Section 68.100 - Purpose and applicability(a) This subpart contains requirements for the documentation of U.S.-built vessels in the coastwise trade that were granted special rights under the Coast Guard and Maritime Transportation Action of 2004 (Pub. L. 108-293).(b) This subpart applies to- (1) A vessel under a demise charter that was eligible for, and received, a document with a coastwise endorsement under § 67.19 of this chapter and 46 U.S.C. 12106(e) before August 9, 2004;(2) A barge deemed eligible under 46 U.S.C. 12106(e) and 12110(b) to operate in coastwise trade without being documented before August 9, 2004; and(3) A replacement vessel of a similar size and function for any vessel under paragraphs (b)(1) through (b)(3) of this section.(c) Except for vessels under paragraph (d) of this section, this subpart applies to a certificate of documentation, or renewal of one, endorsed with a coastwise endorsement for a vessel under 46 U.S.C. 12106(e) or a replacement vessel of a similar size and function that was issued before August 9, 2004, as long as the vessel is owned by the person named in the certificate, or by a subsidiary or affiliate of that person, and the controlling interest in the owner has not been transferred to a person that was not an affiliate of the owner as of August 9, 2004.(d) With respect to offshore supply vessels with a certificate of documentation endorsed with a coastwise endorsement as of August 9, 2004, this subpart applies until August 9, 2007. On and after August 9, 2007, subpart C of this part applies to these vessels.