Not a terribly attractive solution, I'm afraid, but a pragmatic one. The Aware+'s gps screen is not as easy to see in sunlight as the manufacturers claim, which made it necessary for me to shield it with my hand when reading it last week.
So I made this visor out of corroflute covered in insulating tape. I fitted velcro to it so that it can be quickly detached on the ground.
It is only a prototype, but as with the prototype rotating map (made from a flowerpot), it will probably stay in use.