Originally Posted by FixerDave
high-contrast black/white maps help a lot more than you would expect them to. Definitely worth a try. A sunshade helps as well and does protect from the elements somewhat, but it can be awkward to work around.
Some of the software I use allows you to change the rendering colors, which helps a lot.
I created a sunshade for my phone. It helps keep it dry too. That sits on a shelf because it is so large to let you work around it. It was a bit too much.
The e-ink display is an interesting idea. I don't know of any e-ink display with an auto refresh though.