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How to generate /map topic?

Hello,

I was trying to follow some tutorials regarding navigation and mapping, and I realized that they all add the topic /map to the RVIZ Map tab. However, if I look at my active topics list I can't see a topic named /map. Is there a specific node I need to launch to get that topic? or a specific procedure that need to be followed?

Any help would be appreciated.

Thank you.