You are steaming on a course of 246°T at 17...

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Question 1 of 2066636ee928f7522a1c51a19e

You are steaming on a course of 246°T at 17 knots. At 2107 you observe a lighthouse bearing 207°T. At 2119 the lighthouse bears 179°T. What is your distance off at the second bearing?

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Question 1 of 20

66636ee928f7522a1c51a19e

You are steaming on a course of 246°T at 17 knots. At 2107 you observe a lighthouse bearing 207°T. At 2119 the lighthouse bears 179°T. What is your distance off at the second bearing?

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🔍 Key Concepts

• Use the concept of a running fix with two bearings and known course and speed. • Convert the time difference between bearings to distance run using speed-distance-time. • Apply the distance off by double the angle on the bow idea (or similar triangle relationships) when the bearing passes nearly ahead or abaft the beam.

💭 Think About

• How far did you travel between 2107 and 2119 at 17 knots, in nautical miles? • If you draw your course line and plot the two bearings from the lighthouse, what geometric relationship forms between the lighthouse, your two positions, and your track? • How can you use the change in relative bearing to relate the distance run along track to your perpendicular distance off at the second bearing?

✅ Before You Answer

• Convert 12 minutes of time into hours correctly before using the speed formula. • Be sure to draw or imagine the bearings from the lighthouse to your track, not from your vessel to the light, and keep the angles consistent. • Verify that the final distance off is perpendicular from your 246°T track to the lighthouse at the time of the second bearing (179°T).

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Question 1 of 2066636ee928f7522a1c51a19e

You are steaming on a course of 246°T at 17 knots. At 2107 you observe a lighthouse bearing 207°T. At 2119 the lighthouse bears 179°T. What is your distance off at the second bearing?

Back

Question 1 of 20

66636ee928f7522a1c51a19e

You are steaming on a course of 246°T at 17 knots. At 2107 you observe a lighthouse bearing 207°T. At 2119 the lighthouse bears 179°T. What is your distance off at the second bearing?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed