46 C.F.R. § 15.816
Every person in the required complement of deck officers, including the Master, on seagoing vessels equipped with automatic radar plotting aids (ARPA), except those vessels listed in § 15.105(f) and (g), must hold an appropriate STCW endorsement valid for vessels equipped with ARPA.
[USCG-2004-17914, 78 FR 78007, Dec. 24, 2013]