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。

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They took a sight with a compass.

他们用罗盘观测。

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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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In the interests of simplifying the man-machine interface, the Lexus unit combines four buttons, one rocker switch and one compass controller, which is as delicate as a Norden bomb sight.

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