46 CFR § 78.23-1 - Unnecessary whistling prohibited.

---
identifier: "/us/cfr/t46/s78.23-1"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 78.23-1 - Unnecessary whistling prohibited."
title_number: 46
title_name: "Shipping"
section_number: "78.23-1"
section_name: "Unnecessary whistling prohibited."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "H"
subchapter_name: "PASSENGER VESSELS"
part_number: "78"
part_name: "OPERATIONS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "33 U.S.C. 1321(j); 46 U.S.C. 2103, 3306, 6101; 49 U.S.C. 5103, 5106; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; E.O. 12777, 56 FR 54757, 3 CFR, 1991 Comp., p. 351; Department of Homeland Security Delegation No. 0170.1."
regulatory_source: "CGFR 65-50, 30 FR 16955, Dec. 30, 1965, unless otherwise noted."
cfr_part: "78"
---


# 78.23-1 Unnecessary whistling prohibited.

(a) The unnecessary sounding of the vessel's whistle is prohibited within any harbor limits of the United States.

(b) [Reserved]