Thanks for reading my thread, The system uses the car speakers through a built in FM modulator, channel 6 on radio. Displays maps and plays music at same time, just cuts in with the next direction.
The good side of the set-up is how many functions it has, Only down side to it, there's no bluetooth function and cant be used as a monitor for reversing camera ect.
Great piece of kit for the money, Has 7" screen and does more than any other sat nav.