Section 155.5021 - Operating restrictionsNontank vessels subject to this subpart may not-
(a) Operate upon the navigable waters of the United States unless in compliance with a vessel response plan (VRP) approved under § 155.5065 .(b) Continue to operate on the navigable waters of the United States if- (1) The Coast Guard determines that the response resources identified in the vessel's certification statement do not meet the requirements of this subpart;(2) The contracts or agreements required in §§ 155.5050 and 155.5052 and the vessel's certification statement are no longer valid;(3) The vessel is not operating in compliance with the submitted VRP; or(4) The period of the VRP authorization has expired.