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- Q140 - Navigation Problems: Chart Plot
46. The following questions should be answered using Chart 12354TR, Long Island Sound — Eastern Part, and the supporting publications. Your vessel has a draft of 10 feet (3.1 meters) Your height of eye is 35 feet (10.6 meters) Gyro error is 2°E Variation is 14°W «Per standard magnetic compass» is abbreviated «psc» «Per gyrocompass» is abbreviated «pgc»
DEVIATION TABLE
Magnetic Heading Deviation
000° 0°
030° 1°W
060° 2°W
090° 4°W
120° 2°W
150° 1°W
180° 1°E
210° 2°E
240° 3°E
270° 3°E
300° 2°E
330° 1°E
At 0345 you set a course to depart New London Harbor. Assuming no set and drift, which course psc must you steer to stay in the middle of the channel?
To maintain the charted mid-channel course of 174T, you must account for variation and deviation. Applying 14W variation and the appropriate deviation results in a course of 187psc.
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