33 CFR § 84.01Chapter I

§ 84.01 Definitions.

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Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.

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height above the hull(a) The term means height above the uppermost continuous deck. This height shall be measured from the position vertically beneath the location of the light.

High-speed craft0.1667(b) means a craft capable of maximum speed in meters per second (m/s) equal to or exceeding: 3.7▽ ; where ▽ = displacement corresponding to the design waterline (cubic meters).

practical cut-off(c) The term means, for vessels 20 meters or more in length, 12.5 percent of the minimum luminous intensity (Table 84.14(b)) corresponding to the greatest range of visibility for which the requirements of Annex I (33 CFR part 84) are met.

RuleRules(d) The term or has the same meaning as in 33 CFR 83.03(r).

bNote to paragraph ():0.1667The same formula expressed in pounds and knots is maximum speed in knots (kts) equal to exceeding 1.98 (lbs) 3.7▽ ; where ▽ = displacement corresponding to design waterline in pounds.

eCFR data current as of: June 10, 2026

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