navigation/launch/navigation.launch

<launch>
    <arg name="logOutput"  default="screen" /><!-- log: 输出至文件 screen: 输出至屏幕 -->

    <rosparam file="$(find navigation)/config/navigation_cfg.yaml" command="load" />
    <node pkg="navigation" type="navigation_node" name="navigation_node" output="$(arg logOutput)">

    </node>
</launch>