Hi, I have seen some reports of that judgment, it is usually the case in some Chinese devices (Dual Sim).
The solution requires:
1.- root
2.- android sup to 4.0.3
3.- xposed XPrivacy framework
The steps to be taken
1 .- Install xposed and XPrivacy activate it and make reboot
2.- Install Navigon Gps but not opening
3.- Open the X Privacy and search for the Navigon GPS from the list of programs, and press on. In the list of features, you must select the "Identification"
4.- Once you have selected "Identification", will be deployed another list of features. There are only select (click) the "SERIAL", the rest leave blank.
5.- Exit the XPrivacy, open Navigon, and already then fully recognized the record for the full download.
Just remember that the xposed carries its risks, but... we now assess each
Greetins.