ONC06 - Master LT 100 GRT

INLAND ONLY Which term is NOT defined in the Inland Navigation Rules?

Which term defines the strainer at the bottom of a bilge suction pipe to prevent clogging?

A vessel behaves as if all of its weight is acting downward through the center of gravity, and all its support is actin...

While on a course of 349°T, a light bears 13° on your starboard bow at a distance of 10.8 miles. What course should you...

You are on course 087° per standard magnetic compass (psc) when you take the following bearings: Falkner Island Light -...

Your vessel has a gasoline engine and a mechanical exhaust ventilation system. BEFORE starting the engine. How long do ...

INLAND ONLY Which of the following may be displayed by a law enforcement boat?

You are preparing to slush a stay on your vessel by lowering yourself down the stay in a bosun's chair. The proper way ...

How is the important stability parameter, KG, defined?

Your vessel is on a course of 082°T at 19 knots. At 0255 a light bears 059.5°T, and at 0312 the light bears 037°T. A...

Your engines are making turns for 8 knots, and a northerly wind is causing 3° of leeway. There is a current of 220°T at...

Which is TRUE concerning hatches on small passenger vessels operating on exposed waters and exposed to the weather?

INLAND ONLY Which of the following is indicated by a vessel displaying a flashing blue light?

A nylon line is rated at 15,000 lbs. breaking strain. Using a safety factor of 5, what is the safe working load (SWL)?

Deballasting a double bottom has what effect on KG?

You are steering 115°T, and a light is picked up dead ahead at a distance of 16.7 miles at 0522. You change course to p...

Your vessel is steady on a heading of 160° per standard magnetic compass when you sight Southwest Ledge Light and New H...

Which statement is TRUE concerning the number of portable fire extinguishers required at the operating station of a sma...

BOTH INTERNATIONAL & INLAND By definition which vessel is unable to keep out of the way of another vessel?

Which knot shown in illustration D030DG below represents a square knot?

On a vessel, which information can be obtained by multiplying a load's weight by the distance of the load's center of g...

Your vessel is steering a course of 337°psc. Variation for the area is 13°W, and deviation is 4°E. The wind is from the...

According to the U.S. Coast Pilot, what is the depth of the channel between State Pier No. 1 and the U.S. Navy Submarin...

When must the Master of a small passenger vessel fitted with loading doors ensure that the doors are closed, watertight...

BOTH INTERNATIONAL & INLAND A vessel that is defined as "restricted in her ability to maneuver" is unable to keep out o...

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

Which factor has the greatest effect on the value of the free surface correction?

You are steaming on course 126°T at 14.8 knots. At 1022 you sight a buoy bearing 128°T, at a range of 4.8 miles. If you...

NOAA Weather Broadcasts for the New London area may be received by turning your radio to which of the following frequen...

Which statement is true regarding the forecastle card?

INTERNATIONAL ONLY You intend to overtake a vessel in a narrow channel on its port side. The vessel to be overtaken has...

Which is an advantage of nylon rope over manila rope?

The effect of free surface on initial stability depends upon which item(s)?

You wish to make good a course of 035°T while turning for an engine speed of 12 knots. The set is 340°T, and the drift ...

At 0829 your position is LAT 41°02.9'N, LONG 72°57.4'W. You are making turns for 8.5 knots. What is your ETA at a posit...

What is the difference between net tonnage and gross tonnage?

INTERNATIONAL ONLY You are operating a vessel in a narrow channel. Your vessel must stay within the channel to be navig...

In illustration D044DG below, what is the mooring line labeled "H" called?

During cargo operations, your vessel develops a list due to the center of gravity rising above the transverse metacente...

What should you apply to a fathometer reading to determine the depth of water?

Your present position is LAT 41°05.5'N, LONG 72°38.0'W. Assuming that there is no set and drift, what course must you s...

You are planning to anchor in an area where several anchors have been lost due to fouling. What precaution should you t...

BOTH INTERNATIONAL & INLAND In which situation do the Rules require both vessels to change course?

What size sheave diameter should be used with a 3-inch manila line?

What is Metacentric height a measure of?

Which of the following statements is TRUE regarding automatic identification systems (AIS)?

You are planning to anchor your vessel at LAT 41°01.1'N, LONG 73°02.8'W. What type of bottom should you expect at this ...

Who carries the total responsibility for shipping and discharging the seamen on a vessel?

BOTH INTERNATIONAL & INLAND When two power-driven vessels are meeting head-on and there is a risk of collision, which a...

