The Short Version
If you want to carry paying passengers on a vessel up to 65 feet, take no more than 6 passengers at a time, and stay within 100 miles of shore, the OUPV (Operator of Uninspected Passenger Vessels) — commonly called the 6-pak license — is your starting point. If you want to run larger vessels, carry more passengers, or advance your maritime career, you need the 100-Ton Master.
In my years running charters, I've watched a lot of people get the wrong license for their goals, or undershoot when they should have reached for the 100-Ton from the start. Let me save you that mistake.
What OUPV Actually Means
OUPV stands for Operator of Uninspected Passenger Vessels. "Uninspected" refers to the vessel classification under federal law — it doesn't mean the boat is a wreck. Vessels carrying 6 or fewer passengers for hire typically fall into this category and aren't subject to USCG vessel inspection requirements that apply to larger passenger operations.
Your OUPV credential is what allows you to be the master (the legal responsible operator) of that vessel. Without it, you cannot legally accept money to take paying passengers on the water.
Passenger Limits: The Critical Difference
This is the most important distinction and the one that most directly affects your business:
- OUPV: Maximum 6 paying passengers. Period. That's where the nickname "6-pak" comes from — you can take a six-pack of customers out on the water.
- 100-Ton Master: On uninspected vessels, you're still capped at 6 passengers. But with a 100-Ton Near Coastal on an inspected vessel (a boat that has passed USCG inspection for passenger service), you can carry as many passengers as the vessel's Certificate of Inspection allows — sometimes 12, 20, 49, or more.
If your dream is running sunset cruises with 20 guests or a head-boat fishing operation, you need the 100-Ton Master and you need an inspected vessel. The OUPV gets you to 6 passengers only.
Vessel Size Limits
The "100-Ton" in the license name refers to Gross Register Tons (GRT), a measurement of vessel volume — not the vessel's weight. 100 GRT corresponds roughly to a vessel around 65 feet in length for a typical boat hull, though this varies significantly by hull design.
- OUPV: No explicit tonnage limit in the credential itself, but the vessels you'll work on are generally under 65 feet.
- 100-Ton Master: Authorizes you to serve as master of vessels up to 100 GRT. In practice, this covers most charter boats, whale watch vessels, sailing yachts up to about 65-70 feet, and many commercial vessels.
If you're working toward running larger commercial vessels — think dinner cruise ships, large excursion boats, or ferry operations — you'll eventually want the 200-Ton or 500-Ton Master. But for the vast majority of charter operators, the 100-Ton is exactly right.
Waters: Inland vs. Near Coastal
Both the OUPV and 100-Ton Master come in two route flavors:
- Inland: Rivers, lakes, bays, sounds, and protected waters. Generally speaking, anything on the inland side of the boundary lines established in 33 CFR Part 80.
- Near Coastal: Offshore ocean waters. Specifically, you can operate up to 100 nautical miles offshore on the Near Coastal route. This is what you need for offshore sport fishing, ocean whale watches, or coastal cruising beyond the inland demarcation lines.
Near Coastal is the more demanding credential and unlocks more opportunity. In my case, I run offshore charters, so Near Coastal was essential. If you're primarily doing lake fishing trips or river tours, Inland may be sufficient — but Near Coastal is worth the additional study effort for the flexibility it provides.
One important note: a Near Coastal credential covers inland waters too. If you pass the Near Coastal exam, you're covered everywhere within 100 miles offshore. It's a superset of the inland credential.
Exam Difficulty: How Much Harder Is the 100-Ton?
Honest answer: significantly harder, but not impossibly so.
The OUPV exam has 60 questions across 7 subject areas, with a 70-minute time limit. The passing score is 70% on most sections and 90% on Rules of the Road (COLREGS).
The 100-Ton Near Coastal exam has 120 questions across 8 subject areas, with a 150-minute time limit. Same passing percentages, but more material — notably adding celestial navigation, more advanced chart work, and deeper engineering/stability content.
The additional content for the 100-Ton includes:
- Celestial navigation (use of the nautical almanac, sight reduction)
- Vessel stability and loading calculations
- More complex chart work including current and tidal corrections
- Engineering knowledge (basic engine systems, pumps, electrical)
The Rules of the Road section is the same for both licenses — and it's the section most students struggle with because it requires 90%, not 70%.
Career Implications: Which One Opens More Doors?
The OUPV is the minimum credential to legally run a charter boat for hire in the United States. It's the entry point. If you're weekend chartering with a small group, guiding fishing trips, or running a small tour operation, it's sufficient.
The 100-Ton Master opens the door to:
- Commanding inspected passenger vessels (more than 6 passengers)
- Employment on commercial vessels as mate or master
- Qualifying for certain maritime employment positions that require a Master credential
- A clearer upgrade path to 200-Ton and 500-Ton Master credentials
- Teaching/instruction roles at maritime schools
If you're serious about a maritime career — not just weekend charters — start with the 100-Ton. The additional study time pays dividends for years.
Which Should You Get First?
Here's my honest recommendation after talking to hundreds of students:
Get the OUPV first if: You just want to start running charters as soon as possible, your immediate business only needs 6 passengers, or you want to verify the licensing process before committing to the harder exam.
Go straight for the 100-Ton if: You have any ambition beyond 6-passenger charters, you're considering maritime employment, or you're willing to put in 2-3 extra months of study. Your sea time requirements are similar, so the additional exam prep is the main difference.
You can upgrade from OUPV to 100-Ton later — you don't have to retake the whole exam, just the additional 100-Ton sections. But many students find it's cleaner to target the 100-Ton from the start rather than doing the exam process twice.
Cost Comparison
USCG fees are the same for both: approximately $140 for the initial credential at your Regional Examination Center. The difference is in study time, course costs if you take a prep course, and the time cost of potentially doing the process twice.
Study materials for the 100-Ton are more extensive — budget more time for chart work, celestial navigation practice, and the additional subject areas.
Getting Started
Whichever path you choose, the sea service requirements are your first hurdle. You need 360 days of sea service (at least 90 underway) on appropriate waters. Start documenting that now if you haven't — it's the clock that governs your timeline more than anything else.
Once you've logged enough sea time, the exam is your final step. Practice on the actual subject areas until you're consistently hitting 90%+ on Rules of the Road and 75%+ on everything else before you walk into the REC.
Ready to start practicing? OUPV practice questions and 100-Ton practice questions are both available in The Chartroom — you can drill the exact material for whichever credential you're targeting.