46 U.S.C. § 55333
Exemption from restriction on transporting certain cargo
The 3-year documentation requirement of section 55305(a) of this title does not apply to a vessel designated as an American Great Lakes vessel during the period of its designation.
( Pub. L. 109–304, § 8(c) , Oct. 6, 2006 , 120 Stat. 1649 .)