While proceeding up a channel on course 010°...

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Question 1 of 2066636eea28f7522a1c51b4f2

While proceeding up a channel on course 010° per gyrocompass, you notice a pair of range lights in alignment with the masts of your vessel when viewed forward. A check of the chart shows the range to be 009°T and the variation to be 15°W. If the ship's course is 026°psc, what is the deviation for the present heading?

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Question 1 of 20

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🔍 Key Concepts

• Gyro vs. true vs. compass courses and how to convert between them • Relationship between variation, deviation, and compass error • How a range line bearing tells you your actual true course when you are lined up on the range

💭 Think About

• When your vessel is exactly on a charted range line, what must your true course be compared to the charted range bearing? • You are given a gyro course and a compass course. How can you compare them through true north to find the total compass error? • Once you have total compass error, how do you separate it into variation + deviation to solve for deviation?

✅ Before You Answer

• Confirm how to apply east/west rules: "East is least, west is best" when converting between true and compass • Check that you are using the correct algebraic sign for variation (15°W) in the equation: True = Compass ± Variation ± Deviation • Verify that you use the range line bearing (009°T), not the gyro course, to establish your actual true heading at that moment

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