You are underway on course 254°T at a speed of 16.5 knots. You sight a rock bearing 255°T at a radar range of 6.1 miles at 0916. If you change course at 0922, what is the course to steer to leave the rock abeam to starboard at 1.5 miles?

Correct Answer: Option D — 236°T

At 16.5 knots, the vessel travels 1.65 miles in 6 minutes. Using the initial radar range and bearing, calculate the relative motion required to achieve a 1.5-mile CPA to starboard. Plotting the triangle of velocities confirms 236°T is the required heading to clear the rock.