🔍 Key Concepts

• Stability Data Reference Book blue pages and how to select the correct set of curves based on draft and trim • The relationship between GZ (righting arm) and KG (height of center of gravity) on the selected curves • Interpolating or reading the GZ value at a specific heel angle (15°) from the chosen curve

💭 Think About

• Which displacement/draft curve in the blue pages best matches the vessel’s forward and after drafts, and how do you handle any small trim difference? • Once you have the correct curve, where on that page do you find the GZ at 15°, and how does the given KG of 24.8 ft affect which plotted line or correction you should use? • Compare the GZ you read (in feet) with the answer choices and think about whether that magnitude makes sense for a ship at only 15° of heel.

✅ Before You Answer

• Be sure you are on the correct ship/condition page in the blue pages that matches this problem (right vessel and displacement range). • Verify you are using the right KG line or correction on the stability curve that corresponds to KG = 24.8 ft (or properly interpolated if needed). • Double-check the units and scale on the GZ axis so you read the righting arm in feet at exactly 15° before comparing to the choices.