46 U.S.C. § 10306
Exhibiting merchant mariners’ documents
Before signing the agreement required by section 10302 of this title , each individual required by section 8701 of this title to have a merchant mariner’s document shall exhibit to the master or individual in charge a document issued to the individual, appropriately endorsed for the capacity in which the individual is to serve.
( Pub. L. 98–89 , Aug. 26, 1983 , 97 Stat. 564 ; Pub. L. 103–206, title IV, § 404 , Dec. 20, 1993 , 107 Stat. 2436 .)