The siting error and L>O>P> of short distance navigation positioning system have been analyzed.

对近程导航定位系统位置线和定位误差进行了分析；

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If the distance between different levels of navigation is too large (for instance because some navigation items have more text) users have to move the mouse horizontally.

如果不同层级的导航间隔太大(比如说有的导航项目文字太多)，用户就必须水平移动鼠标。

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Radio wave bending is caused by atmospheric refraction, which leads to the distance measured by radio navigation system different from the truth.

大气折射效应会引起无线电传播路径发生弯曲，使得无线电导航定位系统中测量到的距离与真实值有一定的误差。

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With a database of approximately 1 million landmarks worldwide, users can enjoy various functions, such as Landmark Navigator which displays the distance to a nearby landmark in the direction the camera is faced towards, and Photo Navigation which displays the distance from the photographer's present location to the place where a tagged photo was taken.

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