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Tha app that follows with a phone my differ in different customizations for different markets/regions. If you don't have Navigon Xperia edition preinstalled or in Xperia Lounge, you can download it from Google Play instead:
https://play.google.com/store/apps/details?id=com.navigon.navigator_select_sony_eu
Same for me and even when i click this google play link the information i get is that i have no device compatible with the app 
Same to me