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- Apprentice Mate Steersman (Oceans or Near Coastal (Any Appropriate Tonnage)) »
- Q415 - Navigation Problems: Near Coastal
16. Your vessel is proceeding up a channel steering on a pair of range lights that are in line ahead. The chart indicates that the direction of this pair of lights is 249°T, and the variation is 14°E. If the heading of your vessel at the time of the sighting is 226° per standard magnetic compass, what is the correct deviation?
The deviation is 9E because the compass heading must be increased by 9 to match the magnetic heading required for the range line. The true heading (249T) equals the charted true bearing, and accounting for variation (14E) and the compass heading (226) using the formula T = C + D + V results in a deviation of 9E.
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