Hi, I'm Eunchul Jeon, I saw following warning when I run the rosrun gmapping slam_gmapping scan:=base_scan [ WARN] [1290084259.016741027]: Message from [/hokuyo_node] has a non-fully-qualified frame_id [laser]. Resolved locally to [/laser]. This is will likely not work in multi-robot systems. This message will only print once. [ WARN] [1290084273.997493021]: MessageFilter [target=/odom ]: Dropped 100.00% of messages so far. Please turn the [ros.gmapping.message_notifier] rosconsole logger to DEBUG for more information. and I ran the roswtf command, and saw following warning WARNING The following node subscriptions are unconnected: * /rviz_1290083985383805192: * /scan * /reset_time * /slam_gmapping: * /reset_time * /LaserListener: * /base_scan1 Maybe I need to connect reset_time node but I can't find any information about that. Thank you in advance your help. -- ================================================ Eunchul Jeon M.S. Student, Intelligent Systems and Neurobotics lab, Dept. Computer Science, KAIST Science town, Daejeon, 305-701, South Korea TEL: 82 42 350 3580 E-mail: jsharp@kaist.ac.kr, jsharp83@gmail.com Homepage: http://isnl.kaist.ac.kr ================================================