Deck General USCG Question #4571 (Set 146)

The COASTAL DRILLER has a trim of 2.13 feet by the stern. The draft at the forward draft marks is observed to be 8.0 feet. The draft at the center of flotation is __________.

Official USCG Answer & Rule Citation

Correct Answer: Option D — 9.42 feet

Hydrostatic calculations for the jack-up COASTAL DRILLER apply longitudinal trim interpolation between forward and aft perpendiculars. Using the vessel's specific Center of Flotation (LCF) distance, draft at the LCF equals the forward draft plus the trim adjustment proportioned to the LCF location, resulting in 9.42 feet.

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