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

Open Book License Renewals

We now have a whole new website.


Click here to redirect. 

  SeaSources online study is the perfect solution for open book Coast Guard license renewals. Once you have established an account in the online study and purchased a basic $40 subscription through the online study you will have access to our search function which will enable you to look up any and all questions that the NMC sent you for your open book renewal exam. The easiest way to deal with this is to open the PDF that was sent to you and copy/paste the question into the search window in the online study. The search should return the question with the correct answer.

  After you have received your questions in PDF format by email you may choose to get a little help looking up the questions. Forward them to me and I will go through them for you for a $100.00 donation.  Captain Steve 

Making a donation does not create a subscription

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Renewal Exams

  Renewal Exams are administered in accordance with 46 Code of Federal Regulations (CFR) 10.227 Requirements for Renewal:
(i) The applicant must either—

(A) Present evidence of at least one year of sea service during the past five years;

(B) Pass a comprehensive, open-book exercise covering the general subject matter contained in appropriate sections of subpart (I) of this part;

(C) Complete an approved refresher training course; or

(D) Present evidence of employment in a position closely related to the operation, construction, or repair of vessels (either deck or engineer as appropriate) for at least applicant for a deck license or officer endorsement with this type of employment must also demonstrate knowledge on an applicable Rules of the Road open-book exercise.

   Renewal Modules are take home exams issued to the mariner by the Regional Exam Centers (RECs). It is recommended that completed exams be returned to the REC for grading within 30 days in order to assure the exam cycle, including retakes, is completed within 90 days.

  In accordance with 46 CFR 10.227 (e): Applicants for renewal who do not meet the sea service or exam requirements may be issued a Document of Continuity. Documents of continuity do not expire and are issued solely to maintain an individual’s eligibility for renewal. A document of continuity does not entitle an individual to serve as a merchant mariner. A holder of a document of continuity may obtain a properly endorsed, valid merchant mariner credential (MMC) at any time by satisfying the requirements for renewal.

   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.

   The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of SeaSources.net.

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

Copyright 2000 by SeaSources.net. All rights reserved.
Revised: 26 Oct 2023 13:52:09 -0400 

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.

Home Page 


Boat Jobs Available

Download Illustrations

Practice Final Exams

Open Book Renewals

SeaSources Celestial Navigation Training Videos 

Exam Question Downloads  


Download TesTTaker Software  


Free Sample Downloads  


Member Comments  


Contact SeaSources   





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)

Chart No. 1 Nautical Chart Symbols Abbreviations and Terms

Bluewater Books and Charts 

Search CFR'S Online