What navigation system do you have? Is it a factory one on a Boxster or something else like aftermarket.
The navi system should've come with the CD's or DVD's you need for use in the US. Depending on how old it is there are updates that you could probably purchase from the manufacturer.
I have the traffic pro, and it came with 2 cd's one for east coast and one for west coast. my navi system will ask for the cd when it needs it while you are driving or i can just keep it in the deck.
Good Luck,
Larez2
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