Instrumentationhard#416
Apparent drift of a directional gyro is caused by:
A
Mechanical friction
B
Acceleration errors
C
Magnetic interference
D
Earth's rotation — the gyro maintains its orientation in space while the Earth rotates beneath it
CorrectExplanation
A free gyro maintains its orientation in inertial space; the Earth's rotation causes an apparent drift of 15°/hr × sin(latitude).
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