Satnav card question

[MintyB]

Hi, I have just purchased a 2015 A3 and the satnav is activated but there is no card. I am a bit confused as to what card I would need to buy as there are so many on eBay. Do I have to buy a 2015 one? And if so how do you update the maps to current?

Also is it possible to upgrade the pop up screen so that it has car play? Or is that an astronomical price and not worth doing?

if anyone is able to explain, it would be most appreciated. TIA

[Steve Q]

It'll be expensive to upgrade the screen. 

Regarding the SD card it doesn't have to be a 2015 one.