Which is described as a wedge of water building up between the bow and the nearer bank which forces the bow out and awa...

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

Which level of accuracy can be obtained utilizing the U.S. Coast Guard's Maritime Differential GPS in an established co...

At 1825 your GPS position is LAT 41°04.9'N, LONG 72°42.1'W. You are on course 085° per standard magnetic compass at a s...

Your vessel is discharging containers from the main deck with the ship's cranes. Which of the following must be taken i...

BOTH INTERNATIONAL & INLAND Vessel "A" is overtaking vessel "B" as shown in illustration D017RR below. Vessel "B" shoul...

You observe a V-shaped ripple with the point of the V pointing upstream in a river. What may this indicate?

Aboard a vessel, dividing the sum of the transverse moments by the total weight yields the vessel's __________.

While steaming on course 280°T, you sight a buoy showing a very quick flashing (VQ) white light well to port. Maintaini...

At 1018 your position is LAT 41°14.4'N, LONG 72°07.2'W. At 1036 your vessels position is LAT 41°13.1'N, LONG 72°16.1'W....

A SOLAS passenger ship safety certificate is required on which vessel?

BOTH INTERNATIONAL & INLAND Which is TRUE of a power-driven stand-on vessel?

A vessel traveling down a narrow channel, especially if the draft is nearly equal to the depth of the water, may set of...

When a vessel has positive stability, which term is used to describe the distance between the line of force through B a...

Under the U.S. Aids to Navigation System, a special mark possesses which of the following characteristics?

Who shall test every small passenger vessel's steering gear prior to getting underway for the day's operations?

BOTH INTERNATIONAL & INLAND You hear the fog signal of another vessel forward of your beam. Risk of collision may exist...

You are proceeding in a channel, your vessel is requiring a significant amount of right rudder and your bow is still fa...

Which term represents the weight (measured in tons) required to cause a change in mean draft of one inch?

How are buoys which mark isolated dangers painted?

A breeches buoy is being rigged from the shore to a stranded vessel. The initial shot line passed to the vessel is norm...

BOTH INTERNATIONAL & INLAND You are underway in heavy fog. You hear the fog signal of a vessel which is somewhere ahead...

Which term describes the opening in the deck that leads the anchor cable outside the hull?

Aboard a vessel, what does dividing the sum of the longitudinal moments by the total weight yield?

If the main channel under a bridge is marked with lights of the lateral system how are the adjacent bridge piers marked...

Which information is contained on a Certificate of Inspection issued to a small passenger vessel?

BOTH INTERNATIONAL & INLAND You are underway in restricted visibility. You hear the fog signal of another vessel about ...

How does a drift lead indicate that the vessel is dragging anchor?

In illustration D033DG below, what is the joint indicated by letter D?

A drawbridge may use visual signals to acknowledge a vessel's request to open the draw. Which signal indicates that the...

What is the danger to personnel associated with using carbon dioxide in an enclosed space?

BOTH INTERNATIONAL & INLAND Which vessel is the stand-on vessel when two vessels crossing in fog are NOT in sight of on...

You are using the anchor to steady the bow while maneuvering. When do you know you have the proper scope of anchor cabl...

Regulations define the bulkhead deck as __________. (subdivision and stability regulations)

On a chart, the characteristic of the light on a lighthouse is shown as flashing white with a red sector. Which is TRUE...

Which is TRUE of the term coastal current?

BOTH INTERNATIONAL & INLAND The steering and sailing rules for vessels in restricted visibility apply to vessels ______...

When is the best time to work a boat into a slip?

What does the term "beam of a vessel" refer to?

Determine the approximate geographic visibility of an object, with a height above the water of 85 feet (25.9 meters), f...

You are heading into the sea during rough weather. What may happen if there is too much weight forward in your small bo...

INTERNATIONAL ONLY Which light(s) shall a single vessel being towed alongside show?

You are 15 feet off a pier and docking a vessel using only a bow breast line and stern breast line. Once the slack is o...

What does the gross tonnage of a vessel indicate?

A chart with a scale of 1:80,000 would fall into which category?

Which is the BEST action to take if your vessel is dragging her anchor in a strong wind?

INTERNATIONAL ONLY You have sighted three red lights in a vertical line on another vessel dead ahead at night. Which ve...

If your propeller is racing in rough weather, which action should you take?

You discover a leak in the fuel line to the engine. Which action should you take FIRST?

