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Hi There, You don't need to broadcast this transform at all. In-fact doing do will confuse the TF system. If your system is already broadcasting the two TF's map -> odom_combined and odom_combined -> base_link then the job is done. The TF system can work out any transforms from map to base_link automatically.

To view this in Rviz you will need to make sure that the fixed frame is set to map. This is an option in the top left of the UI.

Hope this helps.