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If you already have created a map then you don't have to use gmapping
anymore. gmapping
is for SLAM : Simultaneous Localization and Mapping so you just need to localize the robot in your map.
What exactly have you run to get this result ? I assume you've just launched map_server
to get your map and then gmapping
? Instead take a look at the file navigation.launch from your package, they launch the map_server
node and then they use the package AMCL
for the localization.