You are underway on course 160°T at 10 knots. The current is 210°T at 0.9 knots. What is the speed being made good?

Correct Answer: Option C — 10.7 knots

Vector resolution of the ship's course (160°) and the current (210°) at 0.9 knots shows a favorable component along the track. Calculating the resultant vector using the law of cosines confirms the speed made good increases to 10.7 knots, adhering to standard navigational vector addition procedures.