You wish to make good a course of 053°T while turning for an engine speed of 16 knots. The set is 345°T, and the drift is 2.4 knots. What speed will you make good along the track line?

Correct Answer: Option B — 16.8 knots

Using a maneuvering board or vector analysis, the engine speed of 16 knots is combined with the current of 2.4 knots at 345°. The resultant vector along the desired track of 053° yields a speed made good of 16.8 knots, following the principles of relative motion in navigation.