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- Q135 - Navigation Problems: Oceans
214. On 20 June your vessel's 1955 ZT DR position is LAT 52° 38.9' N, LONG 03° 42.7' E, when an amplitude of the Sun is observed. The Sun's center is on the visible horizon and bears 311° per gyrocompass. Variation in the area is 6° W. At the time of the observation, the helmsman noted that he was heading 352° per gyrocompass and 358° per steering compass. What is the gyro error and deviation for that heading?
The Sun's true bearing (312.3T) exceeds the gyro bearing (311G), indicating a 1.3E gyro error. This same correction applies to the compass, resulting in a 1.3E deviation on a heading of 358C.
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