If your unit is still under any warranty, I would not make the holes any larger. Also, since this has been an ongoing issue, surely Garmin would have made the holes larger if the remedy would be that simple. Just keep sending your units back until the resolve it correctly!!!!!!Roadie said:
I never saw the vent holes before, but with the adjustment/mounting plate closed to mount the unit on the Garmin motorcycle mount the vent holes are sealed off and I doubt any air can vent from those holes. I wonder if you were enlarge the holes a bit if it would help with the condensation problem.