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

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


Prepare for or supplement your studies for your USCG license exam here.

Click here to create an account and enter SeaSources new online study.


Hi! We have a new website! It's phone / tablet friendly and speedier. Please visit it today! 

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   

QMED Oiler          

Deck Examination Questions

Master 25/50/100 Ton

Operator Uninspected Passenger Vessel

All Deck Questions

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

Latest NMC / USCG 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



Electricity, Electronics & Control Engineering

 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.

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

All Engine Room Examination Questions As of March 24, 2014 Regulations

  • Electricity, Electronics & Control Engineering
    • Ancillary Equipment & Systems
      • Maintenance
      • Systems': Operation And Function
      • Troubleshooting watchstanding
    • Batteries
      • Maintenance
      • Operation And Function
      • Troubleshooting Watchstanding
    • Distribution Systems
      • Component Devices And Circuits-operation & Function
      • Maintenance
      • Troubleshooting Watchstanding
    • Electric Generation
      • Alternators - Operation And Function
      • D.C. Generators - Operation And Function
      • Maintenance
      • Troubleshooting Watchstanding
    • Electric Propulsion
      • Maintenance
      • Operation And Function
      • Troubleshooting Watchstanding
    • Electronics
      • Components And Circuits: Operation And Function
      • Maintenance
      • Troubleshooting Watchstanding
    • Fire Fighting Practices
      • Fire Class, Structure And Regulations
    • General Electrical Maintenance
      • Insulation
      • Test Equipment
    • Motor Controllers
      • Controller Maintenance
      • New Questions
      • Troubleshooting Magnetic Controllers
      • Un Categorized
    • Motors
      • Un Categorized
      • A.C. Motors - Operation And Function
      • Maintenance
      • Troubleshooting Watchstanding
    • New Questions
      • Motor Controllers
      • Multimeter
      • Refrigeration Systems
      • Un Categorized ( About 1450 Questions)
    • Regulations (title 46 CFR- Subchapter . J & I)
      • Part 111: Electric Systems-general Requirements
      • Part 112: Emergency Lighting And Power Systems
    • Theory
      • Definitions And Principles
      • Diagrams
      • Math
    • Watch Duties
      • Watch Problem Prioritization


  If you are studying for a United States Coast Guard Engine Room License exam which includes this module, you should  work through these questions until you are scoring 80% or better on them.

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Revised: 12 May 2020 18:24:47 -0400 

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Email: Captain Steve 


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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 once again available to the public in PDF format from the NMC link above. The illustrations are not yet available for some of these questions.

Vessel Nomenclature  

View Screenshots of "TesTTaker" Software  

View Screenshots/Tutorial of Online Study

View comments from SeaSources Members 

See also:

SeaSources online Celestial Navigation Course 

MARYLAND NAUTICAL  Great source for practice charts and study guides


National Oceanic & Atmospheric Administration (NOAA)

The Navigation Center

Chart No. 1 Nautical Chart Symbols Abbreviations and Terms

Bluewater Books and Charts 

Search CFR'S Online

Open Book Renewals

Required Subjects for all Deck Licenses

Required Subjects for all Engineering Licenses

Required Subjects for Mobile Offshore Drilling Units, MODU.

Sea Service Requirements for Coast Guard Licenses