A Merchant Mariner Credential (MMC) and a U.S. Coast Guard (USCG) License are the same thing! Technically the phrase USCG License is considered a legacy term, and we still use it within the maritime community.
So what is a Merchant Mariner Credential (MMC)?
An MMC is issued by the U.S. Coast Guard (USCG) in accordance with Federal regulations. Each MMC describes the type(s) of vessel(s), tonnage(s), horsepower(s), and waters (routes) for which the mariner is qualified. For service in international waters, the MMC would include appropriate endorsements according to the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW).
Do I need an USCG License or MMC to work on boats?
It depends, if you are working on a United States (U.S.) merchant vessel that is greater than 100 Gross Register Tons (GRT) you are required to have a valid U.S. MMC. This means everyone from the Steward to the Captain has to have a valid MMC on them at all times. The only exception to this 100 GRT rule is operators of uninspected passenger vessels. If you are working on vessels less than 100 GRT there are certain positions which are required to have a valid MMC which are clearly laid out in the vessels safe manning document. It's typical for only the Captain on a vessel less that 100 GRT to hold a USCG License while the crew does not hold a valid MMC.
We hope this made your life a little easier and if you have other questions the MM-SEAS team is always here to help!
MM-SEAS is free to use on your own and if you need some more personalized help you can upgrade to MM-SEAS Expert Access inside of the site.
No matter what, when you are ready to submit your application you can do it yourself, or you can hand the whole thing to us. A Stress-Free MMC is $399. Two MM-SEAS licensing experts check every page, we pay your Coast Guard fees at submission and charge your card so you never touch pay.gov, and we stay on it with the National Maritime Center until your credential is issued.
MM-SEAS Expert Access is $99 a year. It is your personal guidance counselor for USCG licensing: what training you need next, which sea time counts, and how to reach the credential you want, by phone, email, chat or a 1 on 1 video call. Expert Access members also get $50 off a Stress-Free MMC.
Need to renew, upgrade or get your first USCG license? We're here to help.
About the author
Nate has over 15 years of professional maritime experience and has hawsepiped his way to a 3rd Mate Unlimited Endorsement with full STCW compliance. He is proud veteran of the NOAA Commissioned Corps.
