Using gnomonic tracking chart WOXZC 5270, determine which of the following statements about a voyage from San Francisco to San Bernardino Strait (LAT 13°00'N, LONG 125°30'E) is TRUE.

Correct Answer: Option C — You will cross the Northern Hemisphere vertex at the approximate longitude of 159°W.

Applying great circle sailing principles from Bowditch, the route from San Francisco to San Bernardino Strait reaches its highest latitude vertex across the North Pacific, intersecting approximately at longitude 159°W, where the track reaches its maximum northerly latitude before descending toward the Philippines.