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The 12-passenger limit is the most consequential number in day charter and the one most clients learn about for the first time after they have already counted heads. A group of 16 books a 30m motor yacht in Mykonos, the operator confirms, the deposit is paid, and three weeks before the date the client gets a polite note from the broker explaining that the manifest must be cut to 12 plus crew. The standard fix the broker proposes (a second tender, an "annex" yacht, splitting into two parties at lunch) is mostly the broker hoping the port police are not in the bay that day. Sometimes they are.
This post sorts the rule and the workarounds. The short version: above 12 guests, the product you actually want is a passenger-classed vessel, and there are not many of them.
Where the 12-passenger number comes from
The International Convention for the Safety of Life at Sea (SOLAS) and the implementing flag-state rules class any commercial vessel carrying 13 or more passengers (defined as persons other than crew) as a passenger ship. The compliance regime for a passenger ship is materially stricter than the commercial-yacht regime: full SOLAS subdivision and damage stability, lifeboat capacity for 100 percent of POB, additional fire-detection, additional crew certification under the STCW Passenger Ship Familiarisation Code, and a heavier survey and class regime under MCA, RINA, BV, or equivalent.
Charter yachts are mostly classed under the Large Yacht Code (the UK MCA LY3 framework or the equivalents) or under flag-state private-yacht rules. The Large Yacht Code permits 12 passengers and the supporting crew. It does not permit 13 or more. A yacht classed as a Large Yacht cannot legally day-charter 13 guests, anywhere. The number is hard. It is not a recommendation, a guideline, or a soft cap.
The exception is the small fleet of yachts in commercial charter that hold a Passenger Ship Safety Certificate under the Passenger Yacht Code (a framework run by the Cayman Islands flag and adopted by several others). These yachts are designed and built to carry up to 36 passengers commercially. They are rare, expensive, and almost entirely owned by the largest charter operators in the Caribbean and the Med.
What this means for the booking conversation
If you are booking a day charter for a group of 1 to 12 guests, the 12-pax rule does not affect you. Every commercial-classed yacht on the market is on the table.
If your group is 13 or more, you have three options.
The first is to book a passenger-classed yacht. In the Mediterranean, this means yachts like the Mykonos-based catamaran fleets that run scheduled cruises for 40+, the Ibiza catamarans that hold 30+, and a small number of motor yachts built to the Passenger Yacht Code in Saint-Tropez and Cannes. The day rate on these yachts is €4,000 to €15,000 depending on size and operator. The yachts are not Large Yacht private commercials. They look different (more deck space, less interior, more bench seating, no master cabins to speak of) and they feel like a commercial day-trip vessel because they are.
The second is to book two yachts. This is the route 80 percent of clients in this group-size band end up taking. It works if you accept the constraint that the two yachts are independent operations and the parties do not merge. You will have two captains, two manifests, two arrival times, two fuel bills, and two tenders. The yachts can anchor near each other. They cannot raft up and they cannot transfer guests in numbers that exceed the per-yacht limit, which is to say, if Yacht A has 8 aboard and Yacht B has 8 aboard, you cannot move 5 from A to B and end up with 13 on B and 3 on A. This is enforced. The operators know this. They do not always tell the client.
The third is to drop guests. The most expensive line item in any day charter is usually the food and drink for the over-12 portion of a group. If the group has a soft 14 to 18 size and the actual decision-makers are 10, cut down. We have watched clients book a 30m yacht for 14, get the cut-down notice from the operator, and end up with the original 14 on board with two extras described as "crew" in the manifest. The port police boarded in Cala Salada off Ibiza in July 2024. The fine was €4,000, paid by the operator, and the operator added it to the client invoice as a "regulatory adjustment." This is now a standard line item in some Ibiza contracts. Read the small print.
The destinations that enforce
Croatian, Greek, French, and Spanish port police have all stepped up day-charter enforcement since 2022. The Spanish port authority in Ibiza runs targeted check days in July and August at Cala Bassa, Cala Salada, Es Vedrà, and the south coast of Formentera. Croatian harbour police board at Pakleni and the Hvar buoy field. Greek port authorities board most commonly at Delos, Rhenia, and the south coast of Naxos. The French police nautique work the Saint-Tropez bay, the Iles d'Or, and the Cannes Estérel coast.
Less enforced (but still illegal): the BVI, USVI, Turkey, and the eastern Aegean. In the Caribbean, the operators police themselves more than the state does, because the insurance loss is the binding constraint. An over-limit day charter that hits a swimmer in a busy bay is uninsured. The operator loses the yacht.
The catamaran answer
The single most-overlooked product for groups of 13 to 24 is the commercial day-charter catamaran. The catamaran fleet in Mykonos (operators including SeaSide Cruises, Don Blue, and a half-dozen others) runs purpose-built passenger-classed cats of 60ft to 80ft, with sun deck, shaded bench seating, water toys, full bar, and a small galley. Day rates run €3,500 to €8,000 for the private charter of the whole vessel. The product is not a yacht in the editorial sense (no cabins worth using, no chef, no proper saloon), but for a 16-pax group that wants to be on the water for 8 hours with snorkelling, swimming, and lunch, the catamaran is the right call.
The same pattern works in Ibiza, Phuket, Cabo, and Cancún. In Cannes, Saint-Tropez, and Antibes, the catamaran market is thin and most large-group charters go to the passenger-classed motor yachts, which are 2 to 3 times the price.
What we said no to
The "two yachts rafted together with a single host" play. We have seen operators in Hvar and Cala Salada offer this with a straight face. Two 22m yachts, rafted, with a shared tender ferrying guests across. The operator describes this as "a flotilla configuration." The port police describe it as exceeding the passenger limit. The client signs a waiver that, when tested in 2023 in a court in Split, was found unenforceable against state regulatory action. The fine was paid by the client, on top of the charter cost, and the trip was terminated at noon. Pass.
The other thing we would pass on is the operator who quotes a 12-pax yacht for "12 adults and 4 children, the kids don't count." Children count. Infants under one year are excluded from the manifest in most flag-state rules, but every person aboard above that age counts toward the 12. If the operator says otherwise, they are misrepresenting their own classification.
How to brief the broker
When you book, give the broker the actual head count. Include adults, children, and any "plus one" you expect to add later. If the count is 12 or under, you have the whole commercial fleet to choose from. If the count is 13 to 18, ask the broker specifically for passenger-classed catamarans or for two-yacht options where the captains have worked together before. If the count is 19+, you are in the small-cruise market and the conversation is different (and the prices are €15,000+ a day).
The single most-asked follow-up question is whether children count. They do. Ask the broker to confirm in writing the manifest count and the certificate class of the yacht. If you get a vague answer, the broker is offloading regulatory risk.