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- Q135 - Navigation Problems: Oceans
190. At 1820 zone time, on 21 March, you depart San Francisco, LAT 37° 48.5' N, LONG 122° 24.0' W (ZD +8). You are bound for Melbourne, LAT 37° 49.2' S, LONG 144° 56.0' E, and you estimate your speed of advance at 21 knots. The distance is 6,970 miles. What is your estimated zone time of arrival at Melbourne?
The voyage time is calculated as 13 days and 19.9 hours. Converting the departure time of 1820 on 21 March in San Francisco (ZD +8) to GMT yields 0220 on 22 March. Adding the voyage time to this GMT arrival time results in 2214 on 4 April GMT. Finally, converting this GMT time to Melbourne's local zone time (ZD -10) gives an arrival time of 0814 on 5 April.
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