hi, slam_gmapping 1.1.1 has been released against latest. This unstable release is not recommended for most users. The changelist is below. No more new features are expected for inclusion in the next stable release, slam_gmapping 1.2.0. brian. 1.1.1 (2010-05-12) * gmapping * Added transform logic to support upside-down lasers #3052. Still needs to be tested on a real robot with an upside-down laser. o Corollary: removed inverted_laser parameter. * Changed tests to use new indexed bag files