172. 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?

The gyro error is calculated by subtracting the true bearing from the gyro bearing. The true bearing of Saturn, derived from the amplitude, is approximately 270.6T, while the observed gyro bearing is 272.1G. Therefore, the gyro error is 270.6 — 272.1 = -1.5, indicating an error of 1.5 West.