Your vessel consumes 236 barrels of fuel per day at a speed of 16.5 knots. What will be the fuel consumption of your vessel at 13.0 knots?

Correct Answer: Option C — 115 bbls

Applying the fuel-speed cubic law, the ratio of fuel consumption is proportional to the cube of the speed ratio (F2 = F1 * (V2/V1)^3). Calculating (13.0/16.5)^3 multiplied by 236 barrels results in approximately 115 barrels. This relationship assumes constant displacement and hull efficiency, standard for USCG navigation and engineering examinations.