25. When is great circle sailing most advantageous?

25. 大圆航行什么时候最有利？

The advantages obtained from the use of the great circle sailing are greatest in high latitudes, where, there is a large difference of longitude between the points of departure and destination.

在高纬度地区，出发地和目的地之间的经度差较大，使用大圆航行的优势最大。