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- Q192 - Navigation Problems: Chart Plot
76. The following questions are based on Chart 13205TR, Block Island Sound, and the supporting publications. Your draft is 18 feet (5.5 meters) Your height of eye is 20 feet (6.1 meters) Gyro error is 3°W Variation is 15°W «Per standard magnetic compass» is abbreviated «psc» «Per gyrocompass» is abbreviated «pgc»
DEVIATION TABLE
Magnetic Heading Deviation
000° 1.5°E
030° 2.5°W
060° 2.5°W
090° 2.0°W
120° 1.0°W
150° 0.5°W
180° 0.0°
210° 1.0°E
240° 1.5°E
270° 2.0°E
300° 1.0°E
330° 0.5°W
At 0630, Buoy «PI» is close abeam on the starboard side. You are steering 078°T and are headed directly toward Race Rock Light. At 0654, Little Gull Island Light is bearing 210°pgc and Race Rock Light is bearing 075°pgc. What is your 0654 position?
The correct position is determined by converting gyro compass bearings to true bearings, accounting for gyro error, calculating reciprocal bearings from the lights, and plotting these lines of position on the chart, resulting in a fix at LAT 4114.0'N, LONG 7205.3'W.
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