CFR > Title 33 - Navigation and Navigable Waters > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER S—BOATING SAFETY (parts 173 to 188) > PART 173—VESSEL NUMBERING AND CASUALTY AND ACCIDENT REPORTING > SUBPART B—Numbering (§173.11 to §173.35) > 173.15—Vessel number required.

173.15—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 in which the vessel is principally used; 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 in which the vessel is principally used.