Section 11.437 - Requirements for mate of Great Lakes and inland self-propelled vessels of unlimited tonnage(a) The minimum service required to qualify an applicant for an endorsement as mate of Great Lakes and inland self-propelled vessels of unlimited tonnage is- (1) Three years of service in the deck department of self-propelled vessels, at least 3 months of which must have been on vessels on inland waters and at least 6 months of which must have been while performing bridge watchkeeping duties under the supervision of the master or a qualified officer;(2) Graduation from the deck class of the Great Lakes Maritime Academy; or(3) While holding a license or MMC endorsement as master of Great Lakes and inland self-propelled vessels of less than 1,600 GRT, 1 year of service as master on vessels of 200 GRT or more. A tonnage limitation may be placed on this license in accordance with § 11.431 of this subpart.(b) Service gained in the engine department on vessels of appropriate tonnage may be creditable for up to 6 months of the service requirements under paragraph (a)(1) of this section.