GM will increase.
   • C.The center of buoyancy will move upward.
   • D.All of the above
   Show answer

   B. The GM will increase.

   Q161, Deck Safety

10. Which is TRUE concerning compass error?

    • A.Compass error is the difference between true and magnetic heading
    • B.Compass error is variation plus compass course
    • C.Compass error is the sum of variation and deviation
    • D.Compass error is equal to deviation minus variation
    Show answer

    C. Compass error is the sum of variation and deviation

    Q171, Navigation General: Near Coastal

What the study guide does

• Short daily rounds of 10 questions, with a streak.
• Practice tests built like the real one, scored with the real pass marks (first one free, then $19 once for the full Exam Room).
• The Brig: questions you miss come back until you get them right twice.
• Pass Meter: your chance of passing every module if you sat it today, worked out from your own answers.
• Lights, shapes and sound signal drills (Rules 21-35).