Wheelhouse Prep USCG Mariner Exam Prep

OUPV / Six-pack (Near Coastal), Revision & Practice Exams

Operator of Uninspected Passenger Vessels, the classic charter-captain licence. Built from official USCG NMC sample examinations (public domain).
Content last updated 12 June 2026

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The real exam is passed module by module: Rules of the Road requires 90%, most other modules 70%. Chart-plotting modules are taken on paper and not included.

Modules & your progress

Unlock the full question bank

The free sample is 79 questions, spread across every module in the same proportions as the real exam. The full bank contains every question from the NMC's current published sample examinations for this credential, with written explanations on the popular small-vessel credentials, one-off $29, lifetime access on up to 3 devices, all credentials included.

Score history

The real exam: key facts

Delivered byUS Coast Guard National Maritime Center; exams are sat at Coast Guard Regional Exam Centers (RECs)
Official examMerchant Mariner Credential (MMC) endorsement examinations
QuestionsSet per credential in your Approval to Test letter; the NMC does not publish module question counts
TimeEach module is sat in a 3½-hour examination period; modules are taken in consecutive periods
Passing scoreRules of the Road 90%; Deck General and Deck Safety 70% (NMC notice, January 2018)
Exam feeSet by 46 CFR 10.219: for an original officer endorsement, evaluation $100, examination $95 (lower level) or $110 (upper level), issuance $45
Pre-licensing or eligibilityApply to the Coast Guard first; you need the NMC's Approval to Test letter before you can book. The application stays valid for 12 months
Book your examdco.uscg.mil/nmc/Examinations

Checked 11 October 2026 from the official sources below. Rules and fees change, so confirm with US Coast Guard National Maritime Center; exams are sat at Coast Guard Regional Exam Centers (RECs) before you book.

Official sources

Frequently asked questions

Is the OUPV the same as the six-pack or charter captain's license?

Yes. OUPV (Operator of Uninspected Passenger Vessels) is commonly called the six-pack or charter captain's license, because it allows carrying up to six paying passengers.

What score do I need to pass the OUPV / Six-pack (Near Coastal) exam?

You must pass each module separately. Rules of the Road requires 90%; most other modules require 70%. Chart-plotting modules are worked on paper.

What modules are on the OUPV / Six-pack (Near Coastal) exam?

The exam covers 3 modules: Rules of the Road, Deck General/Safety, Navigation General.

How many practice questions are available for OUPV / Six-pack (Near Coastal)?

This page includes free sample questions drawn from the official USCG sample examinations, with a full bank of around 290 questions across all modules available with lifetime access.

Are these real USCG exam questions?

Every question comes from the U.S. Coast Guard National Maritime Center's published sample examinations, which are U.S. government works in the public domain. Wheelhouse Prep is not affiliated with or endorsed by the U.S. Coast Guard.

Do I need to create an account?

No. The free practice tests work in your browser with no signup. Your score history is saved on your own device.

When were these OUPV / Six-pack (Near Coastal) questions last updated?

Last updated 12 June 2026. The bank is refreshed whenever the Coast Guard publishes revised sample examinations.

Sample OUPV / Six-pack (Near Coastal) practice questions

A selection of free questions from the official USCG sample examinations. Use the interactive modules above for timed, scored drills.

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

  1. flashing blue light ✓
  2. flashing amber light
  3. blue flag
  4. flashing red light

INTERNATIONAL ONLY You are operating a vessel in a narrow channel. Your vessel must stay within the channel to be navigated safely. Another vessel is crossing your course from starboard to port, and you are in doubt as to his intentions. According to Rule 9, which statement is TRUE?

  1. You must sound one prolonged and two short blasts
  2. You should sound one short blast to indicate that you are holding course and speed
  3. You may sound at least five short and rapid blasts on the whistle ✓
  4. You are required to back down

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

  1. required to give-way in a crossing situation
  2. required to maintain course and speed in a crossing situation but may take action to avoid collision ✓
  3. required to sound the first passing signal in a meeting situation
  4. free to maneuver in any crossing or meeting situation as it has the right of way
Show all 79 sample questions with answers

BOTH INTERNATIONAL & INLAND You hear the fog signal of another vessel forward of your beam. Risk of collision may exist. You are required to take which action?

  1. take all way off, if necessary ✓
  2. stop your engines
  3. begin a radar plot
  4. All of the above

BOTH INTERNATIONAL & INLAND You are underway in heavy fog. You hear the fog signal of a vessel which is somewhere ahead of your vessel. Which action(s) are you required to take?

