{"data":{"id":"us/33-cfr-84.19","jurisdiction":"us","citation":"33 CFR 84.19","heading":"High-speed craft.","body":"(a) The masthead light of high-speed craft may be placed at a height related to the breadth of the craft lower than that prescribed in § 84.02(a)(i), provided that the base angle of the isosceles triangle formed by the sidelights and masthead light, when seen in end elevation is not less than 27°.\n(b) On high-speed craft of 50 meters or more in length, the vertical separation between foremast and mainmast light of 4.5 meters required by § 84.02(k) may be modified provided that such distance shall not be less than the value determined by the following formula:\nWhere:\ny is the height of the mainmast light above the foremast light in meters;\na is the height of the foremast light above the water surface in service condition in meters;\nΨ is the trim in service condition in degrees;\nC is the horizontal separation of masthead lights in meters.\nNote to § 84.19:\nRefer to the International Code of Safety for High-Speed Craft, 1994 and the International Code of Safety for High-Speed Craft, 2000.","path":["Title 33—Navigation and Navigable Waters","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER E—INLAND NAVIGATION RULES","PART 84—ANNEX I: POSITIONING AND TECHNICAL DETAILS OF LIGHTS AND SHAPES"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-33.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:35Z","sha256":"f712d0d16f7e7e8d1a8d7de80c8f29e988293b97fffa91a737545e8d889f7467","source_id":"us-cfr","stale":true,"prev":"us/33-cfr-84.18","next":"us/33-cfr-84.20"},"notice":"GroundRules: Original legal text. Not legal advice."}