Section 42.03-5 - U.S.-flag vessels subject to the requirements of this subchapter(a)Vessels engaged in foreign voyages or international voyages other than solely Great Lakes voyages.(1) All U.S. flag vessels which engage in foreign voyages or international voyages by sea (other than solely in Great Lakes voyages) are subject to this part; except the following: (ii) New vessels of less than 79 feet in length;(iii) Existing vessels of less than 150 gross tons;(iv) Pleasure yachts not engaged in trade; and(2) As provided in Article 4(4) of the 1966 Convention, in order for existing vessels to take advantage of any reduction in freeboards from those previously assigned, the regulations in subparts 42.13 to 42.25, inclusive, of this part shall be fully complied with. Except for due cause, such vessels shall not be required to increase their freeboards under the provisions of the 1966 Convention.(3) All U.S.-flag vessels authorized to engage in foreign or international voyages may also engage in domestic voyages by sea and, as permitted by § 45.9 of this part and part 47 of this subchapter, in Great Lakes voyages without additional load line marks and/or certificates. Where additional load line marks and certificates are provided to specifically cover "Special Service, Coastwise" or "Great Lakes" operation, such vessels are subject to the applicable provisions of parts 44 and 45 of this subchapter.(b)Vessels engaged in domestic voyages by sea.(1) All U.S.-flag vessels which engage in domestic voyages by sea (coastwise and intercoastal voyages) shall be subject to the applicable provisions of this part except the following: (i) Merchant vessels of less than 150 gross tons.(ii) Vessels which are mechanically propelled and numbered by a State or the Coast Guard under the Federal Boat Safety Act of 1971 ( 46 U.S.C. 1451 et seq.) and not required by other laws to be inspected or certified by the U.S. Coast Guard. (This exception includes all mechanically propelled vessels of less than 150 gross tons, and uninspected motor propelled oceanographic vessels of less than 300 gross tons while operating pursuant to 46 U.S.C. 2113 .(iii) Pleasure craft not used or engaged in trade or commerce.(iv) Barges of less than 150 gross tons.(v) Vessels engaged exclusively in voyages on waters within the United States or its possessions and which are determined not to be "coastwise" or "Great Lakes" voyages.(vii) U.S. public vessels other than those vessels of 150 gross tons or over and engaged in commercial activities.(2) In order for existing vessels to take advantage of any reduction in freeboards from those previously assigned, paragraph (a)(2) of this section applies.(c)Vessels engaged solely on Great Lakes voyages. A U.S. flag vessel 79 feet and more and 150 gross tons or over that engages solely on Great Lakes voyages is subject to the applicable provisions of this part and part 45 of this subchapter and must comply with the regulations in force on the date the keel is laid or a similar progress in construction is made.(d)Special service coastwise voyage. A U.S. flag vessel 150 gross tons or over that engages in a "special service coastwise voyage" is subject to the applicable provisions of this part and part 44 of this subchapter.(e)Hopper dredges engaged in limited service domestic voyages. Self-propelled hopper dredges over 79 feet (24 meters) in length with working freeboards, on limited service domestic voyages within 20 nautical miles (37 kilometers) from the mouth of a harbor of safe refuge, are subject to the provisions of this subchapter that apply to a Type "B" vessel and to the provisions of subpart E of part 44 of this chapter.CGFR 68-60, 33 FR 10049, July 12, 1968, as amended by CGFR 68-126, 34 FR 9011, June 5, 1969; CGD 73-49R, 38 FR 12289, May 10, 1973; CGD 80-120, 47 FR 5721, Feb. 8, 1982; CGD 86-016, 51 FR 9962, Mar. 24, 1986; CGD 76-080, 54 FR 36976, Sept. 6, 1989; CGD 97-057, 62 FR 51043, Sept. 30, 1997