  1. Slow to minimum to maintain course and navigate with caution ✓
  2. Slow to moderate speed and navigate with caution
  3. Stop engines and navigate with caution
  4. Maintain speed and sound five short and rapid blasts

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

  1. only if they have operational radar
  2. in sight of one another in fog
  3. navigating in or near an area of restricted visibility ✓
  4. only if they are showing special purpose lights

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

  1. The WIG's lights must comply as closely as possible, as determined by her government. ✓
  2. An all-round light should be substituted for the after-masthead light and the stern light.
  3. The WIG must carry only the lights that comply with the rules; the others may be omitted.
  4. The WIG must be altered to permit full compliance with the rules.

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

  1. "I am altering course to port" ✓
  2. "I desire to pass starboard to starboard"
  3. "I desire to pass port-to-port"
  4. "I intend to alter course to port"

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

  1. A vessel restricted in its ability to maneuver, at anchor
  2. A sailing vessel underway
  3. A vessel not under command
  4. All of the above ✓

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

  1. One prolonged followed by two short blasts
  2. Two prolonged blasts
  3. One prolonged followed by one short blast
  4. One prolonged followed by three short blasts ✓

When is a lookout permitted to leave his station?

  1. Only when properly relieved ✓
  2. At the end of the watch
  3. 15 minutes before the end of the watch
  4. At any time

Which factor is most likely to impair the strength and durability of synthetic line?

  1. Sunlight ✓
  2. Dry rot
  3. Mildew
  4. Washing with mild soap

If heavy smoke is coming from the paint locker, what should be the FIRST firefighting response?

  1. Release the CO2 flooding system
  2. Enter and use a portable extinguisher
  3. Open the door to evaluate the extent of the fire
  4. Secure the ventilation ✓

Your vessel is on a course of 221°T at 15 knots. At 0319 a light bears 198.5°T, and at 0353 the light bears 176°T. At what time and distance off will your vessel be when abeam of the light?

  1. 0410, 5.2 miles
  2. 0417, 6.0 miles ✓
  3. 0427, 7.4 miles
  4. 0407, 4.3 miles

What will a veering wind do?

  1. Vary in strength constantly and unpredictably
  2. Change direction in a clockwise manner in the Northern Hemisphere ✓
  3. Circulate about a low-pressure center in a counterclockwise manner in the Northern Hemisphere
  4. Circulate about a high-pressure center in a clockwise manner in the Southern Hemisphere

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

  1. When they are crossing your course, both in the same direction
  2. When they are both parallel to the pier from ahead ✓
  3. When they are crossing your course, in opposite directions to the other
  4. When they are both setting you on the pier

In a following sea, a wave has overtaken your vessel and thrown the stern to starboard. To continue along your original course, which action should you take?

  1. Increase speed
  2. Use more left rudder
  3. Use more right rudder ✓
  4. Decrease speed

Which action should be taken prior to assuming the Deck Watch while the vessel is in port?

  1. Make a security call on VHF channel 16
  2. Ensure that the vessel's moorings are adequate ✓
  3. Ensure that all crew members are onboard
  4. Visually inspect and test operation of the blue mooring light

Which is an advantage of an ABC dry chemical over a carbon dioxide extinguisher?

  1. Lack of toxicity
  2. Greater multipurpose extinguishing ability ✓
  3. Less damage to electrical components
  4. Burn-back protection

Aneroid barometers are usually calibrated to indicate atmospheric pressure in which units?

  1. Inches of mercury and centimeters
  2. Inches of mercury and millibars ✓
  3. Inches of mercury and millimeters
  4. Feet of mercury and millibars

In North America, which direction do the majority of the weather systems move?

  1. From west to east ✓
  2. From south to north
  3. From east to west
  4. From north to south

An important step in fighting any electrical fire is to take which action?

  1. De-energize the circuit ✓
  2. Apply water to extinguish the fire
  3. Stop the vessel
  4. Stop ventilation

It is unlawful to approach within how many yards of a Northern Right Whale?

  1. 200
  2. 300
  3. 400
  4. 500 ✓

You are underway on course 215°T at 12 knots. The current is 000°T at 2.3 knots. What is the course made good?

  1. 209°T
  2. 217°T
  3. 222°T ✓
  4. 232°T

You are proceeding in a channel, your vessel is requiring a significant amount of right rudder and your bow is still falling off to port. What can you conclude from this information?

