You swung ship and compared the magnetic...

Question 1 of 2921866636eea28f7522a1c51b673

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 magnetic compass heading of 004°.

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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 magnetic compass heading of 004°.

🔍 Key Concepts

• Gyro error (GE) vs compass error (CE) and how they relate • Order of converting between True–Variation–Magnetic–Deviation–Compass (TVMDC) • Sign convention: what does West error (W) do to a reading?

💭 Think About

• Start from what the gyrocompass is supposed to read if there were no error, then apply the given gyro error to find the true heading involved in this comparison. • Once you know the true heading, use the given variation to find the corresponding magnetic heading before deviation. • Compare that magnetic heading with the magnetic compass heading 004° to work out how much deviation must be present, and in which direction.

✅ Before You Answer

• Be clear whether 2°W gyro error means gyro is reading too high or too low, and which way you correct it to get True. • Use the correct TVMDC sequence and keep all angles in the same direction (0°–360°) when adding/subtracting. • Check at the end whether your computed deviation sign (E or W) is consistent with the fact that Variation is 8°W and your two headings (gyro vs magnetic) are relatively close together.