🔍 Key Concepts

• 46 CFR requirements for logs and records on Mobile Offshore Drilling Units (MODUs) • Difference between official logbooks and unofficial/voluntary records • Typical USCG record‑retention timeframes for vessel documentation

💭 Think About

• Ask yourself: Is an unofficial logbook likely to have the same, shorter, or longer retention time than an official one? Why? • Think about why regulators want records kept: what kinds of investigations or inspections might rely on these logs, and how far back might they need to look? • Compare the four choices with other common maritime record periods you may have studied (e.g., oil record books, station bills, training records). Which option best matches those patterns for important safety records?

✅ Before You Answer

• Verify in 46 CFR what is said about record retention on MODUs and note any references to logbooks or operating records. • Check whether the requirement is tied to a fixed time period (in months/years) or an event (such as next inspection). • Confirm whether unofficial logs, when maintained, are expected to be preserved as if they were official records for investigation and compliance purposes.