33 CFR § 101.645 - Communications.

---
identifier: "/us/cfr/t33/s101.645"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "33 CFR § 101.645 - Communications."
title_number: 33
title_name: "Navigation and Navigable Waters"
section_number: "101.645"
section_name: "Communications."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "H"
subchapter_name: "MARITIME SECURITY"
part_number: "101"
part_name: "MARITIME SECURITY: GENERAL"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 70101-70104 and 70124; Executive Order 12656, 3 CFR, 1988 Comp., p. 585; 33 CFR 1.05-1, 6.04-11, 6.14, 6.16, and 6.19; Department of Homeland Security Delegation No. 00170.1, Revision No. 01.4."
regulatory_source: "USCG-2003-14792, 68 FR 39278, July 1, 2003, unless otherwise noted."
cfr_part: "101"
---


# 101.645 Communications.

(a) The CySO must have a means to effectively notify owners or operators and personnel of a U.S.-flagged vessel, facility, or OCS facility of changes in cybersecurity conditions at the U.S.-flagged vessel, facility, and OCS facility and document these means in Section 5 of the Cybersecurity Plan.

(b) Communication systems and procedures must allow effective and continuous communications between U.S.-flagged vessel, facility, and OCS facility security personnel, vessels interfacing with a facility or an OCS facility, the cognizant COTP, and national and local authorities with security responsibilities.