Discussion
Statement I: A directional gyro must be realigned against the magnetic compass at intervals.
Statement II: A gyroscope holds a direction but has no north-seeking property of its own.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both are true and the second explains the first. A gyroscope maintains whatever direction it is set to, but it has no means of finding north - nothing in it is sensitive to the earth's magnetic or rotational field in the way a compass or a north-seeking gyrocompass is.
It therefore starts from a heading given to it and accumulates real and apparent drift thereafter. Realignment against the magnetic compass, conventionally about every fifteen minutes, corrects both.
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