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- Q125 - Navigation Problems: Chart Plot
49. After departing the New Haven terminals, your 1800 position puts the New Haven Harbor Lighted Whistle Buoy «NH» bearing 130°T at a range of 0.2 mile. From this position you set a course to leave Stratford Shoal Middle Ground Light 1.0 mile off your starboard beam. Your speed is 12.5 knots. At 1845 you determine your position to be LAT 41°05.5'N, LONG 73°03.1'W. What were the set and drift of the current?
The offset between the calculated and actual position reveals the current's effect. Plotting this offset vector, which spans 0.6 NM over 45 minutes, indicates a current set of 294T at a drift of 0.8 knots.
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