  1. Your vessel's turn rate indicator requires calibration
  2. Your vessel is in the deepest section of the channel
  3. Your vessel is at the outer limits of the channel ✓
  4. Your vessel has lost a blade on the screw

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

  1. Yawed
  2. Trimmed
  3. Pitchpoled
  4. Broached ✓

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

  1. With the wind off the starboard beam
  2. With the wind off the port beam
  3. With the wind from ahead
  4. With the wind from abaft the beam ✓

The Federal Water Pollution Control Act requires the person in charge of a vessel to immediately notify the Coast Guard as soon as he knows of any oil discharge. Failure to notify the Coast Guard can lead to a monetary fine and imprisonment up to what duration?

  1. 5 years ✓
  2. 3 years
  3. 2 years
  4. 1 years

Which type of cloud is the classic "thunderhead"?

  1. Cirrus
  2. Altostratus
  3. Cumulonimbus ✓
  4. Stratus

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

  1. Clearing weather, possibly accompanied by high winds ✓
  2. Heavy rain or severe thundershowers
  3. Clear weather with no wind, but the possibility of rain or snow within 24 hours
  4. Deteriorating weather with rain or snow

Which term is used to describe the small differences between the heights of two successive high tides or two low tides, in a tidal day?

  1. Mixed tides
  2. Semidiurnal tides ✓
  3. Diurnal tides
  4. Solar tides

Which method of adjusting mooring lines is MOST useful for leaving a boat free to rise and fall with the tide?

  1. Crossing the spring lines ✓
  2. Slacking bow and stern lines
  3. Slacking all forward running lines while keeping all after running lines taut
  4. Doubling up on spring or breast lines

Which type of bottom is best suited for holding an anchor of a small boat?

  1. Mud and clay ✓
  2. Rocky
  3. Sandy
  4. Gravel

After casting off moorings at a mooring buoy in calm weather, which action should you take?

  1. Go half ahead on the engines and put the rudder hard right
  2. Go half ahead on the engines and pass upstream of the buoy
  3. Go full ahead on the engine(s)
  4. Back away a few lengths to clear the buoy and then go ahead on the engines ✓

When is the effect of wind on exposed areas of the vessel most noticeable?

  1. When turning
  2. When going full ahead
  3. When backing ✓
  4. When going slow ahead

Where would spontaneous combustion most likely to occur?

  1. In dirty swabs and cleaning gear
  2. In rags soaked in linseed oil ✓
  3. In partially loaded fuel tanks
  4. In overloaded electrical circuits

Which method requires prior approval to be used when cleaning up an oil spill?

  1. Sorbent booms
  2. Suction equipment
  3. Chemical agents ✓
  4. Skimmers

Which is TRUE concerning the stowage of life jackets?

  1. They must be stowed in readily accessible locations ✓
  2. They are required to be stowed in messrooms
  3. They are required to be stowed in a central location
  4. They are always locked in watertight containers

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

  1. The glare from background lighting
  2. The elevation of the light
  3. The existing visibility conditions ✓
  4. The observer's height of eye

The Light List indicates that a light has a nominal range of 10 miles and is 11 feet high. If the visibility is 15 miles and your height of eye is 20 feet, at what approximate distance will you sight the light?

  1. 9.0 miles ✓
  2. 10.0 miles
  3. 11.0 miles
  4. 12.0 miles

Your vessel is proceeding down a channel, and you see a pair of range lights that are in line dead ahead. The chart indicates that the direction of this pair of lights is 229°T, and variation is 6°W. If the heading of your vessel at the time of the sighting is 232° per standard magnetic compass, what is the deviation?

  1. 3°E ✓
  2. 9°E
  3. 3°W
  4. 9°W

What do the numbers on isobars indicate?

  1. Wind speed
  2. Temperature
  3. Rain in inches
  4. Barometric pressure ✓

What is the FIRST sign of the existence of a well-developed tropical cyclone?

  1. Gale force winds from the north
  2. An unusually long ocean swell ✓
  3. Steep, short-period waves and light wind
  4. Thunderstorms and higher than usual humidity

Weather warnings such as gale, storm and hurricane warnings are based on which criteria?

  1. The amount of cloud cover forecasted
  2. The wind speed forecasted ✓
  3. The wave heights forecasted
  4. The amount of rain forecasted

How many high waters usually occur each day on the East Coast of the United States?

