iTuner: working through your phones WiFi or mobile data connection iTuner allows you to connect to internet radio stations around the world. Text to Speech SMS: Your truck will read your SMS messages to you to allow you to keep your eyes on the road. Satellite Navigation: all Isuzu Trucks come sat-nav ready and by upgrading to Isuzu Satellite Navigation you will gain access to features such as enhanced 3D map images incorporating city models and landmarks, truck specific information and route calculation, text to speech guidance and split screen functionality that allows you to view maps and media simultaneously.