Master of Unlimited Tonnage Practice Test (Great Lakes & Inland)

Command of the Great Lakes freighters and big inland ships of any size. Q306 Great Lakes Topics is only for a Great Lakes route. Coast Guard exam code GLI01.

281 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 Q305 Chart Plot 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. Which is the proper term used to describe a stream of water immediately surrounding a moving vessel's hull, flowing in the same direction as the vessel?

   • A.Forward current
   • B.Directional current
   • C.Propeller current
   • D.Wake current
   Show answer

   D. Wake current

   Q160, Deck General

3. What is the difference between net tonnage and gross tonnage?

   • A.Net tonnage is tonnage of cargo compared to tonnage of whole ship.
   • B.There is no difference.
   • C.Net tonnage is the net weight of the ship.
   • D.Net tonnage is the gross tonnage, less certain deductions for machinery and other areas.
   Show answer

   D. Net tonnage is the gross tonnage, less certain deductions for machinery and other areas.

   Q161, Deck Safety

4. The luminous range of a light takes into account which factor?

   • A.The glare from background lighting
   • B.The elevation of the light
   • C.The existing visibility conditions
   • D.The observer's height of eye
   Show answer

   C. The existing visibility conditions

   Q171, Navigation General: Near Coastal

5. When making way in heavy seas you notice that your vessel's screw is being lifted clear of the water and racing. Which action will correct the situation?

   • A.Decrease the vessel's speed
   • B.Shift more weight forward
   • C.Increase the vessel's speed
   • D.Shift the rudder back and forth several times
   Show answer

   A. Decrease the vessel's speed

   Q170, Deck General / Safety

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. You are docking a vessel. When are the wind and current most favorable in this situation?

   • A.When they are crossing your course, both in the same direction
   • B.When they are both setting you on the pier
   • C.When they are both parallel to the pier from ahead
   • D.When they are crossing your course, in opposite directions to the other
   Show answer

   C. When they are both parallel to the pier from ahead

   Q170, Deck General / Safety

9. When is firefighting foam most effective?

   • A.When it completely covers the top of the burning liquid
   • B.If it penetrates to the bottom of the fire
   • C.When it is kept saturated with low-velocity water fog
   • D.As it mixes with the burning fuel oil
   Show answer

   A. When it completely covers the top of the burning liquid

   Q161, Deck Safety

10. What does the prefix "nimbo" in a cloud's name mean?

    • A.It signifies middle or high-altitude clouds
    • B.It means rainy clouds
    • C.It means sheet or layer clouds
    • D.It means great vertical development
    Show answer

    B. It means rainy clouds

    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).