While enroute from Cape Town to Rio a vessel's course is 281°pgc. The variation for the locality is 24°W. The deviation is 4°E. The gyro error is 2°W. What is the true course made good?

Correct Answer: Option B — 279°T

Converting gyrocompass course (pgc) to true course requires applying gyro error, where easterly error is added and westerly error is subtracted. Variation and deviation are already accounted for within the established gyro error value.