You are underway on course 315°T at 14 knots. The current is 135°T at 1.9 knots. What is the speed being made good?

Correct Answer: Option A — 12.1 knots

When the current is directly opposing the vessel's course (180-degree difference), the speed made good is simply the engine speed minus the drift. Here, 14 knots minus 1.9 knots equals 12.1 knots. This is a fundamental application of vector subtraction in current sailing as described in Bowditch.