The true course between two points is 023°T. Your gyrocompass has an error of 1°W and you make an allowance of 4° leeway for an east wind. What gyro course should be steered to make the true course good?
Official USCG Answer & Rule Citation
Correct Answer: Option B — 028°pgc
An east wind pushes the vessel west, requiring a 4-degree correction to the right (023+4=027T). Applying 1-degree West gyro error (adding error to True to get PGC), 027+1 equals 028 degrees PGC. This compensates for both environmental drift and instrument error.
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