I have read somewhere, that you have to change to english language, to see all benefits. I can confirm this, too. Btw. The sometimes advertised free Navigon GPS App is a hoax. All you can get, is a 30 days trial. I deleted it right away.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?