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- Apprentice Mate Steersman (Western Rivers (Any Appropriate Tonnage)) »
- Q425 - Navigation General: Western Rivers
38. To find a magnetic compass course from a true course what must you apply?
To determine a magnetic compass course from a true course, both variation and deviation must be applied. Variation accounts for the difference between true north and magnetic north, while deviation corrects for errors caused by the vessel's magnetic field. Applying only one correction is insufficient to accurately convert a true course to a compass course.
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