33 CFR § 181.21 - Purpose, applicability and effective dates.

---
identifier: "/us/cfr/t33/s181.21"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "33 CFR § 181.21 - Purpose, applicability and effective dates."
title_number: 33
title_name: "Navigation and Navigable Waters"
section_number: "181.21"
section_name: "Purpose, applicability and effective dates."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "S"
subchapter_name: "BOATING SAFETY"
part_number: "181"
part_name: "MANUFACTURER REQUIREMENTS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 4302; DHS Delegation 00170.1, Revision No. 01.4."
regulatory_source: "CGD 72-60, 37 FR 15779, Aug. 4, 1972, unless otherwise noted."
cfr_part: "181"
---


# 181.21 Purpose, applicability and effective dates.

This subpart prescribes the requirements for identification of boats to which section 46 U.S.C. 4301 applies.

[CGD 79-013, 48 FR 40718, Sept. 9, 1983, as amended by USCG-1998-3799, 63 FR 35534, June 30, 1998; USCG-1999-5832, 64 FR 34716, June 29, 1999]