, 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



Mobile Offshore Drilling Unit


Definition:  A generic term for several classes of self-contained floatable or floating drilling machines such as jackups, semisubmersibles, and submersibles. 

Subject requirements

Download Operating Manual for Coastal Driller     

Download Operating Manual for Deep Driller

 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:

  • MODU Specific Questions
    • Deck Safety & Environmental Protection
      • Modu Specific Questions
        • Administration
          • Records
        • Basic Hydraulics
          • Components - Operation and Functions
        • Communications
        • Damage Control
          • Methods and Organization
        • Drilling Operations
          • Machinery
          • Procedures
          • Tools
        • Emergency Equipment
          • Life Boats and Survival Craft
        • Emergency Procedures
          • Abandon Rig
          • Blow Out
          • Collision
          • Failure of Ballasting System
          • Fire and explosion
          • H2S
          • Heavy Weather
          • Man Overboard
          • Mooring Emergencies
          • Temporary Repairs
        • Fire Fighting
          • CO2
          • Dry Chemical
          • Halon
          • Water
        • Fire Prevention Principles
          • Prevention, Drills
        • Fire Theory
          • Elements of Fire
          • Principles and Definitions
        • Firefighting Prevention and Appliances
          • Fire Drills
          • Fire Main System
          • Fire Protection of Helicopter Deck
          • Firefighting Techniques
          • Fixed Co2 System
          • Fixed Water System
          • Foam Systems
          • Modu Firefighting Regulations
          • Portable and Semi portable Extinguishers
          • Portable Extinguishers
          • Portable Extinguishers _ Co2
        • General Engineering
          • Equipment
          • Failures
          • Operations
        • Hazardous Cargo
          • Package - Labels
        • International Maritime Law
          • Imo
          • Load Lines
          • Marpol
        • Lifesaving and Survival
          • Procedure and Rules
        • Maneuvering and Handling
          • Anchors and Anchor Handling
          • Anchors and Anchor Handling, Chain
          • Anchors and Anchor Handling, Anchor System
          • Emergency Procedures
          • Heavy Weather Operations
          • Mooring, Positioning
          • Moving, Positioning
        • Medical Care
          • Injuries
        • Meteorology and Oceanography
          • Synoptic Chart Forecasting
          • Weather Systems
        • Mooring Emergencies
        • National Maritime Law
          • 46 CFR
          • 46 CFR _ Construction and Arrangement
          • 46 CFR _ Cranes and Trucks
          • 46 CFR _ Equipment Markings
          • Certificates and Documents
          • Certificates and Documents _ Certificate of Inspection
          • Emergency Signals and Station Bill
          • Inspection Regulations
          • Licensing and Manning Requirements
          • Lifesaving Equipment
          • Miscellaneous Equipment
          • Operation of Safety Equipment
        • Personnel Management
          • Casualty Reports
          • Logs and Recordkeeping
          • OIM Responsibilities
        • Safety
          • Emergency Signals and Station Bill
        • Seamanship
          • Cargo Handling
          • Crane Procedures
          • Crane Procedures _ Booms
          • Helicopter Refueling
          • Personnel Transfer
          • Vessel Mooring
        • Ship Construction and Repair
          • Components, Construction, Terminology
          • Modu Construction
        • Ship's Business
          • Ships Documents
        • Stability Calculations
          • Movement of G
        • Stability, Ballasting, Damage Control
          • Completion of Variable Load Form
          • Damaged Trim and Stability Countermeasures
          • Definitions
          • Draft
          • Draft and Load Lines
          • Emergency Operations
          • Heel
          • Jack-up Operations Manual
          • Jack-up Operations Manual, Bilge Operation Instructions
          • Lift Boats
          • Load Line Requirements
          • Moments
          • Movement of G
          • On-station Operations
          • Semisubmersible Operations Manual
          • Semisubmersible Operations Manual _ Bilge Operation Instructions
          • Semisubmersible Operations Manual _ Ballasting Procedures
          • Ship Construction and Structural Members
          • Stability Calculations
          • Tanks and Piping
          • Theory
          • Trim
          • Trim and Stability
        • Stability, Trim and Flooding
          • General Stability
        • Watchkeeping
          • Colregs
          • Modu Obstruction Lights
          • Watchkeeping Principles
    • Engineering Safety and Environmental Protection
      • MODU Specific Questions
        • Damage Control
          • Methods and Organization
        • Emergency Equipment
          • Abandon Rig
          • Immersion Suits
          • Life Boats and Survival Craft
          • Lifesaving Equipment
          • Line Throwing Apparatus
          • Man Overboard
          • Pfd's
          • Respiratory Protection
          • Ring Buoys
        • Emergency Procedures
          • Abandon Rig
          • Fire _ Explosion
          • H2S
          • Heavy Weather
        • Fire Class, Structure and Regulations
        • Fire Fighting Practices
          • CO2
          • Dry Chemical
          • Foam
          • Fog Applicators
          • Halon
          • Water
        • Fire Prevention Principles
          • Prevention, Drills
          • Prevention, Drills and ER Fire Duty
        • Fire Theory
          • Conduction, Convention, and Radiation (modu)
          • Elements of Fire (modu)
          • Poisonous Gases
          • Principles and Definitions
        • Firefighting Prevention and Appliances
          • Fire Main System
        • Foam
          • Regulations
        • Hazardous Materials
          • Cargo Tank Precautions and Operations
          • Marpol
          • MODU Drill Mud
        • Pollution and Prevention
          • Emergency Stopping
          • Marpol
          • Prevention
          • Records
        • Principles and Definitions
          • Elements of Fire (modu)
          • Poisonous Gases
        • Safety
          • Accident Prevention
          • Emergency Signals and Station Bill
        • Stability, Ballasting, Damage Control
          • Damaged Trim and Stability Countermeasures
          • Definitions
          • Load Line Requirements
          • Tanks and Piping
          • Theory
        • Stability Trim and Flooding
          • Draft and Load Lines
          • Flooding and Countermeasures
          • General Stability



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 80% or better on them.




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Revised: 12 May 2020 19:46:23 -0400 

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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