46 C.F.R. § 10.459 Service requirements for master or mate of rivers.
Title 46 - Shipping
(a) An applicant for a license as master of river steam or motor vessels of any gross tons must meet the same service requirements as master of inland steam or motor vessels of any gross tons. (b) An applicant for a license as master or mate of river steam or motor vessels, with a limitation of 25–1600 gross tons, must meet the same service requirements as those required by this subpart for the corresponding tonnage Great Lakes and inland steam or motor license. Service on the Great Lakes is not, however, required. [CGD 81–059, 54 FR 141, Jan. 4, 1989]
Title 46: Shipping
PART 10—LICENSING OF MARITIME PERSONNEL
Subpart D—Professional Requirements for Deck Officers' Licenses
§ 10.459 Service requirements for master or mate of rivers.

