; (2) by redesignating subparagraph (C) as subparagraph (D); (3) by inserting after subparagraph (B) the following: (C) As applied to the Coast Guard, the term eligible operations and maintenance means all operations and maintenance reasonably necessary to relocate or establish a Federal navigational aid necessary for a navigation improvement project. ; and (4) in subparagraph (D), as redesignated, by striking the period at the end and inserting , except as applied to the Coast Guard under subparagraph (C). . 306. Equipment requirements; exemption from throwable personal flotation devices Not later than 180 days after the date of enactment of this Act, the Secretary of the department in which the Coast Guard is operating shall revise section 175.17 of title 33, Code of Federal Regulations, to exempt paddleboards and rafts from the requirement for carriage of an additional throwable personal flotation device if each person is required to wear a personal flotation device while under way and at least 1 rescue throw bag, as typically used in whitewater rafting, is on board. 307. Ensuring maritime coverage In order to meet all of the mission requirements of its maritime response program, as the Coast Guard recapitalizes assets, it shall ensure continuity of the coverage currently provided by that program to locations that may lose assets. 308. Deadline for compliance with alternate safety compliance program (a) In general Section 4503(d) of title 46, United States Code, is amended— (1) in paragraph (1), by striking After January 1, 2020, and all that follows through the Secretary, if and inserting Subject to paragraph (3), beginning on the date that is 3 years after the date that the Secretary prescribes an alternate safety compliance program, a fishing vessel, fish processing vessel, or fish tender vessel to which section 4502(b) of this title applies shall comply with the alternate safety compliance program if