Hi, all: Sorry for my amateur question. I'd love to try out some simple robot control demos of ROS. So, I went to http://www.ros.org/wiki/AllTutorials and tried pr2_simulator, but it seems the tutorials here are too old and I failed to find pr2_2dnav_gazebo (but pr2_2dnav found), and pr2-simple-fake_localization.launch doesn't existing at all. So, can anybody please show me where to find a runnable robot navigation or robot control demo of ROS, including the source code, so that I may be able to revise the source according to my own control requirement? Thanks in advance. Best Regards JIA -- Welcome to Vision Open http://www.visionopen.com