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To be able to print messages on terminal, in launch file you should add output="screen" to the relevant <node> tag.

Also you can view ROS_INFO messages on rqt_console.

To be able to print messages on terminal, in launch file you should add output="screen" to the relevant <node> tag.

Also you can view ROS_INFO messages on rqt_console.

In reply to OP's comment:

It should be like this:

<node name="SelfLocalizer" pkg="nav2d_localizer" type="localizer" output="screen">
  <remap from="scan" to="base_scan"/>
  <param name="min_particles" type="int" value="5000"/>
</node>

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