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- Q140 - Navigation Problems: Chart Plot
61. The following questions should be answered using Chart 12354TR, Long Island Sound — Eastern Part, and the supporting publications. Your vessel has a draft of 9 feet (2.7 meters). Your height of eye is 25 feet (7.6 meters). Variation is 14°W «Per standard magnetic compass» is abbreviated «psc» «Per gyrocompass» is abbreviated «pgc»
DEVIATION TABLE
Magnetic Heading Deviation
000° 0.0°
030° 1.0°W
060° 3.0°W
090° 2.0°W
120° 1.0°W
150° 0.0°
180° 0.0°
210° 1.0°E
240° 2.0°E
270° 1.5°E
300° 1.0°E
330° 0.0°
You are turning for 7.5 knots. As you enter the New Haven Outer Channel, you sight the range markers in line directly over the stern. Your heading at the time is 155.5°pgc. What is the gyro error?
The gyro error is determined by comparing the true heading, derived from the range line, to the gyro heading. The true heading is 153.5T, while the gyro heading is 155.5pgc, resulting in a 2.0W gyro error. This is because the gyro reading is higher than the true heading, indicating a westward error, as confirmed by the rule 'gyro best, error west'.
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