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Took delivery of a 2015 Tahoe LT. Turn by turn direction with OnStar is OK, but only shows me a square with a direction arrow in it. How do I get the nav system to show me an actual map. So far this is substandard compared to even the cheapest Tomtom....I know GM had to do better than this...

Easy question, I think. The transfer case selector has a "4HI" mode. I pray that's a no-kidding 4WD mode....everything locked in and not depending on the computer to decide where to send torque. Is it? I'd assume "Auto" is the computer-controlled mode. Thanks for any help.