(a) The watertight subdivision of every passenger vessel must be as efficient as possible, having regard to its intended service. This principle is given effect by applying the requirements in part 171 of this chapter.

(b) Passenger vessels engaged in foreign voyages by sea or coastwise voyages by sea or voyages on the Great Lakes, to be marked with subdivision load lines shall comply with the requirements in this part.

[CGFR 65-50, 30 FR 16769, Dec. 30, 1965, as amended by CGD 79-023, 48 FR 51007, Nov. 4, 1983]