🔍 Key Concepts

• TPI (Tons per Inch Immersion) and how it relates to changes in draft • Relationship between displacement change and draft change • Converting between inches and feet when working with TPI

💭 Think About

• What information do you need to know (or be able to estimate) in order to figure out how many inches the draft will change when 275.8 long tons are discharged? • If the vessel becomes lighter, should the draft increase or decrease—and by roughly how much for a few hundred tons? • Once you estimate the draft change in inches, how do you convert that to feet to compare with the answer choices?

✅ Before You Answer

• Be clear on whether discharging 275.8 long tons makes the ship lighter or heavier. • Estimate a reasonable TPI value for a large vessel at 60 feet draft—does a few hundred tons usually change draft by several feet or just a small fraction of a foot? • After computing the change in draft, check the direction (up or down) and make sure the result is close to one of the listed choices.