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- Q141 - Navigation Problems: Near Coastal
253. Your vessel departs Yokohama from position LAT 35°27.0'N, LONG 139°39.0'E (ZD -9), at 1330 ZT on 23 July, bound for Seattle at position LAT 47°36.0'N, LONG 122°22.0'W (ZD +8). The distance by great circle is 4,245 miles, and you estimate that you will average 13.6 knots. What is your estimated ZT of arrival?
A 13.6-knot vessel traveling 4,245 nautical miles will arrive in Seattle at 2038 on 4 August. This calculation involves determining the total steaming time, converting the departure time from Yokohama to GMT, adding the steaming time to the GMT departure time, and then converting the GMT arrival time to Seattle's local zone time.
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