33 CFR § 89.1 - Definitions.
---
identifier: "/us/cfr/t33/s89.1"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "33 CFR § 89.1 - Definitions."
title_number: 33
title_name: "Navigation and Navigable Waters"
section_number: "89.1"
section_name: "Definitions."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "E"
subchapter_name: "INLAND NAVIGATION RULES"
part_number: "89"
part_name: "INLAND NAVIGATION RULES: IMPLEMENTING RULES"
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. 2071; 49 CFR 1.46(n)(14)."
regulatory_source: "CGD 80-157, 47 FR 13801, Apr. 1, 1982, unless otherwise noted."
cfr_part: "89"
---
# 89.1 Definitions.
As used in this subpart:
*Inland Rules* refers to the Inland Navigation Rules contained in the Inland Navigational Rules Act of 1980 (Pub. L. 96-591) and the technical annexes established under that act.
*A vessel of special construction or purpose* means a vessel designed or modified to perform a special function and whose arrangement is thereby made relatively inflexible.
*Interference with the special function of the vessel* occurs when installation or use of lights, shapes, or sound-signaling appliances under the Inland Rules prevents or significantly hinders the operation in which the vessel is usually engaged.
[CGD 80-157, 47 FR 13801, Apr. 1, 1982, as amended by CGD 83-028, 49 FR 33876, Aug. 27, 1984]