Section 173.81 - Coast Guard forms for numbering and casualty reporting(a) In a State where the Coast Guard is the issuing authority, the following Coast Guard forms must be used:(1) Each application for a certificate of number or renewal must be made on two-part Form CG-3876 and 3876A, Application for Number and Temporary Certificate.(2) Each notification required by § 173.29(b) must be made on Form CG-2921, Notification of Change in Status of Vessel.(3) Each notification required by § 173.29(a) must be made on Form CG-3920, Change of Address Notice.(4) Each notification required by § 173.29(c) must be made in writing.(5) Each application for a duplicate certificate of number must be made on two-part Form CG-3919 and CG-3919A, Application for Duplicate Certificate of Number and Temporary Duplicate Certificate.(6) Each vessel casualty required to be reported by § 173.55 must be made on Form CG-3865.(b) Each surrender of a certificate of number required by § 173.31 may be made in any form but must contain a written statement as to why the certificate is being surrendered.