I know that with a GT the nav/satellite is supposed to update the clock, or at least the minutes column with the hour determined by the region. But my clock is out 4 hours and 20 minutes, and my region is set to where I am. In the nav config I cannot adjust the hours +1 or -1 as the time is listed as blank. Any ideas? We are having some problems with the navigation locating where we are as well (pre-calibration), so I'm wondering if this might be an antenna issue? It almost seems like the satellite isn't picking it up or something. If you have any ideas I'd be very appreciative.