You are underway on course 017°T at a speed...

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Question 1 of 2066636ee928f7522a1c51a4c3

You are underway on course 017°T at a speed of 14.2 knots. You sight a buoy bearing 025°T at a radar range of 3.7 miles at 1947. If you change course at 1953, what is the course to steer to leave the buoy abeam to starboard at 0.1 mile?

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Question 1 of 20

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🔍 Key Concepts

• Relative motion and abeam position – what does it mean to leave a buoy abeam to starboard at a specific distance? • Plotting initial and final positions – using the original course and speed to find where you will be at 1953 before changing course. • Course alteration geometry – how to find the new course that will place the buoy 0.1 mile off your starboard beam.

💭 Think About

• From 1947 to 1953, how far do you travel on course 017°T at 14.2 knots? Plot that run and your new position on the chart or plotting sheet. • From your 1953 position, what line represents the locus of points where the buoy will be exactly 0.1 mile off your starboard beam? How does that relate to your new course line? • If the buoy is to be abeam to starboard, what is the relative bearing from your ship to the buoy at the closest point, and how should your course line pass with respect to the buoy’s fixed position?

✅ Before You Answer

• Compute the distance run between 1947 and 1953 using ( \text{Distance} = \frac{\text{Speed} \times \text{Time (min)}}{60} ). • Verify the geometry of abeam to starboard: the buoy should lie on a line perpendicular to your new course, 0.1 mile to starboard. • Check that the chosen answer produces a course line that passes the buoy at the correct closest point of approach (CPA) of 0.1 mile to starboard, not ahead or astern.

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