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- Master (Oceans or Near Coastal (Uninspected Fishing Industry Vessel)) »
- Q182 - Navigation General: Near Coastal
247. What is the difference between magnetic heading and compass heading called?
Deviation is the angular difference between magnetic heading and compass heading, resulting from magnetic influences aboard the vessel. Variation is the difference between true north and magnetic north, while compass error represents the total difference between compass heading and true heading, encompassing both variation and deviation.
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