33 CFR 173.15 : Navigation And Navigable Waters (§ 1.01-1 To Parts 404-499) — (§ 125.01 To Parts 188-199) — Coast Guard, Department Of Homeland Security (Continued) (§ 125.01 To Parts 188-199) — Boating Safety (§ 173.1 To Parts 188-199) — Vessel Numbering And Casualty And Accident Reporting (§ 173.1 To Appendix A To Part 173) — Numbering (§ 173.11 To § 173.35) — Vessel number required.

(a) Except as provided in § 173.17, no person may use a vessel to which this part applies unless:

(1) It has a number issued on a certificate of number by the issuing authority in the State of principal operation; and

(2) The number is displayed as described in § 173.27.

(b) This section does not apply to a vessel for which a valid temporary certificate has been issued to its owner by the issuing authority in the State of principal operation.