🔍 Key Concepts

• Deadweight calculation (cargo + crew effects/stores + fuel) added to lightship displacement • Using the blue pages Hydrostatic/Capacity data in the Stability Data Reference Book to find draft for a given displacement • Effect of fresh water vs. salt water on draft (density/allowance)

💭 Think About

• First, think about how to get from the weights you are given (cargo, crew effects/stores, fuel) to a total deadweight, and then to a total displacement using the vessel’s lightship value from the book. • Once you have the approximate displacement, how do you use the displacement–draft table (or curves) in the blue pages to read off the mean draft in fresh water? • Consider whether any fresh-water correction or note in the tables needs to be applied, depending on whether the hydrostatic data is given for salt water or fresh water.

✅ Before You Answer

• Be sure you are using the correct lightship displacement figure from the reference book before adding the given loads. • Confirm whether the hydrostatic tables are labeled for salt water or fresh water and whether a density correction is needed. • Double-check that you are using the correct units (tons, feet, inches) and reading the draft corresponding to your calculated total displacement, not just the added cargo.