Haw. Rev. Stat. § 431:10-226: Renewal of policy; new policy not required.

At the option of the insurer, any insurance policy terminating at a specified expiration date and not otherwise renewable, may be renewed or extended, upon a currently authorized policy form and at the premium rate then required for a specific additional period or periods by a certificate or by endorsement of the policy. The issuance of a new policy is not required.