---
kind: "unit"
title: "46"
title_heading: "Shipping"
key: "chI/subchA/part4"
level: "part"
label: "Part 4"
heading: "Marine Casualties and Investigations"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/46/chI-subchA-part4"
sections_count: 85
---

# Part 4 — Marine Casualties and Investigations

Title 46 C.F.R. — Shipping › Chapter I — Coast Guard, Department of Homeland Security › Subchapter A — Procedures Applicable to the Public

## Contents

- [Subpart 4.01 — Authority and Scope of Regulations](/cfr/46/chI-subchA-part4-subpart4.01.md)
- [Subpart 4.03 — Definitions](/cfr/46/chI-subchA-part4-subpart4.03.md)
- [Subpart 4.04 — Notice of Potential Casualty](/cfr/46/chI-subchA-part4-subpart4.04.md)
- [Subpart 4.05 — Notice of Marine Casualty and Voyage Records](/cfr/46/chI-subchA-part4-subpart4.05.md)
- [Subpart 4.06 — Mandatory Chemical Testing Following Serious Marine Incidents Involving Vessels in Commercial Service, Floating OCS Facilities, or MODUs in Commercial Service](/cfr/46/chI-subchA-part4-subpart4.06.md)
- [Subpart 4.07 — Investigations](/cfr/46/chI-subchA-part4-subpart4.07.md)
- [Subpart 4.09 — Marine Board of Investigation](/cfr/46/chI-subchA-part4-subpart4.09.md)
- [Subpart 4.11 — Witnesses and Witness Fees](/cfr/46/chI-subchA-part4-subpart4.11.md)
- [Subpart 4.12 — Testimony by Interrogatories and Depositions](/cfr/46/chI-subchA-part4-subpart4.12.md)
- [Subpart 4.13 — Availability of Records](/cfr/46/chI-subchA-part4-subpart4.13.md)
- [Subpart 4.19 — Construction of Regulations and Rules of Evidence](/cfr/46/chI-subchA-part4-subpart4.19.md)
- [Subpart 4.21 — Computation of Time](/cfr/46/chI-subchA-part4-subpart4.21.md)
- [Subpart 4.23 — Evidence of Criminal Liability](/cfr/46/chI-subchA-part4-subpart4.23.md)
- [Subpart 4.40 — Coast Guard—National Transportation Safety Board Marine Casualty Investigations](/cfr/46/chI-subchA-part4-subpart4.40.md)