Navigation Problems USCG Question #1428 (Set 42)

The true course between two points is 337°. Your gyrocompass has an error of 3°E and you make an allowance of 5° leeway for a west wind. Which gyro course should be steered to make the true course good?

Official USCG Answer & Rule Citation

Correct Answer: Option C — 329°pgc

Leeway is the drift caused by wind, pushing the vessel downwind. A west wind pushes the vessel east, requiring a 5-degree correction to the left (337-5=332T). Applying 3-degree East gyro error (subtracting error from True to get PGC), 332-3 equals 329 degrees PGC.

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