• NAVIGON MobileNavigator 1.8.0 ipa for your region - you can get it from the other threads.
• Panorama Terrain files for your region - use:

• iFunbox, DiskAid or any other tool - to access folders on your device.
• iFile - to set some file properties.

• Download and unrar this file: http://www.multiupload.com/WZ3M25BFB8
• You should see there two files - NAVIGON and one .plist file.
• Open the Navigon v1.8.ipa on your computer with WinRar, 7zip or something similar.
• Go to : /Payload/NAVIGON.app and drag&drop the file NAVIGON extracted from the above archive there.
• Still there find and open Info.plist, search for key CFBundleIdentifier and copy the string value (it is region specific, i.e. for Europe it 
  should look like com.navigon.NavigonEurope) :

< key >CFBundleIdentifier< /key >
< string >com.navigon.NavigonEurope< /string >

• Rename the .plist file from the archive and make sure the name matches the copied string. You'll need that .plist later.
• Go to /Payload/NAVIGON.app/smap and drag&drop the Terrain file for your region.
• Close WinRar.
• You are ready to install the modified .ipa. Please perform clean install - i.e. first remove any versions you have both from iTunes and your device, then add the modified .ipa file to iTunes library and sync.
• Do not launch the installed application yet! Use your preffered tool to access your device and go to /var/mobile/Applications.../NAVIGON/Library/Preferences. Put the .plist file there.
• Use iFile and make sure the owner and group of the .plist are both set to mobile.