You are on course 244° per standard magnetic...

Question 1 / 2066636eea28f7522a1c51afe2

Question 1 of 2066636eea28f7522a1c51afe2

You are on course 244° per standard magnetic compass when you sight Block Island Southeast Point Light in line with Block Island Aero Beacon bearing 326° per standard magnetic compass. Based on this information which of the following should you do?

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🔍 Key Concepts

• Compass error vs. variation vs. deviation • Use of charted ranges (two charted objects in line) to check compass performance • How a deviation table is constructed for specific headings

💭 Think About

• What does it mean when two charted fixed aids (light and aero beacon) visually appear exactly in line? How should their true bearing compare to your compass bearing if there were no errors? • If your vessel’s heading is 244° per standard magnetic compass, what does your deviation table tell you about errors on that heading, and how would you use a known range bearing to confirm or question that? • Under what circumstances would you suspect local magnetic disturbance instead of ordinary deviation or variation?

✅ Before You Answer

• Verify the true range bearing (from chart) between Block Island Southeast Point Light and Block Island Aero Beacon and compare it to the compass bearing observed (326°psc). • Check what the deviation table would predict for the ship’s head 244° and whether the observed alignment agrees with that prediction. • Confirm whether a single discrepancy on one heading with fixed, charted objects is enough to conclude local magnetic disturbance, or if it more likely indicates a normal compass error (variation + deviation).

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Question 1 of 20

know the compass error is 12°W

swing your vessel to check the deviation table

apply 3°W deviation to any bearing (psc) while on a heading of 244°psc

suspect that there is a local magnetic disturbance

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Question 1 / 2066636eea28f7522a1c51afe2

Question 1 of 2066636eea28f7522a1c51afe2

Back

Question 1 of 20

66636eea28f7522a1c51afe2

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