You are on course 251°pgc and 241° per...

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Question 1 of 2066636ee928f7522a1c519482

You are on course 251°pgc and 241° per magnetic compass, when you observe a range in line bearing 192°pgc. The chart indicates that the range is in line on a bearing of 194°T. The variation is 16°E. What is the deviation of the magnetic compass?

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Question 1 of 20

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🔍 Key Concepts

• Compass error = Variation + Deviation (pay attention to algebraic signs E/W) • Relationship between true, gyro, magnetic, and compass bearings • Using the known charted range bearing (true) and the observed compass bearing to find compass error

💭 Think About

• First, convert the charted range bearing (194°T) step-by-step toward what you actually observed on the gyro compass (pgc). Which quantities do you know, and which do you need to solve for? • How do you obtain the total compass error from the difference between the true bearing and the compass (or gyro compass) bearing of the same object? Be careful with the direction of the error (east vs. west). • Once you have the total compass error, how do you separate out the portion that is due to variation to solve for deviation of the magnetic compass?

✅ Before You Answer

• Make sure you keep E and W signs consistent: use one sign convention and stick to it (e.g., "east is plus"). • Confirm you are using the correct pair of bearings when computing magnetic compass deviation (don’t mix gyro and magnetic by accident). • After computing deviation, ask: given the numbers, should the deviation logically be east or west based on how the compass reading compares to the true bearing?

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