Revise with instant feedback: the moment you pick an answer you see whether it was right, with the explanation where available. Untimed — ideal before you sit a mock exam. Questions you miss keep coming back until you know them.
Exam-day conditions: no feedback until you submit, each module scored separately so you can see your weak areas, plus an overall score against the pass mark, with a full question-by-question review at the end.
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.
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.
| Delivered by | US Coast Guard National Maritime Center; exams are sat at Coast Guard Regional Exam Centers (RECs) |
|---|---|
| Official exam | Merchant Mariner Credential (MMC) endorsement examinations |
| Questions | Set per credential in your Approval to Test letter; the NMC does not publish module question counts |
| Time | Each module is sat in a 3½-hour examination period; modules are taken in consecutive periods |
| Passing score | Rules of the Road 90%; Deck General and Deck Safety 70% (NMC notice, January 2018) |
| Exam fee | Set 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 eligibility | Apply 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 exam | dco.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.
Wheelhouse is a $29 question bank built from the Coast Guard's own sample exams, not an approved course. Here is how it compares with the courses and tools mariners usually consider, including where they are the better choice. See the comparison with Mariners Learning System, Sea School, MPT and others.
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.
You must pass each module separately. Rules of the Road requires 90%; most other modules require 70%. Chart-plotting modules are worked on paper.
The exam covers 3 modules: Rules of the Road, Deck General/Safety, Navigation General.
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.
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.
No. The free practice tests work in your browser with no signup. Your score history is saved on your own device.
Last updated 12 June 2026. The bank is refreshed whenever the Coast Guard publishes revised sample examinations.
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?
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?
BOTH INTERNATIONAL & INLAND Which is TRUE of a power-driven stand-on vessel?
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?
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?
BOTH INTERNATIONAL & INLAND The steering and sailing rules for vessels in restricted visibility apply to vessels __________.
INTERNATIONAL ONLY A wing in ground (WIG) craft cannot comply with the spacing requirement for masthead lights. What is required in this situation?
INTERNATIONAL ONLY Two power-driven vessels are meeting. What would a two-blast whistle signal by either vessel mean?
BOTH INTERNATIONAL & INLAND Which vessel(s) is/are required to sound a fog signal of one prolonged followed by two short blasts?
BOTH INTERNATIONAL & INLAND What is the required fog signal for a manned vessel being towed at night?
When is a lookout permitted to leave his station?
Which factor is most likely to impair the strength and durability of synthetic line?
If heavy smoke is coming from the paint locker, what should be the FIRST firefighting response?
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?
What will a veering wind do?
You are docking a vessel. When are the wind and current most favorable in this situation?
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?
Which action should be taken prior to assuming the Deck Watch while the vessel is in port?
Which is an advantage of an ABC dry chemical over a carbon dioxide extinguisher?
Aneroid barometers are usually calibrated to indicate atmospheric pressure in which units?
In North America, which direction do the majority of the weather systems move?
An important step in fighting any electrical fire is to take which action?
It is unlawful to approach within how many yards of a Northern Right Whale?
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?
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?
Which term defines when a boat turns broadside to heavy seas and winds, thus exposing the boat to the danger of capsizing?
Most of your vessel's superstructure is forward. How will the vessel lie when drifting with no way on?
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?
Which type of cloud is the classic "thunderhead"?
When observing a rapid rise in barometric pressure, what may you expect?
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?
Which method of adjusting mooring lines is MOST useful for leaving a boat free to rise and fall with the tide?
Which type of bottom is best suited for holding an anchor of a small boat?
After casting off moorings at a mooring buoy in calm weather, which action should you take?
When is the effect of wind on exposed areas of the vessel most noticeable?
Where would spontaneous combustion most likely to occur?
Which method requires prior approval to be used when cleaning up an oil spill?
Which is TRUE concerning the stowage of life jackets?
The luminous range of a light takes into account which factor?
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?
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?
What do the numbers on isobars indicate?
What is the FIRST sign of the existence of a well-developed tropical cyclone?
Weather warnings such as gale, storm and hurricane warnings are based on which criteria?
How many high waters usually occur each day on the East Coast of the United States?
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
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
Which term refers to the direction a current is flowing?
Which statement is TRUE concerning carbon dioxide?
BOTH INTERNATIONAL & INLAND When is your vessel traveling at a "safe speed" as defined in the COLREGS?
INLAND ONLY A law enforcement vessel patrolling a marine regatta may exhibit a flashing blue light or which of the following alternates?
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?
BOTH INTERNATIONAL & INLAND The masthead light may be displaced from the centerline on which of the following vessels?
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?
BOTH INTERNATIONAL & INLAND What would be a "special circumstance" under the Rules?
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?
INLAND ONLY A flashing blue light is used to identify which of the following 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?
INLAND ONLY Under the Inland Navigation Rules, what is the meaning of a one short blast signal used when meeting another vessel?
INLAND ONLY The stand-on vessel in a crossing situation sounds one short blast of the whistle. This means that the vessel __________.
BOTH INTERNATIONAL & INLAND While underway in fog, you hear a vessel ahead sound two prolonged blasts on the whistle. Which action should you take?
BOTH INTERNATIONAL & INLAND Navigation lights must be displayed in all weathers from sunset to sunrise. They also __________.
BOTH INTERNATIONAL & INLAND Which is a distress signal?
BOTH INTERNATIONAL & INLAND You see ONLY the light shown in illustration D080RR below. This could be what type of vessel?
BOTH INTERNATIONAL & INLAND On open waters, a power-driven vessel shall keep out of the way of which of the following?
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?
Normally, where is the potable water systems directly connected to?
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?
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
Which statement is TRUE when anchoring in calm water?
A daymark used to indicate the safe water in a channel will have which of the shapes shown in illustration D045NG below?
One shot of anchor chain is equal to how many feet (meters)?
Which is the root cause of wake damage to a vessel or structure in a narrow channel?
What is the normal percentage of oxygen in air?
A magnesium fire is classified as class _________.
A mariner whose credential has been revoked shall not be issued another credential without which of the following?
Which type of cloud formation should be of immediate concern to small craft operators?
In a weather report, which defines the term "visibility"?
When daylight savings time is kept, the times of tide and current calculations must be adjusted. How can this be accomplished?