Section 180.72 - Personal flotation devices carried in addition to life jackets(a) Equipment carried under this section is not acceptable in lieu of any portion of the required number of approved life jackets and must not be substituted for the approved life jackets required to be worn during drills and emergencies.(b) Wearable marine buoyant devices that include "ski vests," "boating vests," and "fishing vests," approved in accordance with § 160.064 in subchapter Q of this chapter, or other standard specified by the Commandant, may be carried as additional equipment.(c) Buoyant work vests approved in accordance with § 160.053 in subchapter Q of this chapter, or other standard specified by the Commandant, may be carried as additional equipment for use of persons working near or over the water.(d) Commercial hybrid personal flotation devices (PFD) approved in accordance with § 160.077 of this chapter, or other standard specified by the Commandant, may be carried as additional equipment for use of persons working near or over the water. Each commercial hybrid PFD must be:(1) Used, stowed, and maintained in accordance with the procedures set out in the manual required for these devices under § 160.077-29 in subchapter Q of this chapter and any limitation(s) marked on them; and(2) Of the same or similar design and have the same method of operation as each other hybrid PFD carried on board.