(a) Each passenger vessel must carry at least three immersion suits approved under approval series 160.171 for each lifeboat on the vessel.

(b) In addition to the requirements in paragraph (a) of this section, each passenger vessel must carry a thermal protective aid approved under approval series 160.174 for each person not provided with an immersion suit.

(c) The immersion suits and thermal protective aids required under paragraphs (a) and (b) of this section are not required if the passenger vessel operates only on routes between 32 degrees north and 32 degrees south latitude.