Anyone who build robots ponders the problem of navigation at one time or another. Humans seem able navigate using an internal map that stays up-to-date even with our eyes closed. A new report in the Journal of Experimental Psychology may have some answers. Entitled, Spatial Updating of Locations Specified by 3-D Sound and Spatial Language (PDF format), the article covers topics that will be just as interesting to robot engineers as psychologists. A summary of the findings can be found on the ScienceDaily web site.