🔍 Key Concepts

• 46 CFR Part 4 – Marine Casualties and Investigations • What counts as a reportable marine casualty for a MODU (Mobile Offshore Drilling Unit) • The meaning of "international" grounding and whether any threshold or condition must be met

💭 Think About

• Think about why the Coast Guard wants to know about a MODU grounding in international waters. Is the concern limited to certain severities, or is any occurrence important? • Consider whether casualty reporting rules usually depend on duration (time aground), on hazard created, or simply on the fact that a casualty occurred. • Compare how strict reporting is for offshore units that can affect the environment and navigation, versus ordinary commercial vessels.

✅ Before You Answer

• Check in 46 CFR Part 4, Subpart 4.05 (Notice of Marine Casualty) how broadly the reporting requirement is written for masters/persons in charge. • Verify whether the regulation lists specific conditions (e.g., hazard to navigation, time limit) or uses broad/"any" language for groundings. • Confirm whether a MODU grounding, by its nature, is treated as a serious reportable event regardless of apparent damage.