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- Master & Chief Mate (Oceans or Near Coastal (Unlimited Tonnage)) »
- Q108 - Navigation Problems: Near Coastal
53. Your vessel is proceeding up a channel, and you see a pair of range lights that are in line dead ahead. The chart indicates that the direction of this pair of lights is 283°T, and the variation is 13°E. If the heading of your vessel at the time of the sighting is 278° per standard compass, what is the deviation?
The deviation is 8W. The true heading (283T) is converted to magnetic heading by subtracting the variation (13E), resulting in 270M. The deviation is then calculated as the difference between the magnetic heading (270M) and the compass heading (278C), which is -8, indicating a west deviation.
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