🔍 Key Concepts

• Certificate of Inspection (COI) validity periods in 46 CFR for different vessel types • Special rules for mobile offshore drilling units (MODUs) versus inspected vessels like tankships or passenger vessels • Difference between COI period and reinspection/annual inspection intervals

💭 Think About

• Think about whether offshore drilling units are treated more like regular inspected vessels or like a special offshore category with longer certification cycles • Consider how often it is practical to drydock or fully recertify an offshore drilling unit that may be on location for long periods • Recall the standard maximum COI validity period the Coast Guard uses for most inspected vessels and ask whether MODUs are an exception or follow that same maximum

✅ Before You Answer

• Confirm in 46 CFR Subchapter I-A (Mobile Offshore Drilling Units) what the maximum COI period is • Distinguish between COI duration and required periodic or annual inspections in between — these are not the same number of months • Check whether any of the shorter options listed (24, 36, 48 months) match a common inspection interval rather than the actual COI validity period