UKPassats

I have recently bought this and I am trying to get to grips with the media system. A few questions, how do you input a postcode for the destination ? , I can only input an address it seems, and can you turn of the sat nav display between the speedo/rev counter? When I try to get it to display the speed, it asks if I want to quit the navigation, I don't, I just want the speed displayed while using the sat nav. I think the unit is a Discover Media (Gen 2 )
OK, found out about the postcode input, still wondering about the display .