I use a basic 32GB iPad with WiFi (so no sim card fitted). For the GPS information I have a seperate "Bad Elf" GPS receiver that connects to the iPad via Bluetooth.
This all works so well that I now will only fly with it - not for navigation
per se but the airspace warnings/notams etc. I still use traditional map and flight log methods but also keep an eye on the Skydemon to see that I am following my preplanned route. If weather forces a diversion from that line the airspace warning function gives me a few minutes assess if I am potentially heading for an infringement.
All of this whilst keeping a "hawk like" look out for other traffic - before you mention "head down" guys
Used properly Skydemon is very useful and I would recommend trying it.