At 1423 you are on course 072°T at 12.2...

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Question 1 of 2066636ee928f7522a1c51908f

At 1423 you are on course 072°T at 12.2 knots, when you sight a rock awash bearing 070°T at a range of 3.6 miles. If you change course at 1427, what course would you steer to leave the rock 1.0 mile abeam to port?

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Question 1 of 20

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🔍 Key Concepts

• Relative motion between own ship and the rock when on course 072°T at 12.2 knots • How far you travel between 1423 and 1427, and how that changes your position relative to the rock • How to construct or visualize a line 1.0 mile abeam (perpendicular offset) from the rock to port side

💭 Think About

• First, determine your ship’s position at 1427 using your original course and speed, and the initial bearing and range of the rock at 1423 • On a plotting sheet or sketch, mark the rock’s position, then your position at 1427, and draw the line of your new course that passes so the rock lies 1.0 mile on your port beam (90° off your new course) • Compare the resulting course line with the multiple-choice options and see which course gives a closest point of approach of 1.0 mile to port

✅ Before You Answer

• Verify the distance run in 4 minutes at 12.2 knots using the speed formula • Make sure the rock’s bearing and range are plotted correctly from the 1423 position before advancing your own-ship position • Confirm that the rock ends up exactly 1.0 NM abeam to port (90° to the left of your new heading) at the closest point of approach

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