46 C.F.R. § 10.431 Tonnage requirements for Great Lakes and inland licenses for vessels of over 1600 gross tons.
Title 46 - Shipping
(a) All required experience for Great Lakes and inland unlimited licenses must be obtained on vessels of over 200 gross tons. At least one-half of the required experience must be obtained on vessels of 1600 gross tons or over. (b) Tonnage limitations may be imposed on these licenses in accordance with §10.402 (b) and (c).
Title 46: Shipping
PART 10—LICENSING OF MARITIME PERSONNEL
Subpart D—Professional Requirements for Deck Officers' Licenses
§ 10.431 Tonnage requirements for Great Lakes and inland licenses for vessels of over 1600 gross tons.

