Do you still have the corrupt display on your GPS or was there ever a resolution? I think my Garmin GPSmap76 has the same problem. Yesterday after booting it kept displaying a vertical line on the screen would not shut off 
I tried new batteries but then I remembered something I think you mentioned about disabling WAAS. I tried that and it seemed to work okay for the rest of the day.
I've had the unit two years now and it never gave me any problems.
Manny
I tried new batteries but then I remembered something I think you mentioned about disabling WAAS. I tried that and it seemed to work okay for the rest of the day.
I've had the unit two years now and it never gave me any problems.
Manny