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- Q140 - Navigation Problems: Chart Plot
110. At 0728, Race Rock Light is bearing 282°T at 3.8 miles, and the closest point on Fishers Island has a radar range of 2.1 miles. What speed have you been making since you changed course at 0705?
The speed made good is determined by dividing the distance run between 0705 and 0728, measured on the chart, by the elapsed time of 23 minutes. This calculation yields a speed of approximately 9.6 knots.
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