California Code, Harbors and Navigation Code - HNC § 656.2

In addition to the requirements of Section 656.1, the operator of any vessel involved in an accident in the waters of this state who knows or has reason to know that the accident resulted in injury to any person shall furnish his or her name, address, and the registration number of the vessel, and the name of the owner, to the person injured, or occupant of any other vessel involved, or shall furnish that information to any peace officer at the scene of the accident, and shall render to any injured person reasonable assistance, including transportation for medical treatment if required or requested by the injured person, so far as the operator can do so without serious danger to the vessel or passengers.