Thanks for filling me in!Becker is a plug in alternative to nav that comes in the media package. It gives you the same features as the media package nav but you have the standard 5.8" screen instead of the 7" screen.
What you lose is the Sirius weather, traffic, and the internet connectivity.
The Becker cost is $200 for the factory pre-wire and $600 for the Becker unit
There a great YouTube video by a Mercedes dealer. Google "Mercedes Becker Demo"
Hope that helps.