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• Q140 - Navigation Problems: Chart Plot

16. The following questions are based on Chart 12221TR, Chesapeake Bay Entrance, and the supporting publications. Your height of eye is 25 feet (7.6 meters) Gyro error is 3°E Variation is 10°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

On which frequency does the National Weather Service provide 24 hour weather broadcasts to vessels transiting the Chesapeake Bay Bridge Tunnel area?