Discussion
Statement I: Apparent drift is not a real movement of the gyro's spin axis.
Statement II: It arises because the observer's reference frame rotates beneath a space-fixed axis.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Both are true and the second is the mechanism. The spin axis holds its direction in inertial space; what moves is the earth beneath it, and the aircraft over the earth.
An observer using local north as a reference therefore sees the axis appear to wander, though no torque has acted on it. The distinction matters practically: apparent drift is predictable from latitude and track and can be compensated by design, whereas real drift is random and can only be removed by realignment.
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