PDC / rear cam is ready within 2 seconds of starting the ignition. There's a fast boot sequence for that.
The nav takes a good 15 seconds to initialize during which time the rest of the nav still works. Of course it starts booting when you unlock the door so for the most part by the time you want to use your nav, it's already done booting.
NBT's processor is over twice as fast as CIC's and it really shows. P.S. look at the copyright screen. It's Linux based too.
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