🔍 Key Concepts

• Load line / Plimsoll mark and what it represents for any vessel or mobile offshore drilling unit • Difference between a vessel’s actual draft at any moment and the maximum legal or safe draft • How regulations limit how deeply a unit may be loaded in various seasons/zones

💭 Think About

• Which of these terms refers specifically to a regulatory limit on how deep the hull may be submerged, rather than just a measurement or an average? • Think about what surveyors and classification societies mark on the side of a hull to show the maximum allowable loading condition. • Does the word used in any choice remind you of marks painted on the ship’s side that change with water density or season?

✅ Before You Answer

• Identify which option is tied to regulatory safety limits, not just a descriptive measurement • Ask: which term would appear on official certificates and hull markings rather than in a stability calculation only? • Eliminate any choices that only describe a simple measurement of depth without implying a legal or safety limit.