You desire to make good a true course of 157°. The variation is 15°E, magnetic compass deviation is 9°W, and gyrocompass error is 3°E. A southwesterly wind produces a 2° leeway. What is the course to steer per standard magnetic compass to make the true course good?

Correct Answer: Option D — 153°psc

True 157° + Leeway 2° (wind from southwest) = 159°. 159° - Variation 15°E = 144° Magnetic. 144° + Deviation 9°W = 153°psc. Gyro error is irrelevant when calculating a magnetic compass course. Always isolate the necessary variables to avoid errors in the conversion process.