The mapping function will cost $500 when it's available. It will not be on the system when it first ships.
There are a lot of data sources out there and it will depend on where you live what it will cost. We hope US data will be free, but outside the US you will probably need to pay Jeppesen. None of this is for sure yet, but you can be sure that we will have a more affordable update system than almost any other system out there.