The DEEP DRILLER departs a fresh water port at a draft of 20 feet. What will be the draft in sea water?
Official USCG Answer & Rule Citation
Correct Answer: Option C — 19.6 feet
Vessel draft changes proportionally with water density based on Archimedes' Principle. Using the fresh water allowance formula, transition from fresh water (1.000 density) to sea water (1.026 density) reduces the displacement draft from 20.0 feet to approximately 19.6 feet.
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