Skinny

Is there any way to get a better CD that controls the navigation system? I don't like the voice giving directions. I also wonder why it is not possible for a passenger to use the navigation system while the car is moving? I understand safety as the reason the driver cannot navigate while the car is moving, but the seat belts know when a passenger is uckled, why not interconnect the seat belt information to allow a passenger to navigate?Finally are there different navigation systems available for the car? It is just a CD, so why couldn't thre be different options for different tastes?