33 CFR § 87.03 - Supplemental signals.

---
identifier: "/us/cfr/t33/s87.03"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "33 CFR § 87.03 - Supplemental signals."
title_number: 33
title_name: "Navigation and Navigable Waters"
section_number: "87.03"
section_name: "Supplemental signals."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "E"
subchapter_name: "INLAND NAVIGATION RULES"
part_number: "87"
part_name: "ANNEX IV: DISTRESS SIGNALS"
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 37925, July 2, 2014, unless otherwise noted."
cfr_part: "87"
---


# 87.03 Supplemental signals.

Attention is drawn to the relevant sections of the International Code of Signals, the International Aeronautical and Maritime Search and Rescue Manual, Volume III, the International Telecommunication Union Radio Regulations and the following signals:

(a) A piece of orange-colored canvas with either a black square and circle or other appropriate symbol (for identification from the air);

(b) A dye marker.