The district court correctly upheld the Coast Guard Commandant’s decision as his interpretation of 46 C.F.R § 4.05-10(b) was not arbitrary or capricious. See Citizens to Preserve Overton Park, Inc. v. Volpe, 401 U.S. 402, 416, 91 S.Ct. 814, 823-24, 28 L.Ed.2d 136 (1971). It was not arbitrary or capricious to decide that a three-day delay of the written report failed to meet the “without delay” requirement of the statute if the written report is to satisfy the immediate notice requirement in 46 C.F.R. § 4.05-1(a). AFFIRMED.