Every person in the required complement of deck officers, including the master, on seagoing vessels equipped with a GMDSS, except those vessels listed in Sec. 15.105(f) and (g) of this part, must provide evidence of a valid STCW endorsement as GMDSS radio operator. [USCG-2004-17914, 78 FR 78007, Dec. 24, 2013]