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 A — 279°T

Convert the gyro course to true by applying the gyro error. A 2-degree West error means the gyro reads higher than true. Subtracting the 2-degree error from the 281 PGC yields 279 True. Variation and deviation are irrelevant here as the vessel is already navigating via gyrocompass, and no leeway is mentioned.