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Gyro compassing determines heading by

  • A.Comparing two accelerometers
  • B.Using satellite positioning
  • C.Sensing the earth's rotation rate
  • D.Measuring the earth's magnetic field

Answer: C

Only very low noise gyros can resolve a rate of 15 degrees an hour reliably, which is why the technique belongs to inertial grade systems. It gives true rather than magnetic heading and needs no magnetic sensor at all.

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