At 2232 ZT on 14 July you are in DR position LAT 33°52'S, LONG 150°03'W, when you observe an amplitude of Jupiter. The planet is about one Sun's diameter above the visible horizon and bears 268.5°pgc. The variation is 15°E. What is the gyro error?

Question

At 2232 ZT on 14 July you are in DR position LAT 33&deg;52'S, LONG 150&deg;03'W, when you observe an amplitude of Jupiter. The planet is about one Sun's diameter above the visible horizon and bears 268.5&deg;pgc. The variation is 15&deg;E. What is the gyro error?

Accepted Answer

Option A: 1.0&deg;E. Calculate the celestial body's true azimuth via standard amplitude formulas using latitude and the body's declination obtained from the Nautical Almanac. Compare the computed true azimuth with the gyro compass bearing, applying variation and algebraic differences to find the gyro error.

At 2232 ZT on 14 July you are in DR position LAT 33&deg;52'S, LONG 150&deg;03'W, when you observe an amplitude of Jupiter. The planet is about one Sun's diameter above the visible horizon and bears 268.5&deg;pgc. The variation is 15&deg;E. What is the gyro error?

At 2232 ZT on 14 July you are in DR position LAT 33°52'S, LONG 150°03'W, when you observe an amplitude of Jupiter. The planet is about one Sun's diameter above the visible horizon and bears 268.5°pgc. The variation is 15°E. What is the gyro error?