You swung ship and compared the magnetic...

Question 1 of 2921866636eea28f7522a1c51b677

You swung ship and compared the magnetic compass against the gyrocompass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a true heading of 319°.

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Question 1 of 29218

You swung ship and compared the magnetic compass against the gyrocompass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a true heading of 319°.

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🔍 Key Concepts

• Compass error relationship: True – Variation = Magnetic; Magnetic – Deviation = Compass (use TVMDC or similar memory aid) • How gyro error (true vs gyro) fits into the chain from True to Compass • Signs (East/West) and whether you add or subtract each correction

💭 Think About

• Start from the true heading (319°T) and work step-by-step toward what the compass would read, using variation, deviation, and gyro error as needed. • Work out what the gyro heading would be on 319°T with a 2°W gyro error. Then relate that to the magnetic compass heading you actually observed when swinging ship. • Carefully track whether you are solving for deviation on that heading or just repeating compass error. Are you mixing up deviation with variation or gyro error?

✅ Before You Answer

• Be clear on the sign convention: West is usually added when going from True to Magnetic, and East is subtracted (depending on your memory aid like “True Virgins Make Dull Companions”). • Confirm that you are using gyro error correctly: is 2°W gyro reading higher or lower than true? • Before picking an answer, check whether your final deviation sign (E or W) makes sense with the relative positions of true, magnetic, and compass headings.