What document must be on board and available for inspection by an enforcement officer whenever a vessel is operated in South Carolina?

COI Certificate of Inspection

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It depends. If the boat is a recreational boat then the state Registration is the required document. The same is true for a boat carrying six or less paying passengers, and the operator must have a USCG License.

But if the boat is carrying more than six paying passengers then they must have two documents. One is the vessels US Coast Guard Documentation. The other is the Certificate of Inspection. However if the boat is operated on a lake where the US Coast Guard does not have jurisdiction, then they must have the same documents but from the State of South Carolina.