46 C.F.R. § 189.01-1 When required.
Title 46 - Shipping
(a) Except as noted in this subpart or subpart 189.05 of this part, no vessel subject to inspection and certification shall be operated without a valid certificate of inspection.
Title 46: Shipping
PART 189—INSPECTION AND CERTIFICATION
Subpart 189.01—Certificate of Inspection
§ 189.01-1 When required.

