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by Samantha Inman October 14, 2026 5 min read
The Auxiliary Sailing Endorsement is a credential issued by the United States Coast Guard (USCG) that authorizes a licensed Master to operate inspected sailing vessels carrying seven or more paying passengers. It attaches to an existing 25/50/100-Ton Master captain’s license and requires documented sea service on sailing vessels plus a USCG-approved exam.
The Master’s allows operation of uninspected power and sail and inspected power vessels. To operate inspected sailing vessels, you need the Sail Endorsement.
Here’s what the endorsement covers, who needs it, and how to get it.
The Sailing Endorsement authorizes the holder to operate inspected sail or auxiliary sailing vessels within the scope and limitations of their existing Master license. Inspected sailing vessels carry a Certificate of Inspection (COI) aboard that specifies the maximum number of paying passengers and which Master’s license level is required for that vessel.
The Sailing Endorsement gives Master-licensed captains the authority to carry seven or more paying passengers on inspected sailing vessels. This opens up sailing charter operations, tall ship excursions, sailing school vessels, and other commercial sailing work that an OUPV or a standard Master license alone can’t cover.
The endorsement inherits the geographic scope of your existing license. If your Master captain’s license is for near coastal waters, the Sailing Endorsement applies to near coastal waters as well. See how USCG captain’s licenses are structured for more on route endorsements.

Yes, but only uninspected sailing vessels with up to six paying passengers. The OUPV already authorizes both power and sail on uninspected vessels. You don’t need a Sailing Endorsement on top of the OUPV. The endorsement only applies to the Master license level, where inspected sailing vessels come into play.
Not every captain who sails needs this endorsement. It depends on three factors: the type of license you hold, the type of vessel you operate, and how many paying passengers you carry.

If you hold a Master license and plan to operate inspected sailing vessels commercially, you need the Sailing Endorsement. This applies to sailing charter operators, tall ship crew, and anyone operating an inspected passenger vessel under sail.
Operating an inspected sailing vessel without the proper endorsement can result in penalties, including fines and possible suspension or revocation of your Merchant Mariner Credential (MMC). Your vessel insurance likely won’t cover you either.
The Sailing Endorsement requires documented time on sailing or auxiliary sailing vessels. The specific amount depends on the license level the endorsement attaches to.
|
License Level |
Sea Service on Sailing Vessels |
|
Master Inland or Mate Near Coastal |
180 days |
|
Master Near Coastal |
360 days |
The required sailing experience can be cumulative, not necessarily consecutive, as long as the total days meet the requirement for the endorsement you’re seeking. Document your sailing time on Coast Guard form CG-719S, the same form used for your captain’s license sea service.
These days are specific to sailing vessels. Time on power-only boats doesn’t count toward the Sailing Endorsement, even if it counted toward your Master license. If you’re still building sailing time, keep a detailed log of every day on the water under sail. See how much sea time you need for a captain’s license for guidance.
Yes. Sea service on recreational sailing vessels counts as long as it’s properly documented. The Coast Guard doesn’t require the vessel to be commercially operated for the service to count toward endorsement requirements.
The Auxiliary Sailing Endorsement and American Sailing Association (ASA) courses are two different credentials with different purposes. This distinction matters because some captains assume an ASA certification satisfies the USCG requirement.
|
Feature |
USCG Sailing Endorsement |
ASA Sailing Courses |
|
Issuing Authority |
United States Coast Guard |
American Sailing Association (private) |
|
Purpose |
Professional qualification for commercial sailing |
Recreational sailing education |
|
Credential Type |
Federal endorsement on your MMC |
Private certificate |
|
Requirement For |
Operating inspected sailing vessels commercially |
Not required by law |
|
Exam |
USCG-approved sailing module exam |
ASA course-specific assessment |
The Sailing Endorsement is a professional, federal qualification. ASA courses are recreational education. One doesn’t substitute for the other. If you’ve completed ASA courses, that experience helps, but you still need to pass the USCG-approved exam and document the required sea service to earn the endorsement.
MLS offers the Sailing Endorsement online course and exam for $150. The course covers sailing vessel seamanship, sailing rules of the road, anatomy of a sailboat, and sailing terms. Most students complete it in two to three hours. There’s no separate exam fee.
Yes. MLS offers a USCG-approved online course and exam for the Sailing Endorsement. You’ll have one year of access to the course material, and you can test from home. The course is designed as a four-hour program, though most students complete it faster.
Once you pass the MLS exam, you’ll receive a Certificate of Completion. Submit that certificate along with your documented sailing sea service, the appropriate application forms, and any required fees to the National Maritime Center (NMC) to have the endorsement added to your existing MMC.
The Sailing Endorsement is valid for the same duration as your primary license, which is typically five years. When you renew your captain’s license, the Sailing Endorsement renews with it.
Processing times at the NMC vary. Once your application packet is complete and submitted, expect a timeline similar to your original license application. Plan ahead if you have a sailing charter season to meet.
No. The Sailing Endorsement can only be added to a Master-level license. The OUPV/Six-Pack already covers uninspected sailing vessels, so no additional endorsement is needed at that level.
No. Your existing TWIC card (if applicable) covers all endorsements on your MMC. The Sailing Endorsement doesn’t require a separate security credential.
Yes. Both endorsements can be added to a Master license independently. MLS offers both the Sailing Endorsement and the Towing Endorsement as separate courses. See the different types of captain’s licenses for a full breakdown of endorsement options.
The Sailing Endorsement adds inspected sailing vessels to your Master license, removing the power-only limitation. If you’re qualified and the sailing industry interests you, adding this endorsement opens the door to commercial sailing work that a standard Master license can’t cover.
If you have questions about the Sailing Endorsement or any other part of the licensing process, the team at Mariners Learning System is here to help.
Regulations change. This article reflects USCG guidance as of the date above. For the most current requirements, contact the National Maritime Center or a Mariners Learning System licensing specialist. Reviewed for accuracy against current USCG guidance by the Mariners Learning System team.
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