Yes you would. I'tll cost somewhere in the $3000-4000 range.
Or you can spend 1/10th that and get an aftermarket GPS that does more than the factory unit, costs less to update the maps on, and you can take it with you when you fly someplace and use it in a rental car.
Only downside to that is it'll sit ON the dash instead of IN the dash. But you save several thousand bucks and can get more features.