Your vessel departs Seattle at 1010 zone time, (ZD +8), on 28 May bound for Apra, Guam, (ZD -10). The distance by great circle is 4,948 miles, and you estimate that you will average 18.5 knots. What is your estimated zone time of arrival?

Correct Answer: Option A — 0737, 9 June

Transit duration for 4,948 miles at 18.5 knots totals 267.46 hours (11 days, 3 hours, 46 minutes). Crossing the international date line into a negative zone description (-10) requires adjusting zone times, resulting in ETA 0737 on 9 June.