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Without the frame_locked parameter the marker object will be placed into the RVIZ view with the transform at the time it was produced. The location of the marker in RVIZ is then set and will not change in the future even If the TF tree changes.

However if you set the frame locked parameter, future changes to the TF tree will effect the location of the marker. This means changes to the TF tree will be reflected in the markers position in real time.

Hope this helps.

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