You are underway on course 163°T at a speed of 15.8 knots. You sight a buoy bearing 161°T at a radar range of 5.5 miles at 1319. If you change course at 1325, what is the course to steer to leave the buoy abeam to starboard at 1.0 mile?

Correct Answer: Option B — 145°T

Calculate distance traveled between 1319 and 1325 (6 minutes at 15.8 knots = 1.58 miles). Plot the initial position and the target abeam position. Using the relative motion triangle, the course change required to pass the buoy at 1.0 mile to starboard is 145T.