  1. One
  2. Two ✓
  3. Three
  4. Four

On 9 November 2023 at 1630, you are inbound at Charleston Harbor Entrance Buoy “10” (ACT6611). What is the direction and velocity of the current you are encountering as you pass Buoy “10”? Illustration D058NG D058NG.jpg

  1. 0.2kts at 335°T
  2. 0.1kts at 104°T ✓
  3. 0.1kts at 280°T
  4. 0.2kts at 172°T

On 14 October 2023, you will be docking at the Southern Branch Elizabeth River, VA at the second low tide. The berth is located between NOAA reference tidal station #8638660 and subordinate station #8639348. What time (LST) will you be docking? Illustration D063NG

  1. 1559
  2. 1459 ✓
  3. 1458
  4. 1500

Which term refers to the direction a current is flowing?

  1. Stand
  2. Vector direction
  3. Drift
  4. Set ✓

Which statement is TRUE concerning carbon dioxide?

  1. It is used on class B and C fires.
  2. It is heavier than air.
  3. It is non-conductive.
  4. All of the above are true. ✓

BOTH INTERNATIONAL & INLAND When is your vessel traveling at a "safe speed" as defined in the COLREGS?

  1. when you are traveling slower than surrounding vessels
  2. when no wake comes from your vessel
  3. when you can take proper and effective action to avoid collision ✓
  4. when you can stop within your visibility range

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

  1. an alternately flashing red and yellow light ✓
  2. a high intensity flashing white light (strobe)
  3. two amber lights in a horizontal line
  4. a fixed green light over a red flashing light

BOTH INTERNATIONAL & INLAND You are approaching another vessel on crossing courses. She is about one mile distant and is on your starboard bow. You believe she will cross ahead of you but she sounds a whistle signal of five short blasts. Which action should you take?

  1. initiate a passing signal that will allow for a half mile clearance
  2. make a large course change, and slow down if necessary ✓
  3. reduce speed slightly
  4. answer the signal and hold course and speed

BOTH INTERNATIONAL & INLAND The masthead light may be displaced from the centerline on which of the following vessels?

  1. a vessel engaged in trolling
  2. a power-driven vessel 12 meters in length
  3. a vessel of special construction ✓
  4. an air-cushion vessel in non-displacement mode

BOTH INTERNATIONAL & INLAND A vessel hearing a fog signal forward of her beam has not determined if risk of collision exists. What shall she reduce speed to?

  1. moderate speed
  2. half speed
  3. safe speed
  4. bare steerageway ✓

BOTH INTERNATIONAL & INLAND What would be a "special circumstance" under the Rules?

  1. Speed in fog
  2. More than two vessels crossing ✓
  3. Two vessels meeting
  4. Vessel at anchor

BOTH INTERNATIONAL & INLAND You are under sail making 5 knots. The apparent wind is broad on the port beam at 10 knots. You see another sailing vessel dead ahead on a meeting course. What action is correct?

  1. You are only required to maneuver if collision cannot be avoided by maneuver of the other vessel.
  2. Both vessels must maneuver to avoid collision.
  3. Only the other vessel must maneuver to avoid collision.
  4. You must keep out of the way of the other vessel. ✓

INLAND ONLY A flashing blue light is used to identify which of the following vessels?

  1. dredge pipelines on trestles
  2. air-cushion vessels in the non-displacement mode
  3. U.S. submarines
  4. law enforcement vessels ✓

INLAND ONLY Two power-driven vessels are meeting in the situation as shown in illustration D037RR below and will pass within 1/2 mile of each other. What does two short blasts from either vessel mean?

  1. "I am altering my course to port."
  2. "I intend to leave you on my starboard side." ✓
  3. "I intend to leave you on my port side."
  4. "I am altering my course to starboard."

INLAND ONLY Under the Inland Navigation Rules, what is the meaning of a one short blast signal used when meeting another vessel?

  1. "I am turning to starboard."
  2. "I am turning to port."
  3. "I intend to leave you on my starboard side."
  4. "I intend to leave you on my port side." ✓

INLAND ONLY The stand-on vessel in a crossing situation sounds one short blast of the whistle. This means that the vessel __________.

  1. is changing course to port
  2. is changing course to starboard
  3. intends to hold course and speed
  4. intends to leave the other on her port side ✓

BOTH INTERNATIONAL & INLAND While underway in fog, you hear a vessel ahead sound two prolonged blasts on the whistle. Which action should you take?

  1. sound whistle signals only if you change course
  2. sound two blasts and change course to the left
  3. sound only fog signals until the other vessel is sighted ✓
  4. not sound any whistle signals until the other vessel is sighted

BOTH INTERNATIONAL & INLAND Navigation lights must be displayed in all weathers from sunset to sunrise. They also __________.

