OUPV vs Master license: which do you need?
Quick answer
Should you get an OUPV or a Master license?
Choose OUPV (Operator of Uninspected Passenger Vessels, the six-pack) if you will carry six or fewer paying passengers on an uninspected vessel. Choose a Master license for more than six passengers or an inspected vessel. Master licenses are tiered by tonnage: 25, 50, or 100 gross register tons, set by your documented sea time.
This is the fork almost every new applicant has to settle before they do anything else, because it decides which sea time to document, which exam to sit, and how much the whole thing costs. The good news is that the deciding question is simple and it is not about prestige. It is about what you actually plan to carry.
Both licenses are officer endorsements on a U.S. Coast Guard Merchant Mariner Credential (MMC) issued by the National Maritime Center (NMC). This site is independent and is not the Coast Guard, the NMC, or a course provider.
What is the difference between OUPV and Master?
The dividing line is six passengers and vessel inspection.
- OUPV (the six-pack) authorizes you to carry up to six paying passengers on an uninspected vessel. It is the entry-level license and it is tied to the person, not to a tonnage.
- A Master license authorizes you to command an inspected passenger vessel and to carry more than six paying passengers, up to the limits of the vessel’s certificate. It is tiered by vessel tonnage.
Everything else, the sea-time total, the medical certificate, the TWIC, flows from that one choice. If your whole plan is six-or-fewer anglers on your own boat, the OUPV is the correct and cheaper answer, and buying a bigger license does not help you. If you will ever carry a seventh paying passenger, the OUPV does not cover you and you need a Master.
How the Master tonnage tiers work
A Master license comes in graded tonnage tiers, most commonly 25, 50, and 100 gross register tons (GRT). The tier you can earn is set by the size of the vessels your documented sea time was earned on, not by which tier you would like.
- Master 25 Ton: the common entry Master tier, for smaller inspected vessels.
- Master 50 Ton: mid-range, requiring qualifying time on larger vessels.
- Master 100 Ton: the top of the small-vessel range, the classic “100-ton Master” that charter and tour captains aim for.
You cannot simply pick 100 tons. You need enough sea time on vessels large enough to support that tonnage, which is why many applicants earn a lower tier first and raise it as their experience on bigger boats accumulates. The sea-time calculator records the tonnage of each vessel you enter so you can see which tier your log supports.
OUPV vs Master, side by side
| OUPV (six-pack) | Master 25 / 50 / 100 Ton | |
|---|---|---|
| Paying passengers | Up to 6 | More than 6, to the vessel’s limit |
| Vessel | Uninspected | Inspected |
| Tonnage | Effectively under 100 GRT | Tiered: 25, 50, or 100 GRT |
| Sea time | 360 documented days | 360 documented days, on vessels of qualifying tonnage |
| Exam | Lighter: no advanced tonnage/plotting module | Heavier: adds chart plotting and tonnage material |
| Typical fit | Charter fishing, dive, instruction, owner trips | Tour boats, larger charters, inspected passenger vessels |
| Cost | Lower course and fee load | Higher course cost and exam load |
Do OUPV and Master need the same sea time?
Both require 360 days of documented service with 90 recent, earned since your 16th birthday, and both split near-coastal from inland the same way (see the sea-time requirements guide). The difference is tonnage: for a Master tier, a meaningful portion of your days must be on vessels large enough to support that tonnage, and the NMC looks at the tonnage recorded on your CG-719S sea-service forms. So two applicants can have the same 360 days and qualify for different licenses purely on the size of the boats they served on.
Which should you choose?
Work backward from your actual plan:
- Six or fewer passengers, uninspected vessel, ever: OUPV. It is cheaper, the exam is lighter, and it fully covers you.
- More than six passengers, or an inspected vessel: Master, at the highest tonnage tier your documented sea time supports.
- Unsure, or growing a business: many captains start with the OUPV and upgrade to a Master later, because the sea time and most of the exam carry over.
Whichever you choose, the path, the forms, and the wait are the same shape: see how to get a captain’s license and the all-in cost guide.
Sources: 46 CFR Part 11 (officer endorsements, tonnage, and route rules) via ecfr.gov and the public National Maritime Center OUPV and Master checklists (dco.uscg.mil/nmc), verified 2026-07-22. Tonnage eligibility depends on documented vessel tonnage; the National Maritime Center makes the final determination on every application. This guide describes the public rule and is not legal advice.