You are underway on course 163°T at a speed...

Question 1 of 31048fy_heal_CREATE_q371_2027

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?

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Question 1 of 31048

🔍 Key Concepts

• Relative motion of your vessel and the buoy between 1319 and 1325 • Using a right triangle or vector diagram to find closest point of approach (CPA) to the buoy • Relationship between desired abeam distance (1.0 mile) and the new course line past the buoy

💭 Think About

• From 1319 to 1325, how far do you travel at 15.8 knots, and in what direction relative to the buoy? • After the course change at 1325, what track direction will make the buoy pass abeam to starboard at exactly 1.0 mile? Think of a line parallel to your new course offset by 1 mile through the buoy. • Which answer choices give a reasonable change of course from 163°T, considering the buoy is slightly on your starboard bow (161°T) and you want it to pass abeam to starboard later?

✅ Before You Answer

• Convert the time interval (1319 to 1325) into hours correctly before using $\text{Speed} = \frac{\text{Distance}}{\text{Time}}$ . • Plot or sketch both the original track and the buoy’s relative position at 1319, then your new position at 1325 before drawing the new course line. • Ensure the new course crosses the line that is 1.0 mile from the buoy on the starboard side so that the buoy will be abeam at that distance, not ahead or astern.