The Wo?-Kongress will take place for the second time on December 07 and 08, 2012 in the Science Park in Gelsenkirchen. The focus this year is on mobile applications based on geoinformation and navigation data. Mobile applications are currently a big part of our work at terrestris wherefore we have decided to introduce ourselves at the venue by giving a talk. Marc Jansen will present the talk on December 07 titled: “Where? to Mobile? – Development of a WebMapping Client on Mobile Devices”.