Page 11 - Electronic Navigation Cyber Book

course due east or west, the ship will display a tilt in the east/west plane
of the gyro and no tilting of the gyro axle occurs - hence no speed error
is produced. The error varies, therefore, with the cosine of the ship's
course. Speed/course gyrocompass error magnitude must also be
affected by latitude and will produce an angle of tilt in the settled gyro.
Hence latitude/course /speed error is sometimes referred to as LCS error.

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