Am I being stupid? I am happy with the fact I can use the SatNav via an SD card and play music from it at the same time. However, how do you just have the SatNav on without any audio source? ie no radio on or music from a CD or SD card. As soon as I turn the unit on usually the radio comes on and then I can select SatNav as well if I want. Then I don't no how to switch off the radio if I want. Can anyone help?

You should be able to mute the radio, the sat nav will still cut in where applicable as the volume for the sat nav and the radio are independant (If it works in the same way as the Columbus anyway)

You should be able to mute the radio, the sat nav will still cut in where applicable as the volume for the sat nav and the radio are independant (If it works in the same way as the Columbus anyway)

Thanks it has worked a treat