OUPV · Master less than 100 GRT
Practice for the captain's license deck exams: Rules of the Road, Deck General, Deck Safety and Navigation General. Pick an answer and see why it is right, why each other choice is wrong, and the exact sentence from the Navigation Rules, the CFR or another U.S. government document it comes from.
Not affiliated with, endorsed by, or connected to the U.S. Coast Guard or the National Maritime Center.
Example question written for this page.
A 12-meter sailboat is underway at night under sail alone. Which lights must she show?
Correct
Why B is correct. Under sail alone she is a sailing vessel, so Rule 25(a) applies. A masthead light is for power-driven vessels, which includes a sailboat motoring with her engine.
Source quoted
“A sailing vessel underway shall exhibit: (i) sidelights; (ii) a stern light.”
Four modules
For the OUPV (“6-pack”) Near Coastal and Master less than 100 GRT Near Coastal written exams. Chart plotting is not included as an exam module, because it needs a paper chart.
Steering and sailing rules, lights and shapes, sound signals and distress signals.
Mock exam Timed, in the module format
Seamanship, line handling, anchoring, vessel handling and the regulations for small vessels.
Mock exam Timed, in the module format
Firefighting, lifesaving equipment, emergencies on board and pollution prevention.
Mock exam Timed, in the module format
Aids to navigation, charts and compass, tides and currents, weather and marine radio.
Mock exam Timed, in the module format
What's inside
After you answer, you see why the correct choice is right and why each of the other three choices is wrong, written for that question.
Each explanation quotes the exact sentence it relies on from a U.S. government document: the Navigation Rules, 33 and 46 CFR, the Coast Pilot, the Light List, NOAA or the Coast Guard Boat Crew Handbooks, with its rule, section or page.
Work through one module or one topic area at a time, so you can spend your study time where you are weakest.
A timed mock exam for each module. No feedback until you submit, then your results by topic, with every explanation.
Questions you miss come back on later days until you get them right. Bookmark any question to find it again.
Track your progress in each module. After full mock exams, a simple Ready or Not yet. It is based on your practice results in this app and does not predict your exam result.
Every quote is machine-matched against the document it cites, and every explanation is re-checked by a second, independent reviewer before it goes into the app.
The app's screens are available in these languages and follow your device language. Questions and quoted sources are in English.
Try a question
One question from each module, with the explanation the app shows. Choose an answer to see why, and the source it is quoted from.
From a sample exam published as public information. The current exam may differ.
A vessel signals you three flashes on its maneuvering light. What is the meaning of this signal?
Why C is correct. Under both International and Inland Rule 34(b), a maneuvering light flashed three times supplements three short blasts and means “I am operating astern propulsion.” It says the engines are going astern, not how fast.
Why A is wrong. Doubt is signaled by at least five short and rapid flashes or blasts.
Why B is wrong. The signal says astern propulsion is being used; it does not indicate full speed astern.
Why D is wrong. An overtaking intention is signaled by whistle (and in International waters by prolonged and short blasts), not by three flashes.
Source quoted
“three flashes to mean ‘I am operating astern propulsion’”
From a sample exam published as public information. The current exam may differ.
Which type of line floats?
Why D is correct. Polypropylene is lighter than water and floats, which is why it is used for heaving lines and towing ski lines.
Why A is wrong. Nylon is heavier than water and sinks.
Why B is wrong. Dacron (polyester) is heavier than water and sinks.
Why C is wrong. Natural fiber like manila absorbs water and sinks, especially when old and waterlogged.
Source quoted
“A synthetic fiber with about half the strength of nylon, 25% lighter than nylon making it easier to handle, and it floats in water.”
From a sample exam published as public information. The current exam may differ.
What is required in addition to the heat, fuel, and oxygen of the fire triangle to have a fire?
Why B is correct. Fire needs four things, shown as the fire tetrahedron: heat, fuel, oxygen and an uninhibited chemical chain reaction. Break the chain reaction (as dry chemical does) and the fire goes out even if the other three remain.
Why A is wrong. Smoke is a product of burning, not something a fire needs.
Why C is wrong. Electricity can be an ignition (heat) source but is not a required element of fire.
Why D is wrong. Pressure is not one of the elements of the fire tetrahedron.
Source quoted
“The base of this figure represents a chemical reaction. The 3 standing sides of the figure represent heat, oxygen, and fuel.”
Privacy
Questions, explanations and quotes are built into the app, so you can study offline. There is no account. Your answers, notes and results are never sent to us.
No sign-up and no login. The app never asks for your name or email address.
The app does not use the advertising ID. It shows cards for our own other apps, which open the store page if you tap one.
Anonymous statistics about which screens and features are used (Google Analytics for Firebase). Your answers and notes are never sent. In the European Economic Area and Switzerland the app asks first, and you can turn them off in Settings.
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FAQ
No. Not affiliated with, endorsed by, or connected to the U.S. Coast Guard or the National Maritime Center. Answers and explanations are written by us from U.S. government documents.
From material the U.S. Coast Guard published as public information: the National Maritime Center's sample exams and the 2015 public question bank. The current exam may differ. No recalled or shared exam content is included.
Each quote is machine-matched against the government document it cites, and every explanation is re-checked by a second, independent reviewer before the question goes into the app. If you still find a mistake, report it from the question screen.
The written deck exams for OUPV (“6-pack”) Near Coastal and Master less than 100 GRT Near Coastal: Rules of the Road (Inland and International), Deck General, Deck Safety and Navigation General.
Not as an exam module. Chart plotting needs a paper chart, so practice it with a real chart and plotting tools.
Yes. Questions, explanations and quotes are built into the app. There is no account and no sign-in.
Your progress is stored only on your device. It is not backed up or moved to a new phone. A plan you bought moves with your Apple Account or Google account.
iPhone and iPad, and Android phones and tablets.
See the help page, or write to dys0707y@gmail.com.
Coming soon
Captain's License Prep: 6-Pack is being prepared for iPhone, iPad and Android. Questions or feedback? Write to dys0707y@gmail.com.
Not affiliated with, endorsed by, or connected to the U.S. Coast Guard or the National Maritime Center.