You swung ship and compared the magnetic...

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Question 1 of 2066636ee928f7522a1c51a222

You swung ship and compared the magnetic compass against the gyro compass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a gyro heading of 039°.

PSC PGC 030.5° 024° 061.5° 054° 092.0° 084° 122.5° 114° 152.0° 144° 181.0° 174° 210.0° 204° 239.5° 234° 269.0° 264° 298.0° 294° 327.5° 324° 358.5° 354°

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Question 1 of 20

66636ee928f7522a1c51a222

You swung ship and compared the magnetic compass against the gyro compass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a gyro heading of 039°.

PSC PGC 030.5° 024° 061.5° 054° 092.0° 084° 122.5° 114° 152.0° 144° 181.0° 174° 210.0° 204° 239.5° 234° 269.0° 264° 298.0° 294° 327.5° 324° 358.5° 354°

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🔍 Key Concepts

• Gyro error relationship: ( \text{G} - \text{T} = \text{Gyro Error} ) (west is minus, east is plus) • The classic compass conversion sequence: ( \text{True – Variation – Deviation = Compass} ) and how to adapt that when using gyro instead of true • How to use the swing table (PSC vs PGC) to interpolate the magnetic heading that corresponds to a gyro heading of 039°

💭 Think About

• First, convert the gyro heading of 039° to an approximate true heading using the known gyro error. Is the true heading larger or smaller than the gyro heading when the gyro error is west? • From that true heading, use the known variation of 8°W to find the magnetic heading. Again, decide whether you add or subtract west variation when going from true to magnetic. • Use the PSC–PGC table to see what the standard/magnetic compass should read at that magnetic heading, and then compare that expected magnetic heading with the actual one implied by your conversions to decide the sign and size of the deviation.

✅ Before You Answer

• Be consistent with the direction signs: West errors are subtracted, East errors are added when moving toward true north. • Confirm that you are clear on what PSC (per standard compass) represents (magnetic) versus PGC (per gyro compass) so you don’t mix them up. • After you get a candidate deviation value, quickly test it in the full chain: Gyro → True (using gyro error) → Magnetic (using variation) → Compass (using deviation) and see if the numbers flow logically.

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Question 1 of 2066636ee928f7522a1c51a222

You swung ship and compared the magnetic compass against the gyro compass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a gyro heading of 039°.

PSC PGC 030.5° 024° 061.5° 054° 092.0° 084° 122.5° 114° 152.0° 144° 181.0° 174° 210.0° 204° 239.5° 234° 269.0° 264° 298.0° 294° 327.5° 324° 358.5° 354°

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Question 1 of 20

66636ee928f7522a1c51a222

You swung ship and compared the magnetic compass against the gyro compass to find deviation. Gyro error is 2°W. The variation is 8°W. Find the deviation on a gyro heading of 039°.

PSC PGC 030.5° 024° 061.5° 054° 092.0° 084° 122.5° 114° 152.0° 144° 181.0° 174° 210.0° 204° 239.5° 234° 269.0° 264° 298.0° 294° 327.5° 324° 358.5° 354°

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed