CA Veh Code Section 9905

An owner who has made a bona fide sale or transfer of an undocumented vessel and has delivered possession of the vessel to a purchaser shall not by reason of any of the provisions of this code or the Harbors and Navigation Code be deemed the owner of the vessel so as to be subject to civil liability for the operation of the vessel thereafter by another when the owner, in addition to the foregoing, has fulfilled either of the following requirements:

(a)

Made proper endorsement and delivery of the certificate of ownership as provided in this code.

(b)

Delivered to the department or placed in the United States mail, addressed to the department, either the notice as provided in Sections 9911 and 9912 or appropriate documents for transfer of the vessel pursuant to the sale or transfer.