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- Q126 - Navigation Problems: Near Coastal
35. The track line on the chart is 274°T. Variation is 4°E, and deviation is 2°E. The gyro error is 1.5°E. What course would be steered by gyrocompass to make good the desired course?
To determine the gyrocompass course needed to steer a desired true course, subtract the easterly gyro error from the true course: 274T — 1.5E = 272.5pgc. Variation and deviation are irrelevant when calculating gyrocompass courses because gyrocompasses indicate true north.
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