2006 e350

I have a 2006 e350 without a nav system. I have the command but what else do i need to have the nav ready.
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Comments
Had an '07 wagon; great car. Had for 47 months and 39k miles.
Saw the new "11 wagon and ordered asap.
Thousands of improvements over the '07.
Traded at the right time and paid half price for the '11: pd. $35k on a $65k car including sales tax and title.