At 1200 zone time on 10 October, you depart San Francisco, LAT 37°48.5'N, LONG 122°24.0'W (ZD +8). You are bound for Yokohama, LAT 35°27.0'N, LONG 139°39.0'E, and you estimate your speed of advance at 22 knots. The distance is 4,536 miles. What is your estimated zone time of arrival at Yokohama?

Correct Answer: Option B — 1911, 19 October

Establish elapsed transit time from distance and speed of advance. Convert initial zone time (ZD +8) to Universal Time Coordinate, add travel time, and convert to destination zone time in Japan (ZD -9), accounting for the eastward crossing of the International Date Line per Bowditch guidelines.