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LETS SAY YOU PROGRAM YOUR TRIP TO SAY BG AND THEN MAYBE AN HOUR OUT YOU DECIDE TO WATCH A DVD FOR AND HOUR, WILL YOU LOOSE ALL OF YOUR PROGRAMED NAV INFO AND NEED TO RE-ENTER IT? OR WHEN YOU PUT THE NAV DISC BACK IN AFTER THE MOVIE, WILL THE COMPUTER PICK UP THE DIRECTIONS WHERE IT LEFT OFF.:rolleyes