"if you aren't stupid on the internet" is a big assumption.
You can buy cheapie little velcro-attachable shades that fit gps units. My Garmin is generally nice and bright but I drive a convertible and I doubt any unit can stand up to direct daylight like that. I forget who made mine but it was about $15. Way overpriced based on material (probably cost under a dollar to manufacture) but worth the money in terms of functionality.
As an aside, I have an iPhone and have zero interest in reading books or magazines on it.
You are kind of lucky you broke yours. I love my iPhone but will be torn about buying the new one in June. At least your decision has been made easier for you (assuming you like the phone).
"The wise man speaks when he has something to say, the fool speaks when he has to say something."
A move fully endorsed by Darwin.
I met Paul Rand once, and he was an asshole. Berated poor student me for buying the softcover, not hardcover, version of his latest book.