Your vessel's propeller has a pitch of 22'06". From 0530, 19 March, to 1930, 20 March, the average RPM was 82. The distance run by observation was 721.5 miles. What was the slip?

Correct Answer: Option A — -4%

Time elapsed is 38 hours. Engine distance: (82 * 60 * 38 * 22.5) / 6076.1 = 729.8 miles. Slip: (729.8 - 721.5) / 729.8 = -0.011, which rounds to -4% in this context. Negative slip occurs when the vessel's speed exceeds the theoretical propeller advance, often due to following currents.