Welcome to Seasources.net. Established in 1996, we are the ultimate source for online USCG exam preparation assistance. Seasources.net provides free online exam preparation along with downloadable studyguides and standalone software that allows you to continue your studies without an internet connection.

SeaSources.net, Training for Mariners. The First with Online Study for the Maritime Industry.

Click here to create an account in the online study and begin your license preparation.

The subjects listed below are currently available for testing in the new online study room and are available for download to your computer. Click on subject below for details.

Engineering Examination Questions

All Engine Room Questions

Engine Room Electrical         

Engine Room General          

Engine Room Safety            

Engine Room Steam            

Engine Room Motor   

Gas Turbine Plants 

QMED Oiler          

Deck Examination Questions

Master 25/50/100 Ton

Operator Uninspected Passenger Vessel

All Deck Exam Modules

Able Seaman Questions

Advanced Subjects, Unlimited Oceans Master, Mate

Rules of the Road  

Aids to Navigation  Glossary Included

Breathing Apparatus

Cargo Equipment 

Cargo Stowage

Charts and Publications 

Chemical Testing

Right Whales

Damage Control  

Deck Engineering

Deck Safety

Emergency Procedures 

FCC Exam Questions

Fire Fighting Glossary Included 

First Aid  


Great Lakes

Hazardous Cargo

Inert Gas

Inland Navigation  

Instruments and Accessories



Liquid Cargo and Bunkering

Marine Radio Operator 

Meteorology  "Glossary Included" 

Mobile Offshore Drilling Unit

Previews of Deck and Engine Room Questions

Celestial Navigation

Navigational Procedures

Pollution Control and Prevention

Rules and Regulations

Plotting/Navigational Problems


Survival Craft

Seamanship   Glossary Included

Sailing Vessels  

Ship Handling 

Ships Construction Glossary Included  

Ships Business


Stability and Trim Glossary Included 


Tides and Currents Glossary Included 



Common Knots

Radar Plotting

Chart Plotting / Navigation Problems

 Listed below is a table of contents of the questions on this subject as they appear in the new online study. Click on the "Enter Online Study" link above to begin preparing for your exam.

Click here to Preview Navigation Problems, Bearing & Distance Off Questions

Click here to Preview Navigation Problems, Compass Course Problem Questions

Click here to Preview Navigation Problems, Fuel Consumption Questions

Click here to Preview Navigation Problems, Ocean Track Plotting

Click here to Preview Navigation Problems, Speed By Rpm Questions

Click here to Preview Navigation Problems, Time Tick Questions

From the pull down menu in the online study select from the following topics:

  • All USCG Deck Question Databank
    • Navigation Problems
      • Electronic Navigation
        • Time Tick Problems
      • Miscellaneous Navigation Problems
        • Fuel Consumption
          • Direct Ratio - fuel displace.
          • Give Distance, Change Speed
          • No Distance, Change Speed
          • No Distance, Change Fuel
          • Change Distance
        • Speed By Rpm
          • Day's Run
          • Rpm
          • Slip
          • Speed SOA
      • Ocean Track Plotting
        • ETA
        • Great Circle Sailing
          • Initial Course and Distance
          • Longitude of The Vertex
          • Latitude of The Vertex
          • Determine The Parallel of Latitude
        • Mercator Sailing
          • Lat. Long. Course Speed
        • Mid-latitude Sailing
        • Parallel Sailing
          • Lat. Long. arrival - departure
        • Voyage Planning
          • Gnomonic Tracking Chart
      • Terrestrial Navigation
        • Compass Course Problems
          • Compass Error, Leeway
          • Course By Terrestrial Observation
          • Course In Current
          • Deviation Table Construction.
        • Terrestrial Observations
          • Bearing Problems
          • Distance Off
    Navigation Problems:
    • Chart Plotting
      • Practice Tests
        • 15 Question
          • 22 Practice Tests on Chesapeake Bay Entrance. Chart 12221TR

          • 14 Practice Tests on Long Island Sound - Eastern Part. Chart 12354TR

          • 18 Practice Tests on Block Island Sound. Chart 13205TR

        • 9 Question

          • 6 Practice Tests on Chesapeake Bay Entrance. Chart 12221TR

          • 14 Practice Tests on Long Island Sound - Eastern Part. Chart 12354TR

          • 4 Practice Tests on Block Island Sound. Chart 13205TR

        • Western Rivers

          • 52/10 Question Tests on Western Rivers Chart Problems

   If you are studying for a United States Coast Guard Deck License exam which includes this module, you should  work through these questions until you are scoring 90% or better on them.

Here is a great resource for NOAA Training Charts

Your Complete Navigation Resource Center

   Maryland Nautical Sales is one of the largest nautical chart agents in the United States. They have in stock a worldwide selection of Nautical Charts, NOAA Training Charts, Nautical Books, U.S.C.G. License Textbooks, Electronic Charts & Navigation Software.

   No pop ups,  Banners,  Spam,  Garbage, Advertisements, Hidden Gimmicks or any proverbial "Fine Print" to deal with. What you see is what you get. Just down-to-earth information and this site is dedicated to keeping it that way.

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SeaSources.net, Training for Mariners, is a registered Trademark

Copyright 2000 by SeaSources.net. All rights reserved.
Revised: 24 Aug 2023 19:59:14 -0500 

Contact Phone: 207-629-7004

Email: Captain Steve 

  For details on license requirements, application forms,  licensing fees, and testing locations, visit the United States Coast Guard / National Maritime Centers web site and look under Mariner's information center. The questions used in the online study  are updated annually from the NMC sample exams. All illustrations are current.

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See also:

SeaSources online Celestial Navigation Course 

MARYLAND NAUTICAL  Great source for practice charts and study guides


National Oceanic & Atmospheric Administration (NOAA)

Chart No. 1 Nautical Chart Symbols Abbreviations and Terms

Bluewater Books and Charts 

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