---
kind: "unit"
title: "33"
title_heading: "Navigation and Navigable Waters"
key: "chI/subchS/part173"
level: "part"
label: "Part 173"
heading: "Vessel Numbering and Casualty and Accident Reporting"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/33/chI-subchS-part173"
sections_count: 28
---

# Part 173 — Vessel Numbering and Casualty and Accident Reporting

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

## Contents

- [Subpart A — General](/cfr/33/chI-subchS-part173-subpartA.md)
- [Subpart B — Numbering](/cfr/33/chI-subchS-part173-subpartB.md)
- [Subpart C — Casualty and Accident Reporting](/cfr/33/chI-subchS-part173-subpartC.md)
- [Subpart D — Issue of Certificate of Number](/cfr/33/chI-subchS-part173-subpartD.md)