You swung ship and compared the magnetic...

Question 1 of 2921866636ee928f7522a1c51a224

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 057°. Deviation table NP-0109

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Question 1 of 29218

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🔍 Key Concepts

• Relationship between True, Gyro, Magnetic, and Compass headings (TGMC ladder) • How variation (W/E) and deviation (W/E) combine to create compass error • Meaning of a gyro error 2°E and how that affects the conversion between true and gyro headings

💭 Think About

• Start by writing the full sequence: True ↔ Gyro ↔ Magnetic ↔ Compass, and note where variation and deviation are applied • Think about whether an E error (gyro reads east) means the gyro is higher or lower than the true heading, and how that changes the sign when you move between True and Gyro • Once you find the true heading corresponding to the compass heading, compare it to what the gyro reads to back out the deviation

✅ Before You Answer

• Be very clear on the sign convention: does West variation get added or subtracted when going from true to magnetic? • Carefully interpret "gyro error 2°E" – is the gyro reading 2° greater or 2° less than the true heading? • After you compute deviation, check if the sense (E or W) matches what you would expect from the combined effects of variation and the observed difference between gyro and compass