Which defines the term charted depth?

Which is TRUE concerning fixed ballast, on small passenger vessels?

BOTH INTERNATIONAL & INLAND In which situation would risk of collision definitely exist?

Your vessel is off a lee shore in heavy weather and laboring. Which action should you take?

Which action should be taken once fueling has been completed?

Which information does the outer ring of a compass rose on a nautical chart provide?

When a small craft's anchor fouls in a rocky bottom, how should the first attempt to clear it be made?

BOTH INTERNATIONAL & INLAND You are on Vessel "A" engaged in fishing in a narrow channel as shown in illustration D037R...

Which term defines when a boat turns broadside to heavy seas and winds, thus exposing the boat to the danger of capsizi...

Which is TRUE concerning a fuel-air mixture below the lower flammable limit?

What is indicated when slanted letters are used to spell the name of a charted object?

Fire hose should be washed with __________.

BOTH INTERNATIONAL & INLAND When in sight of another vessel and there is sufficient sea room, any action taken to avoid...

Most of your vessel's superstructure is forward. How will the vessel lie when drifting with no way on?

Which is TRUE of paints and solvents on a vessel?

Which publication would describe the explosive anchorages in the ports on the east coast of the United States?

As appropriate for the voyage, according to small passenger vessel regulations, all vessels must carry which adequate a...

BOTH INTERNATIONAL & INLAND A traffic separation zone is that part of a traffic separation scheme which __________.

Which expresses the term leeway?

How can the spread of fire be prevented?

Which agency publishes the Light Lists?

Which statement is TRUE concerning fire hose on a small passenger vessel?

BOTH INTERNATIONAL & INLAND When do the Rules state that risk of collision shall be deemed to exist?

Who is responsible for any wake damage caused by a passing vessel?

A burning pile of dunnage would be which classification of fire?

What is the most important source of information to be used in correcting charts and keeping them up to date?

On small passenger vessels how many supply and exhaust ducts are required in each enclosed space containing gasoline po...

INTERNATIONAL ONLY A wing in ground (WIG) craft cannot comply with the spacing requirement for masthead lights. What is...

The possibility of wake damage can be reduced by following which action?

Which extinguishing agent is/are suitable to combat a class B fire in an engine compartment?

The chart indicates the variation was 3°45'E in 1988, and the annual change is increasing 6'. If you use the chart in 1...

Aboard small passenger vessels the number of children's life jackets carried must be at least what percentage of the to...

INLAND ONLY The masthead light may be located at other than the fore and aft centerline on which power- driven vessel?

Which statement is TRUE concerning the placard entitled "Discharge of Oil Prohibited"?

What is the most important characteristic of the extinguishing agent in fighting a class "C" fire?

To find a magnetic compass course from a true course what must you apply?

What provides little or no indication that a vessel is dragging anchor?

INLAND ONLY Which statement is TRUE concerning lighting requirements for Great Lakes vessels?

Which term(s) are in the category of "oil" as used in the Oil Pollution Regulations?

A magnesium fire is classified as class __________.

What is an advantage of the magnetic compass aboard vessels?

Who is responsible for establishing watches aboard a U.S. vessel?

INLAND ONLY A power-driven vessel when pushing ahead or towing alongside on the Western Rivers (above the Huey P. Long ...

The Federal Water Pollution Control Act requires the person in charge of a vessel to immediately notify the Coast Guard...

When the handle of an all-purpose nozzle is pulled all the way back, it will __________.

Your vessel is proceeding up a channel, and you see a pair of range lights that are in line dead ahead. The chart indic...

You have completed stability calculations for your vessel prior to getting underway. Your vessel's GM is small but posi...

INLAND ONLY Vessels "A" and "B" are meeting on a river as shown in illustration D041RR below and will pass 1/4 mile apa...

Regardless of local requirements, when in a U.S. port, all oil spills must be reported to which of the following agenci...

In order to discharge a CO2 portable fire extinguisher, the operator must FIRST take which action?

What does a steep barometric gradient indicate?

When rendering assistance to personnel in the water a SAR helicopter utilizes a rescue sling for most extractions. In w...

INLAND ONLY A barge more than 50 meters long is required to show how many white anchor lights when anchored in a Secret...

To determine the number of inflatable liferafts required on a vessel, you should check which document?

Which is one of the limitations of foam as an extinguishing agent?

What benefit is a weather bulletin to a mariner?

