---
kind: "unit"
title: "33"
title_heading: "Navigation and Navigable Waters"
key: "chI/subchD/part81"
level: "part"
label: "Part 81"
heading: "72 Colregs: Implementing Rules"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/33/chI-subchD-part81"
sections_count: 7
---

# Part 81 — 72 Colregs: Implementing Rules

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

## Sections

- [§81.1. Definitions.](/cfr/33/81.1.md)
- [§81.3. General.](/cfr/33/81.3.md)
- [§81.5. Application for a Certificate of Alternative Compliance.](/cfr/33/81.5.md)
- [§81.9. Certificate of Alternative Compliance: Contents.](/cfr/33/81.9.md)
- [§81.17. Certificate of Alternative Compliance: Termination.](/cfr/33/81.17.md)
- [§81.18. Notice and record of certification of vessels of special construction or purpose.](/cfr/33/81.18.md)
- [§81.20. Lights and sound signal appliances.](/cfr/33/81.20.md)