Entering a harbor, you take a bearing on a range and get 338° per gyrocompass (pgc). The true bearing from the chart is 340°T. Variation for the area is 14°E. Your course is 329° per standard magnetic compass (psc) and 338°pgc. The deviation on this heading is __________.

Correct Answer: Option B — 3°W

True bearing of 340°T and variation of 14°E establish the magnetic heading. Comparing the true bearing to the gyro bearing provides gyro error. Applying magnetic, true, and standard compass relationships isolates the deviation as 3°W per Bowditch navigation standards.