The Anywheremap Duo has a 7" sunlight-readable screen that can be used for many aviation applications, including approach plates, though it may be that others would prefer a larger screen. The device is based on a Viliv X70 but be aware that the sunlight-readable screen isn't available on normal retail versions, rather, they come on bulk orders only as far as I can ascertain. Anywheremap aren't interested in the European market but I would imagine there is nothing to stop you from trying to source one of these sunlight-readable devices and load European approach plates and other applications on it.
Anywhere Map - Aviation GPS with Weather
Just a thought.
VC10 Rib22
