(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) 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 a license or MMC endorsement as mate inland or first-class pilot of Great Lakes and inland self-propelled vessels of unlimited tonnage; or

(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 license or MMC endorsement.

(b) [Reserved]