At 2043 ZT on 13 October you are in DR position LAT 43°57.3'S, LONG 147°16.0'E, when you observe an amplitude of Venus. The planet is about one Sun's diameter above the horizon and bears 236.2°pgc. The variation is 15°E. What is the gyro error?

Question

At 2043 ZT on 13 October you are in DR position LAT 43&deg;57.3'S, LONG 147&deg;16.0'E, when you observe an amplitude of Venus. The planet is about one Sun's diameter above the horizon and bears 236.2&deg;pgc. The variation is 15&deg;E. What is the gyro error?

Accepted Answer

Option A: 0.0&deg;. Calculate Venus's true amplitude utilizing standard navigational formulas involving DR latitude and ephemeris declination. Compare the resulting true bearing directly with the gyro compass bearing to determine the existing gyro error magnitude.

At 2043 ZT on 13 October you are in DR position LAT 43&deg;57.3'S, LONG 147&deg;16.0'E, when you observe an amplitude of Venus. The planet is about one Sun's diameter above the horizon and bears 236.2&deg;pgc. The variation is 15&deg;E. What is the gyro error?

At 2043 ZT on 13 October you are in DR position LAT 43°57.3'S, LONG 147°16.0'E, when you observe an amplitude of Venus. The planet is about one Sun's diameter above the horizon and bears 236.2°pgc. The variation is 15°E. What is the gyro error?