I have a new 2017 3LZ Z06. Somewhere in the middle of South Dakota last week (at about 2,000 miles on the odometer) between the Spearfish Black Hills Corvette Rally and Lake Oahe for walleye fishing, the GPS indicator on the Nav screen showed an "X" thru "GPS". The compass also said "CAL". So I tried driving in circles to reset the compass hoping that would fix the problem but no luck. Apparently there have been issues since 2015. Any advice on the fix? There seems to be a variety of opinions. I don't want to tear out the dash just to fix what might be a wiring problem and not a problem with the unit. Otherwise everything on the car is fabulous. I couldn't be happier. What a magnificent car. I'm back in Great Falls and the car still thinks it is in South Dakota.:frown2: