I just thought about this: is the MK4 navi based on VDO Dayton MS5500 hardware? Does anyone have software upgrade disks for VDO systems? Maybe the modules are compatible and you could replace texts/languages from VDO files or even add features from the VDO system. Check out the VDO user manual: http://www.vdodayton.com/default2_an...id=510234.aspx
There is also MS5700 with 3D and 9 languages: http://www.vdodayton.com/default2_an...s_5700_sd.aspx