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I figured it out.

The GMapping node was missing configuration parameters which would tell it agongst other things, what topic to publish map data to. See below :

<node pkg="gmapping" type="slam_gmapping" name="gmapping" output="screen">
   <param name="map_frame" value="map"/>
   <param name="base_frame" value="chasis"/> 
   <param name="odom_frame" value="odom"/> 
</node>

All available parameters are listed at http://wiki.ros.org/gmapping.

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