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- Q107 - Navigation Problems: Chart Plot
23. At 0800 you reduce speed from sea speed. Speed was reduced by the time you passed abeam of Hog Island Lighted Bell Buoy «12» at 0814. At this time Buoy «12» was abeam on your starboard side at a distance of 0.65 mile. Assuming you continue to make good your course of 202°T, what is your new speed if you pass abeam of Cape Charles Lighted Bell Buoy «14» at a distance of 1.5 miles at 0907?
The correct speed is 12.9 knots. The distance of 11.4 nautical miles run along a course of 202T between 0814 and 0907, divided by the 53-minute time interval, yields a speed of approximately 12.9 knots.
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