  1. may be extinguished at night on open waters when no other vessels are in the area
  2. may be displayed during daylight ✓
  3. must be displayed when day signals are being used
  4. must be displayed when moored to a pier

BOTH INTERNATIONAL & INLAND Which is a distress signal?

  1. Answering a one blast whistle signal with two blasts
  2. Sounding 5 short blasts on the whistle
  3. Firing of green star shells
  4. A flaming barrel of oil on deck ✓

BOTH INTERNATIONAL & INLAND You see ONLY the light shown in illustration D080RR below. This could be what type of vessel?

  1. towing
  2. not under command
  3. engaged in fishing
  4. under oars ✓

BOTH INTERNATIONAL & INLAND On open waters, a power-driven vessel shall keep out of the way of which of the following?

  1. a vessel that is overtaking her
  2. a sailing vessel ✓
  3. a seaplane on the water
  4. a vessel on her port side that is crossing her course

BOTH INTERNATIONAL & INLAND Your vessel is at anchor in fog. The fog signal of another vessel, apparently underway, has been growing louder and the danger of collision appears to exist. In addition to your fog signal, what signal may be used to indicate your presence?

  1. One prolonged, one short, and one prolonged whistle blast
  2. One short, one prolonged, and one short whistle blast ✓
  3. One prolonged followed by two short whistle blasts
  4. No signal other than your fog signal may be used.

Normally, where is the potable water systems directly connected to?

  1. The feed-water system
  2. The potable water tank ✓
  3. The vessel's fire-main system
  4. A freshwater sanitary system

Your vessel is on a course of 343°T at 14 knots. At 2156 a light bears 320.5°T, and at 2217 the light bears 298°T. At what time and distance off will your vessel be when abeam of the light?

  1. 2235, 4.3 miles
  2. 2232, 3.4 miles ✓
  3. 2241, 6.9 miles
  4. 2228, 4.9 miles

On 10 November 2023 at 0130, you are inbound at Charleston Harbor Entrance Buoy “10” (ACT6611). What is the direction and velocity of the current you are encountering as you pass Buoy “10”? Illustration D058NG

  1. 0.8kts at 172°T
  2. 0.3kts at 104°T
  3. 0.3kts at 280°T ✓
  4. 0.8kts at 335°T

Which statement is TRUE when anchoring in calm water?

  1. Wait until the vessel is dead in the water before letting go the anchor
  2. Maintain headway on the vessel when letting go the anchor
  3. Let the anchor go with good headway on then go full astern until the vessel is stopped
  4. Maintain slight sternway on the vessel while letting go the anchor ✓

A daymark used to indicate the safe water in a channel will have which of the shapes shown in illustration D045NG below?

  1. A
  2. B
  3. C ✓
  4. D

One shot of anchor chain is equal to how many feet (meters)?

  1. 6 (1.8 meters)
  2. 15 (4.6 meters)
  3. 45 (13.7 meters)
  4. 90 (27.4 meters) ✓

Which is the root cause of wake damage to a vessel or structure in a narrow channel?

  1. Slack mooring lines
  2. Trim of the vessel
  3. Excessive speed ✓
  4. Improper steering of the vessel

What is the normal percentage of oxygen in air?

  1. 16%
  2. 18%
  3. 21% ✓
  4. 25%

A magnesium fire is classified as class _________.

  1. Class A
  2. Class B
  3. Class C
  4. Class D ✓

A mariner whose credential has been revoked shall not be issued another credential without which of the following?

  1. Approval of the Commandant ✓
  2. Approval of the Officer-in-Charge, Marine Inspection
  3. Approval of an administrative law judge
  4. Taking a new examination

Which type of cloud formation should be of immediate concern to small craft operators?

  1. Cirrus
  2. Nimbostratus
  3. Cumulonimbus ✓
  4. Altostratus

In a weather report, which defines the term "visibility"?

  1. The distance in miles at which prominent objects are identifiable by the unaided eye ✓
  2. The distance an observer can see with the unaided eye
  3. The distance an observer can see a prominent object with a telescope or binoculars
  4. The ability to identify an object at night utilizing binoculars

When daylight savings time is kept, the times of tide and current calculations must be adjusted. How can this be accomplished?

  1. Add one hour to the times listed for the reference stations ✓
  2. Subtract one hour from the times listed for the subordinate stations
  3. Apply no correction as the times at the reference stations are adjusted for daylight savings time
  4. Add 15° to the standard meridian when calculating the time differences