Which term defines the ocean bottom that extends from the shoreline out to an area where there is a marked change in sl...

BOTH INTERNATIONAL & INLAND You see ONLY the light shown in illustration D080RR below. Which type of vessel are you obs...

What is the minimum size required before a vessel can be documented?

If you must swim through an oil fire, which action should be avoided?

Which kind of conditions would you observe as the eye of a storm passes over your vessel's position?

Which portable fire extinguisher is required just outside the exit of the propulsion machinery space of a 75-ton passen...

BOTH INTERNATIONAL & INLAND A vessel displaying the shape shown in illustration D010RR below is which of the following?

On the cargo manifest, which term is used to describe the weight of the cargo inside a box?

If you have to jump in the water when abandoning ship, your legs should be in which position?

Which indication on the barometer is most meaningful in forecasting weather?

What shall be conducted during a fire and boat drill?

BOTH INTERNATIONAL & INLAND Which of the following describes a vessel exhibiting the lights shown in illustration D084R...

What is the name of the mark indicated by the letter A in illustration D003DG below?

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

Which of the listed properties does warm air possess?

What is the minimum height of rails on passenger decks of ferryboats, excursion vessels, and vessels of a similar type?...

BOTH INTERNATIONAL & INLAND The stern light shall be positioned such that it will show from dead astern to how many deg...

Periodic surveys to renew the load line assignment must be made at which interval?

All personnel on board a vessel should be familiar with the rescue boat's __________.

A weather forecast states that the wind will commence backing. What does this indicate if you are in the Northern Hemis...

Which may cause above-normal tides near the center of a hurricane?

BOTH INTERNATIONAL & INLAND Which is TRUE of a tugboat displaying the shape shown in illustration D010RR below?

When an Official logbook is not required, an unofficial logbook is required to be kept aboard for review by a marine in...

A situation has occurred where it becomes necessary for you to be towed. What action should be taken to prevent your ve...

According to Buys Ballot's law, when an observer in the Northern Hemisphere experiences a northwest wind, where is the ...

Vessels operating in warm water whose routes are restricted to 20 miles from a harbor of safe refuge shall carry life f...

INLAND ONLY What signal is a power-driven vessel, when leaving a dock or berth, required to sound?

What is the period of validity of a Merchant Mariner Credential?

If you have a fire in the engine room, what is the FIRST action you should take?

Which are associated with Cumulonimbus clouds?

What is the mechanical advantage of tackle number 10 as shown in illustration D029DG below?

INLAND ONLY You are underway in a narrow channel, and are being overtaken by another power-driven vessel. The overtakin...

Shipping articles are a contract of agreement between the members of the crew and who else?

Normally, your vessel is on a voyage of three months duration. How many sanitary inspections are required to be conduct...

Which type of cloud is the classic "thunderhead"?

Which device is required to be installed under the carburetor of a gasoline engine?

INTERNATIONAL ONLY A vessel sounds two short blasts. What does this indicate?

The master or individual in charge of a vessel prepares a certificate of discharge for each mariner being discharged fr...

The vertical motion of a floating vessel in which the entire hull is lifted by the force of the sea is known by which t...

Fog generally clears when the __________.

Which is a requirement for electrical wiring on all "T-Boats"?

INTERNATIONAL ONLY Two power-driven vessels are meeting. What would a two-blast whistle signal by either vessel mean?

Who carries the total responsibility for shipping and discharging the seamen on a vessel?

When making VHF radio calls to nearby stations, what level of transmitting power should you use?

Brief, violent showers frequently accompanied by thunder and lightning are usually associated with __________.

Which statement about the deck line is TRUE?

BOTH INTERNATIONAL & INLAND Which is the duration of each prolonged blast on whistle signals used by a power-driven ves...

The forecastle card is a copy of which document?

What is the lifesaving signal for "You are seen - Assistance will be given as soon as possible"?

On a working copy of a weather map, a cold front is represented by what color line?

Which statement is TRUE concerning penetrations and openings in watertight bulkheads in a small passenger vessel less t...

BOTH INTERNATIONAL & INLAND What is the duration of each blast of the whistle signals used in head-on and/or crossing s...

Unless otherwise stated, the term "approved" when applied to a small passenger vessel's equipment, means approved by wh...

Which statement is TRUE concerning life preservers (Type I personal flotation devices)?

When observing a rapid rise in barometric pressure, what may you expect?

According to 46 CFR Subchapter T the definition of a ferry includes which vessels?

