California Code, Vehicle Code - VEH § 9852.5

(a) A vessel may be registered in the names of two or more persons as coowners in the alternative by the use of the word “or.” A vessel so registered in the alternative shall be deemed to be held in joint tenancy. Each coowner shall be deemed to have granted to the other coowners the absolute right to dispose of the title and interest in the vessel. Upon the death of a coowner the interest of the decedent shall pass to the survivor as though title or interest in the vessel was held in joint tenancy unless a contrary intention is set forth in writing upon the application for registration.

(b) A vessel may be registered in the names of two or more persons as coowners in the alternative by the use of the word “or” and if declared in writing upon the application for registration by the applicants to be community property, or tenancy in common, shall grant to each coowner the absolute power to transfer the title or interest of the other coowners only during the lifetime of such coowners.

(c) A vessel may be registered in the names of two or more persons as coowners in the conjunctive by the use of the word “and” and shall thereafter require the signature of each coowner or his personal representative to transfer title to the vessel, except where title to the vessel is set forth in joint tenancy, the signature of each coowner or his or her personal representative shall be required only during the lifetime of the coowners, and upon death of a coowner title shall pass to the surviving coowner.

(d) The department may adopt suitable abbreviations to appear upon the certificate of ownership and certificate of number to designate the manner in which title to the vessel is held if set forth by the coowners upon the application for registration.