Sat nav and software updates

Hello Tech Chaps
I have a 2016 (October) Evoque Autobiography
Could you tell me how / where to check what Sat Nav software is installed on my Evoque
Also I see from the forum that there are software updates for some build of Evoque’s. Again how can you check what updates have been installed on your car and if any others are required?
Thanks

Mine was delivered in November 2016. I have had at 4 occasions where the sat nav cannot access the postcode. e.g. I am going to Gateshead today so I thought I would look at the Angel of the North postcode NE9 6AA - not on the system!
I would also be interested on how to update it. Maybe it should be the dealer?