I've got the smaller screen (9.7") version of the iPad Pro (very good) with a Lifeproof Nuud case (also very good). A lot of money altogether but I use it for just about everything, including GPS Navionics apps, reading the newspaper, listening to the radio, Skype calls, taking photos, email, internet etc etc.
The case is properly waterproof but can easily be charged through a trapdoor in the base. The screen is not covered but there's a clever seal around the edge that keeps water out from the rest of the device. When the screen needs a clean, I run it under the tap! Being rubber armoured, the case protects everything except the screen from knocks. When not in use, a Portfolio magnetic cover (which doubles as a stand) protects the front.