Which of the gyrocompass definitions is the most correct?

Question

Accepted Answer

Gyrocompass is electrical and mechanical display of true (geographic) meridian direction designed to determine ship's course and bearing

Answer

There is no correct answer

Answer

Gyrocompass is electrical and mechanical display of magnetic meridian designed to determine ship's course and bearing

Answer

Gyrocompass is electrical and mechanical display that uses electromagnetic waves to  determine ship's course and bearing

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