Section 15.850 - Lookouts(a) The requirements for the maintenance of a proper lookout are specified in Rule 5 of the International Regulations for Preventing Collisions at Sea, 1972 (33 U.S.C. 1602(c) ), and Rule 5 of the Inland Navigational Rules Act of 1980 ( 33 CFR part 83 ). Lookout is a function to be performed by a member of a navigational watch.(b) On vessels subject to STCW, the individual meeting the requirement of this section must also hold at least an STCW deck endorsement as rating forming part of a navigational watch, except as noted in § 15.105(g) of this part for vessels on domestic near-coastal voyages.USCG-2004-17914, 78 FR 78008 , Dec. 24, 2013