[alf1956]

Hello I have just got a 2010 3 series BMW 320 diesel which has a built in sat nav but when I try to go onto the sat nav it comes up with a "no signal" message. I can see that there is a micro SD card in the sat nav slot to the bottom right of the sat nav/radio, I have taken out the SD card & put it back in but it's still the same. I don't have a manual for the car so I cannot refer to it to see what the problem is but I am hoping to get one next week.