Gyrocompass difference refers to the error caused by bai technical problems in gyrocompass, and du is often affected by latitude zhi degree and speed, but it has little change.The dao compass was measured by the manufacturer before it left the factory.
The compass difference is usually referred to as the magnetic compass difference. It has two parts: the magnetic difference and the deviation.
Magnetic difference refers to the Angle at which a magnetic compass deviates from the true north under the influence of geomagnetic field, while deviation refers to the Angle at which a magnetic compass on a steel ship deviates from the true north under the influence of the ship's magnetic field.
The magnetic compass difference is the sum of the magnetic difference and the deviation.
Of course, from a theoretical point of view, the compass error includes both gyro-compass error and magnetic compass error
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