🔍 Key Concepts

• Sounding tables/tank capacity tables for fuel oil tank 4P on the DEEP DRILLER • How to obtain weight of fuel from a sounding (feet) before finding a moment • Relationship: Longitudinal moment = Weight × Longitudinal distance (with sign for port/starboard or fore/aft)

💭 Think About

• Start by asking: from 8.75 ft of sounding, what is the corresponding weight of fuel in that tank according to the tank calibration data? • Once you have the weight, where is this tank located longitudinally relative to the chosen reference point (usually amidships or FP)? Is it forward or aft, and how far? • Think about the sign convention used on this vessel’s stability data: when is the longitudinal moment taken as negative, and when is it positive?

✅ Before You Answer

• Verify the weight (long tons) corresponding to 8.75 ft from the actual sounding/capacity table for fuel oil tank 4P – do not try to compute it just from the depth alone • Confirm the longitudinal lever arm (feet) used in the trim/stability book for tank 4P and whether it is forward or aft of the reference • Check the exam’s usual convention: moments aft of the reference might be positive and moments forward might be negative (or vice versa) – be sure which convention the DEEP DRILLER data uses before choosing among positive and negative answers