Your vessel is proceeding up a channel, and...

Question 1 / 2066636eea28f7522a1c51b7e0

Question 1 of 2066636eea28f7522a1c51b7e0

Your vessel is proceeding up a channel, and you see a pair of range lights that are in line ahead. The chart indicates that the direction of this pair of lights is 186° T, and the variation is 11° W. If the heading of your vessel at the time of the sighting is 193° per standard magnetic compass, what is the correct deviation?

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🔍 Key Concepts

• Compass error = Difference between a true direction and what your compass shows • Relationship between variation, deviation, and compass error** • Converting between true, magnetic, and compass headings using the correct algebraic signs (East/West)

💭 Think About

• Start from the charted range bearing (given in TRUE) and combine it with the local variation to find what the MAGNETIC bearing of the range should be • Compare that expected magnetic bearing with what your ship’s COMPASS is actually steering to find the total compass error • Use the rule "Compass error = Variation + Deviation" (with proper signs) to solve for deviation, then decide if it is East or West

✅ Before You Answer

• Be sure you are clear on whether variation 11° W is added or subtracted when going from TRUE to MAGNETIC • Check whether a compass that reads higher or lower than the magnetic bearing indicates East or West deviation • Before choosing an answer, verify that your final deviation sign (E or W) is consistent with both the numeric difference and the rule Error East, Magnetic least; Error West, Magnetic best

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Question 1 of 20

4° E

4° W

7° E

7° W

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Question 1 / 2066636eea28f7522a1c51b7e0

Question 1 of 2066636eea28f7522a1c51b7e0

Back

Question 1 of 20

66636eea28f7522a1c51b7e0

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?

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