OUPV / Six Pack, Master 25/50/100 Ton, Upgrade to 25/50/100 Ton, Auxiliary Sail / Assistant Towing Endorsements & Deck Renewal - Online Training, Study Guides and Materials
Mariners Learning System (MLS) provides United States Coast Guard Approved Captain's License Programs to help you earn your captain's license at home or on the go with flexible and convenient training with over a 98% pass rate.
The OUPV / USCG Six-Pack Captain’s License is required for those wishing to offer fishing and sailing charters, drive a dive boat, or run sightseeing tours, etc. This license is commonly referred to as a Six-Pack since it allows the holder to take up to six paying passengers and crew on vessels up to 100 gross tons (about 75-90 feet long).
The 25/50/100 Ton Master Captain's License is given in increments up to 100 tons depending on your boating experience, and can be issued as a 25, 50, or 100 ton license. The USCG does not require that you get a Six-Pack License before you get your Masters, so if you qualify, you can skip the Six-Pack and go straight to your Masters.
Upon successful completion of the MLS course, the student studies the materials and takes a proctored exam at one of MLS Coast Guard approved testing sites. Once the student passes MLS multiple choice exam, he or she will receive a Mariners Learning System certificate recognized by the United States Coast Guard.
The certificate holder can submit the original certificate within one year, along with your application package and applicable fees to the USCG Regional Exam Center. Upon their approval of your package, they will send you your original License.
MLS Online Training
OUPV/Six-pack Captain’s License
- Training: By providing a methodical, well-organized program of professionally produced - on-demand lectures online, videos, and companion materials, the students are able to absorb and retain what they have learned.
- Subjects: Navigational Rules of the Road , Aids to Navigation & Chart Plotting, Electronic Navigation, Characteristics of Weather Systems, and Lifesaving Equipment & Safety.
- License Requirements: Be at least 19 years old (US citizenship is required); have a minimum of 360 underway boating experience since the age of 16 - ninety of those days being done in the last three years; pass a physical (including eye and hearing) and drug test within 1 year; pass a DOT drug test within 6 months; hold a valid CPR / First Aid card completed within 1 year of your license application; obtain a TWIC card (Transportation Workers Identification Credential); and successful completion of the MLS Course.
- Learn more (Six Pack Online Course)
25/50 or 100 Ton Master Captain’s License
- Training: MLS has developed an intuitive learning approach that's direct, clear, and effective. Methodical, well-organized program of professionally produced, on-demand lectures, videos, and companion materials.
- Subjects: Navigational Rules of the Road, Aids to Navigation, Electronic Navigation, Characteristics of Weather Systems, Lifesaving Equipment & Safety, Basic Seamanship Skills, Tides and Currents, Marine Radio Operation, Pollution Prevention, Vessel Handling Skills, and Emergency Procedures.
- Requirements: 19 years old with US citizenship; Minimum of 360 underway boating experience since the age of 15 - ninety of those days being done in the last three years; Pass a physical, drug test and eye exam; Hold a valid CPR/First Aid card issued within 6 months of your license application; Obtain a TWIC card; and successful completion of the MLS course.
- Learn more (Master Online Course)
OUPV Upgrade to 25/50 or 100 Ton Master Captain’s License
- The OUPV Upgrade to Master Captain's License course provides an opportunity for the holder of an OUPV/Six-Pack Captain's License to raise their grade to a Master-level license.
- Learn more (Master Upgrade Online Course)
Auxiliary Sailing Endorsement
- The Aux Sail Endorsement is required if you want to operate an Inspected Sailing Vessel. This endorsement allows the licensed Master to carry 7 or more passengers while under sail on an inspected vessel.
- To add this Endorsement onto a Master Inland or Mate Near Coastal license you must document at least 180 days on a sail or auxiliary sailing vessel.
- A Sailing Endorsement may be added onto a Master Near Coastal license by documenting at least 360 days on a sail or auxiliary sailing vessel.
- Learn more (Sailing Endorsement Online Course)
Assistance Towing Endorsement
- The Towing Endorsement is required if you will be engaged in towing a disabled vessel for payment.
- Any USCG License of 200 gross tons or less, including an OUPV/Six-pack License, may be endorsed for Assistance Towing.
- This endorsement is not a Towing license for the operation of a tugboat.
- Learn more (Towing Endorsement Online Course)
Deck License Renewal
- This course is for the licensed mariner who does not have the required 360 days of sea service in the last 5 years to renew their license.
- The course covers Deck License Renewal for the OUPV and Master of not more than 100-Ton for operation in the Great Lakes, Inland and Near Coastal areas.
- Learn more (Renewal Online Course)
Captain’s License Study Guides
- OUPV/Six-Pack Study Guide (4 Book Set)
- 25/50/100 Ton Master Study Guide (4 Book Set)
- Assistance Towing for the Mariner Study Guide
- Auxiliary Sail for the Mariner Study Guide
- Maritime Law - Uninspected Passenger Vessels Study Guide
- Maritime Law - Inspected Passenger Vessels Study Guide
- Navigation for the Mariner Study Guide
- Navigational Rules of the Road Study Guide
- Seamanship for the Mariner Study Guide
Go to Captain's License Study Guides
FCC License Study Guides
- MROP - Marine Radio Operator Permit (MP) Practice Test Book
- GROL - General Radiotelephone Operator License (PG) Practice Test Book
- Restricted GMDSS - Radio Operators License (RG) Practice Test Book
- GMDSS - Radio Operators License (DO) Practice Test Book
- GMDSS - Radio Maintainers License (DM) Practice Test Book
- Ship Radar Endorsement Practice Test Book
Go to FCC License Study Guides
Other Bundles, Packs and Offers
- There are options to bundle courses for cost effective learning
- Bonus pack provides additional support and materials such as training charts, nautical parallel rulers, dividers, pencils, sharpeners etc
- One year's access to the award-winning interactive software online
- 24/7 access to online instructors
- Toll free telephone support with instructors
- 2 year free USCG application support online with courses
- Discount Codes: more details here
Discount Code: $200 off EDUMAR200CAPT for Captains Course
OR 15% off EDUMAR15SUN All Courses
Go to Captain's License Courses
Last Updated: May 17, 2026