46 C.F.R. § 11.604
Requirements for an STCW endorsement for Global Maritime Distress and Safety System (GMDSS) Radio Operator
Each applicant for an original endorsement must provide a certificate of completion from a Coast Guard-approved course for operator of radio in the GMDSS meeting the requirements of Section A-IV/2 of the STCW Code (incorporated by reference, see § 11.102 of this part).