On 27 June your 1905 ZT DR position is LAT 24°35.0'N, LONG 50°15.0'W. At that time, you observe Saturn bearing 211°pgc. The chronometer reads 10h 04m 26s and the chronometer error is 01m 20s slow. The variation is 4.5°E. What is the gyro error?

Question

On 27 June your 1905 ZT DR position is LAT 24&deg;35.0'N, LONG 50&deg;15.0'W. At that time, you observe Saturn bearing 211&deg;pgc. The chronometer reads 10h 04m 26s and the chronometer error is 01m 20s slow. The variation is 4.5&deg;E. What is the gyro error?

Accepted Answer

Option A: 1.1&deg;W. Calculate the LHA of Saturn using the chronometer time and GHA. Determine the Zn (True Azimuth) using the ABC tables. The difference between the Zn and the observed bearing (pgc) provides the gyro error. Applying the variation of 4.5°E results in a gyro error of 1.1°W.

On 27 June your 1905 ZT DR position is LAT 24&deg;35.0'N, LONG 50&deg;15.0'W. At that time, you observe Saturn bearing 211&deg;pgc. The chronometer reads 10h 04m 26s and the chronometer error is 01m 20s slow. The variation is 4.5&deg;E. What is the gyro error?

On 27 June your 1905 ZT DR position is LAT 24°35.0'N, LONG 50°15.0'W. At that time, you observe Saturn bearing 211°pgc. The chronometer reads 10h 04m 26s and the chronometer error is 01m 20s slow. The variation is 4.5°E. What is the gyro error?