46 C.F.R. § 26.30-5 Use.
Title 46 - Shipping
(a) Approved buoyant work vests are considered to be items of safety apparel and may be carried aboard vessels to be worn by crew members when working near or over the water under favorable working conditions. (b) When carried, approved buoyant work vests shall not be accepted in lieu of any portion of the required number of approved lifesaving appliances required by §25.25–10 of this subchapter.
Title 46: Shipping
PART 26—OPERATIONS
Subpart 26.30—Work Vest
§ 26.30-5 Use.