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Hi Dornhege thanks you very much for your reply. Just fixed the bug. The remapping in launch/turtle_spacenav is not correct. It was: <remap from="" "turtle_spacenav="" joy"="" to="" "joy"=""> I changed it back to <remap from="" "spacenav="" joy"="" to="" "joy"=""> Now it works. I am quite happy. It is a bug in the tutorial. Someone should fix it. thanks a lot.

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