nautical sextant

例句：

1. 1.The sailor used the nautical sextant to navigate through the fog.
   那位水手使用航海六分仪在雾中导航。
2. 2. The pilot relied on the nautical sextant to determine his course.
   飞行员依靠航海六分仪确定航线。
3. 3.The captain used the nautical sextant to plot a course for the ship.
   船长使用航海六分仪为船只规划航线。