At 2234 ZT on 14 July you are in DR position LAT 34°03' N, LONG 150°16' W, when you observe an amplitude of Saturn. The planet is about one Sun's diameter above the visible horizon and bears 272.1°pgc. The variation is 14°E. What is the gyro error?

Correct Answer: Option C — 1.5°W

Amplitude calculations determine the true bearing of a celestial body at the horizon. By comparing the true amplitude (calculated using declination and latitude) with the gyro bearing (272.1°pgc) and applying variation, the gyro error is derived. The difference confirms a gyro error of 1.5°W.