OUPV allows up to 6 passengers on uninspected vessels. Master's has no limit and works on both vessel types. Choose based on your needs.
It depends on how many people you plan on carrying, and how far offshore you go.

An OUPV license allows you to carry up to 6 paying passengers, on an uninspected vessel.
A Master's license does not have any restrictions on number of passengers onboard, and allows operation of inspected or uninspected vessels.
The maximum vessel tonnage under an OUPV license is 100 GRT. This GRT limit does not change.
A Master's license allows you to operate vessels up to the GRT limit listed on your license. With additional Sea Days this limit can be increased when you renew your license.
An OUPV is limited to the waters described in the license; i.e. OUPV Inland can operate on Inland waters, similarly for OUPV Great Lakes on the Great Lakes. An OUPV NC can operate on waters out to 100 nautical miles offshore.
A Master's License on Inland or Great Lakes allows for operation of vessels within the prescribed waters (Inland, Great Lakes). A Near Coastal Master's license allows for operation offshore. There is no 100 nautical miles offshore restriction.

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. An MM-SEAS Navita Navigator walks you through submitting in Navita, the Coast Guard's new submission portal, on a short video call. No computer, or not up for a video call? Our team gets your application submitted to the Coast Guard for you anyway. 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.
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Nate Gilman is President and Co-Founder of MM-SEAS. He hawsepiped from the deck to a 3rd Mate Unlimited license with full STCW compliance over more than 15 years at sea, and is a veteran of the NOAA Commissioned Corps. He works directly with the National Maritime Center, USCG-approved training schools, and vessel operators on credentialing policy, and writes on sea service documentation, evaluation standards, and how mariners move up the license ladder.