The DAGR includes a Graphical User Interface (GUI) and incorporates a next-generation security device called the Selective Availability Anti-Spoofing Module.

该DAGR包括一个图形用户界面（GUI），并采用了新一代安全装置称为可选择有效反干扰模块。

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In the absence of the selective availability errors, the positioning accuracy of differential GPS is strongly dependent on the spatial decorrelation of the ionosphere.

在没有选择可用性条件下，差分gps定位精度完全取决于电离层的空间不相关性。

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That distortion, known as "selective availability, " or SA, was turned off last year.

FORBES: Europe Reinvents GPS