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- Q135 - Navigation Problems: Oceans
645. Your vessel will sail from a position in LAT 8° 51.0' N, LONG 81° 31.0' W to a position at LAT 33° 51.5' S, LONG 151° 13.0' E. The distance by great circle is 7,635 miles, and you estimate an average speed of 15.0 knots. What is your estimated zone time of arrival if you depart at 1510 ZT, on 23 July?
The estimated time of arrival is determined by adding the steaming time (21 days, 5 hours) to the departure time (1510 ZT on 23 July), then adjusting for the difference in longitude between the departure and arrival locations, resulting in an arrival zone time of 1110 on 14 August.
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