BOTH INTERNATIONAL & INLAND Which of the signals, other than a distress signal, can be used by a vessel to attract atte...

According to Small Passenger Vessels Regulations, a vessel of less than 100 gross registered tons must be inspected by ...

What statement about immersion suits is TRUE?

Which is TRUE as the temperature of an air mass decreases?

On a small passenger vessel, 58 feet in length, carrying 52 passengers the fire pump shall have a minimum pumping capac...

BOTH INTERNATIONAL & INLAND What is the minimum sound signaling equipment required aboard a vessel 10 meters in length?

Which statement is TRUE with reference to small passenger vessels cooking and heating equipment?

Which is TRUE concerning fixed ballast, on small passenger vessels?

Which term is used to describe the small differences between the heights of two successive high tides or two low tides,...

Your vessel is off a lee shore in heavy weather and laboring. Which action should you take?

BOTH INTERNATIONAL & INLAND Which statement is TRUE regarding equipment for sound signals?

Which fuel cannot be used for cooking on vessels carrying passengers for hire? (small passenger vessel regulations)

Which statement is TRUE concerning small passenger vessels bunks installed in overnight passenger accommodation spaces?

Which is TRUE of the velocity of the current in large coastal harbors?

Which is TRUE of the spray of water in low-velocity fog?

BOTH INTERNATIONAL & INLAND Two power-driven vessels are crossing as shown in illustration D042RR below. Vessel "A" sou...

Each vessel shall be dry-docked or hauled out at intervals not to exceed 2 years if operated in salt water for a total ...

When must a small passenger vessel of not more than 65 feet in length have a collision bulkhead?

A line of position is __________.

You are the credentialed Master of a 100 GT towing vessel sailing coastwise. What percentage of the deck crew must be a...

BOTH INTERNATIONAL & INLAND A vessel nearing a bend where other vessels may be obscured is required to sound which sign...

How do you know how many passengers you may carry? (small passenger vessel regulations)

What is correct with respect to required watertight bulkheads on small passenger vessels less than 100 GT?

When you are steering on a pair of range lights and find the upper light is in line above the lower light, you should t...

What does the term "beam of a vessel" refer to?

BOTH INTERNATIONAL & INLAND Which vessel(s) is/are required to sound a fog signal of one prolonged followed by two short...

Before issuing an initial Certificate of Inspection, who must consider the construction arrangement and equipment of a ...

What is the minimum length of a life floats paddle on a small passenger vessel?

The direction in which a vessel is steered is the course. The path actually followed is the __________.

On vessels subject to the provisions of 46 CFR Subchapter T, which statement is TRUE concerning life jackets?

BOTH INTERNATIONAL & INLAND What is the required fog signal for a manned vessel being towed at night?

When an autopilot is being used aboard small passenger vessels, who must make or supervise the changeover from automatic...

On vessels subject to the provisions of 46 CFR Subchapter T, which statement is TRUE concerning life jackets?

The direction in which a vessel should be steered between two points is known by which term?

Which equipment is not required for a life float? (small passenger vessel regulations)

BOTH INTERNATIONAL & INLAND A vessel engaged in fishing while at anchor shall sound which fog signal?

On Subchapter T small passenger vessels, after loading and prior to departure, the master shall determine the vessel com...

On vessels that are required to have fixed carbon dioxide fire extinguishing systems, the controls to operate the system...

You are heading in a northerly direction when you come across an easterly current. Your vessel will respond in which ma...

On Subchapter T small passenger vessels, after loading and prior to departure, the master shall determine the vessel co...

BOTH INTERNATIONAL & INLAND You hear the firing of a gun at one-minute intervals from another vessel. What does this sig...

How are All life jackets carried on board small passenger vessels required to be marked? (small passenger vessel regulat...

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

On 10 November 2023 at 2130, you are inbound at Charleston Harbor Entrance Buoy “10” (ACT6611). Your vessel will transi...

What is the name of tackle number 8 as shown in illustration D029DG?

BOTH INTERNATIONAL & INLAND What does the continuous sounding of a fog whistle by a vessel indicate?

When must the Master of a small passenger vessel fitted with loading doors ensure that the doors are closed, watertight ...

Individual wires, used in systems greater than 50 volts, shall meet which requirement?

On 14 October 2023, you will be docking at the Southern Branch Elizabeth River, VA at the first low tide. The berth is l...

Your vessel has an injured crew member onboard that will require evacuation. Which of the following publications should ...