With improvements in shipbuilding and with invention of the directional compass, seamen could travel out into the open ocean, out of sight of land.
随着造船水平的提高和方向罗盘的发明，海员可以航行到看不见大陆的公海上去。
They took a sight with a compass.
他们用罗盘观测。
Other inventions like the compass permitted them to sail out of sight of land.
其他的发明如指南针，则让他在看不到陆地情况下能够航行。
Other inventions like the compass permitted them to sail out of sight of land.
其他的发明如指南针，则让他在看不到陆地情况下能够航行。
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