Navigation Problems USCG Question #1430 (Set 42)

The true course between two points is 106°. Your gyrocompass has an error of 2°E and you make an allowance of 2° leeway for a south wind. What gyro course should be steered to make the true course good?

Official USCG Answer & Rule Citation

Correct Answer: Option A — 106°pgc

A south wind pushes the vessel north, requiring a 2-degree correction to the south (106-2=104T). Applying 2-degree East gyro error (subtracting error from True to get PGC), 104-2 equals 102 degrees PGC. Wait, the correct logic is 106T, 2E error = 104PGC. Correction for leeway is 106T.

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