Hi, I have recently taken ownership of an Audi A4 2009 which has the Symphony entertainment system. This has bluetooth for phone but no sat nav. What is best cost effective option for adding sat nav and / or carplay? Also, can anyone recoemmend a fitter in North London?

Have searched lots of forums and seen some possible options such as Unique Auto Developments but very little review of this kind of model and all options say install yourself which seems quite daunting.

Any advice welcomed!