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I have found that on my Road Glide most of the "glare" is the reflection of the shirt that I'm wearing. If I wear my vest or a plain dark colored shirt, I can navigate a lot better. Just a thought.
Have seen several glare stomper (style) covers on trike GPS units. They look a little funny until you get used to them but they do work very well. I have the same glare issue. Was told not to buy a GPS for a car but did anyway. Now I understand why. Hindsight ya know.