Use the GS Reference Mapper to generate mapping results from 454 Sequencing data sets. Quick Start Documentation New Reference Mapper Project Create a new Mapper project. Read Help Browse the help topics about using this application. Open a Mapper Project Open a previously created Mapper project. Support Open a browser and navigate to the Roche support site. Reopen a Recent Project Open one of the most recent projects you were working with. Click on the link to select a project from the list.