When the Secretary is the authority issuing a number under this chapter, the Secretary may exempt a vessel or class of vessels from the numbering requirements of this chapter under conditions the Secretary may prescribe.
When a State is the issuing authority, it may exempt from the numbering requirements of this chapter a vessel or class of vessels exempted under subsection (a) of this section or otherwise as permitted by the Secretary.
(Pub. L. 98–89, Aug. 26, 1983, 97 Stat. 591.)