You are underway on course 340°T at a speed of 14.8 knots. You sight a buoy bearing 342°T at a radar range of 4.8 miles at 1422. If you change course at 1428, what is the true course to steer to leave the buoy abeam to port at 1.0 mile?

Correct Answer: Option D — 001°T

Advance the vessel's position to 1428 using the 14.8-knot speed. Using the relative motion triangle method, determine the course required to achieve a 1.0-mile CPA to port. The vector addition of the vessel's movement relative to the buoy confirms that 001°T is the correct course to steer.