On 21 May at 0630 PDT, (ZD +7), your vessel takes departure at the San Francisco Sea Buoy, LAT 37°45.0'N, LONG 122°41.5'W, enroute to Kobe, LAT 33°52.0'N, LONG 135°00.0'E via great circle. The distance is 4,245 miles, and you estimate that you will average 14.0 knots. What will be your estimated zone time of arrival?
Official USCG Answer & Rule Citation
Correct Answer: Option B — 1342, 3 June
Voyage duration is calculated by dividing great circle distance by vessel speed ($4245 / 14 = 303.2$ hours or 12.63 days). Factoring departure time, zone descriptions, and crossing the International Date Line establishes the estimated zone time of arrival as 1342 on 3 June.
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