33 CFR § 84.19 - High-speed craft.

---
identifier: "/us/cfr/t33/s84.19"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "33 CFR § 84.19 - High-speed craft."
title_number: 33
title_name: "Navigation and Navigable Waters"
section_number: "84.19"
section_name: "High-speed craft."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "E"
subchapter_name: "INLAND NAVIGATION RULES"
part_number: "84"
part_name: "ANNEX I: POSITIONING AND TECHNICAL DETAILS OF LIGHTS AND SHAPES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "Sec. 303, Pub. L. 108-293, 118 Stat. 1042 (33 U.S.C. 2071); Department of Homeland Security Delegation No. 0170.1."
regulatory_source: "79 FR 37921, July 2, 2014, unless otherwise noted."
cfr_part: "84"
---


# 84.19 High-speed craft.

(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°.

(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:

Where:

*y* is the height of the mainmast light above the foremast light in meters;

*a* is the height of the foremast light above the water surface in service condition in meters;

Ψ is the trim in service condition in degrees;

*C* is the horizontal separation of masthead lights in meters.

Refer to the International Code of Safety for High-Speed Craft, 1994 and the International Code of Safety for High-Speed Craft, 2000.