These days satellites are used far more widely for communications, terrestrial navigation, crop monitoring and much more.

如今卫星被更广泛的应用在通讯，陆地导航，农作物监测等等。

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The error model can be used a tool of terrestrial vehicle navigation error analysis, but also can be used in its initial alignment.

此误差模型，不仅可以作为陆地载体的导航误差分析，而且可以用于系统的初始对准研究。

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Each probe can pick up GPS signals and signals from eLoran, an enhanced version of Loran, the ground-based terrestrial radio-navigation system first used by the American and British navies during the second world war.

ECONOMIST: GPS jamming