46 CFR § 11.431
Tonnage requirements for Great Lakes and inland endorsements for vessels of 1,600 GRT or more
April 15, 2021
(a) All required experience for Great Lakes and inland unlimited endorsements must be obtained on vessels of 100 GRT or more. At least one-half of the required experience must be obtained on vessels of 1,600 GRT or more.
(b) Tonnage limitations may be imposed on these endorsements in accordance with §11.402(b) and (c) of this subpart.