46 CFR §11.435

1. (a)The minimum service required to qualify an applicant for an endorsement as Master of self-propelled vessels of unlimited tonnage on inland waters, excluding the Great Lakes is—
   1. (1)One year of service as First-Class Pilot (of other than canal and small lakes routes) or Mate of Great Lakes or inland self-propelled vessels of 1,600 GRT or more while holding an MMC endorsement as Mate inland or First-Class Pilot of Great Lakes and inland self-propelled vessels of unlimited tonnage; or
   2. (2)Two years of service performing bridge watchkeeping duties under the supervision of the Master or a qualified officer while holding a Mate/First-Class Pilot MMC endorsement.
2. (b)[Reserved]