You swung ship and compared the magnetic...

Question 1 of 29218673956e598d45f16831b6e10

You swung ship and compared the magnetic compass against the gyrocompass to find deviation. Gyro error is 2°E. The variation is 8°W. Find the deviation on a magnetic compass heading of 234°.

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Question 1 of 29218

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You swung ship and compared the magnetic compass against the gyrocompass to find deviation. Gyro error is 2°E. The variation is 8°W. Find the deviation on a magnetic compass heading of 234°.

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🔍 Key Concepts

• Relationship between gyro error, variation, and deviation • Standard conversion chain: True – Variation – Magnetic – Deviation – Compass (TVMDC) • Sign convention: which directions (E/W) are added or subtracted at each step

💭 Think About

• Start from the known gyro course and its error to find the true heading, then work step-by-step toward the compass heading • Ask yourself: how does an easterly gyro error change the relationship between gyro heading and true heading? • Once you have True, apply the known variation (8°W) to get Magnetic, then compare that with the given compass heading to solve for deviation

✅ Before You Answer

• Be clear which heading is which: gyro heading, true heading, magnetic heading, compass heading • Use a consistent rule such as: "East is least, West is best" or another TVMDC memory aid and stick to it without flipping signs halfway through • After you compute deviation, check if its direction (E or W) makes sense when you mentally reverse the steps back to True