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After I was trying out the "screen off" and "screen on" commands I found out you can turn the nav in the different modes....
The modes change the color of the map screen...
say "day mode" for the bright one (turns on automatically when its light out/daytime)
say "night mode" for the night one (turns on automatically when its dark out/nighttime)
Version 2? ....been wondering if GM or dealer will send out notice of nav disk updates or do we have to followup? 2006 deal said I would get 2 free updates, but no details on when of how.