Ok now I've got a better understanding of your situation. All navigation devices have a screen. The thing is if you already have a player in your car than its better to buy a navigation device like garmin or any other one and place it over the dash where it is clearly visible and you may also be able to connect it with your player through aux but if you want in dash navigation than you will have to buy an hu with gps and navition but your car must have space for 2 din hu. If not than you will have to buy a hu with retractable screen. One more thing in cultus the space for hu is very low so installing hu there is not feasable as you wont be able to see the screen, your best bet is to buy a portable navigation device as they can be placed any where. An other option is to buy an android tab and install navigation on it and use it for navigation.