---
kind: "unit"
title: "33"
title_heading: "Navigation and Navigable Waters"
key: "chI/subchH/part101"
level: "part"
label: "Part 101"
heading: "Maritime Security: General"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/33/chI-subchH-part101"
sections_count: 46
---

# Part 101 — Maritime Security: General

Title 33 C.F.R. — Navigation and Navigable Waters › Chapter I — Coast Guard, Department of Homeland Security › Subchapter H — Maritime Security

## Contents

- [Subpart A — General](/cfr/33/chI-subchH-part101-subpartA.md)
- [Subpart B — Maritime Security (MARSEC) Levels](/cfr/33/chI-subchH-part101-subpartB.md)
- [Subpart C — Communication (Port—Facility—Vessel)](/cfr/33/chI-subchH-part101-subpartC.md)
- [Subpart D — Control Measures for Security](/cfr/33/chI-subchH-part101-subpartD.md)
- [Subpart E — Other Provisions](/cfr/33/chI-subchH-part101-subpartE.md)
- [Subpart F — Cybersecurity](/cfr/33/chI-subchH-part101-subpartF.md)