I have a Chinese double din Android Radio which I am trying to install Tom Tom on. I have tom tom installed but somehow it wont pick up the GPS device. The Apk will install in the device memory but the maps sit on my SD card as I cannot get access to the device memory as access is restricted. Tom Tom starts normally but the start screen does not show my location. Searching POIs addresses etc is possible but Navigation not possible as the device GPS is not picked up.

Google Maps works fine though!

I think you need ROOT.