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Well Hector is able to work without any odometry support. In such a case Hector uses the laser data only to calc. its location in respect to the map. As long as the laser data are meaning full hector will work well in this mode, i.e. the range, noise, updated rate and vehicle speed stay within some bounds. For example, the hokuyo URG-04LX has a range of 4-7m (if i remember correctly) which means your environment should not have spots larger the 4-7m free space. As rule of the thump you can say that at least 50% of the beams should stay within half of the max range. Therefore your outdoor conditions are easily violating this rule of the thump.

Hope this helps.