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- Q125 - Navigation Problems: Chart Plot
12. The following questions are to be answered using Chart 12221 TR, Chesapeake Bay Entrance, and supporting publications. You are on an oceanographic research vessel equipped with standard navigational equipment. The gyro error is 2°W. The maximum draft is 13 feet. Use 10°W variation where required.
DEVIATION TABLE
Magnetic Heading Deviation
060° 1°W
075° 0°
090° 1°E
Chesapeake Channel is temporarily closed to traffic. At 2215 you anchor on the following bearings:
Wolf Trap Light: 358°pgc
Light «HH»: 301°pgc
New Point Comfort Spit Light «2»: 263°pgc
What is your 2215 position?
Convert gyro bearings to true bearings using the gyro error, determine reciprocal bearings, and plot the lines of position on the chart; the intersection of these lines indicates your position at LAT 3718.3'N, LONG 7610.9'W.
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