46 C.F.R. § 199.201
(a) Each survival craft must be approved and equipped as follows:
(2) Each inflatable liferaft must be approved under approval series 160.151 and equipped with—
(b) Each passenger vessel must carry the following:
(1) A combination of lifeboats and liferafts that have an aggregate capacity sufficient to accommodate the total number of persons on board, provided that—
(2) In addition to the survival craft required in paragraph (b)(1) of this section, additional liferafts must be provided that have an aggregate capacity sufficient to accommodate at least 25 percent of the total number of persons on board. The additional liferafts—
(d) Each passenger vessel that is less than 500 tons gross tonnage and is certificated to permit less than 200 persons on board is not required to meet the requirements of paragraphs (b) or (c) of this section if it meets the following:
(1) On each side of the vessel—