I miss it when I drive a vehicle without it. Some navigation info is displayed, though not as much detail is the dash. It will show entertainment choices as you scroll through them, speed, speed limit, etc.
Without it I find myself looking at the dash far longer than I'd like, looking at some of the info the HUD shows.
After having it on a car a few years back, I added to my wife X5. She was not all in for it at the time....now it is a must for her (and me).
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