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>Entire thread is arguing about apps instead of answering the question
I hate you people so much some days
>EPUB readers
You obviously have this covered, download a couple of good books, maybe even something related to the outdoors like Into The Wild or Walden
>Map apps
Pretty good in case you get lost and aren't very good at reading a map, also you can stuff like pic related which are OS Maps to compare with satellite maps
>Camera
Taking pictures is obvious but with android phones you can do long exposures and shit, catching constellations in amazing detail. Can also do a long exposure of the ground under starlight and see how it looks lit up in the darkness.
>Star tracker
Uses a star chart overlaid on your camera (might even work without a camera) so you can tell what different constellations or even planets are
>Plant identifying apps
Pretty cool to see a leaf or flower and find out what it is, you can get ones for specific areas that work offline and it's like you just take a picture and it tells you, it's more a step by step thing that you have to figure out yourself.
>Animal/Bird/Insect identifying apps
Similar thing, lots of stuff out there. You can also just get a book with this info on it and use that instead of a dedicated app
>Bushcraft/Knots apps
There are apps that do a short gif like step by step tutorial to teach you different knots, fun to do when sitting in the tent waiting for water to boil or something. Again can just be done as a book but the app makes it easier to follow
That's about all I can think of really, personally I don't use any of these other than maps but you can give it a go. And for the love of god do not use the plant identifier to forage anything, they are decently accurate but not enough to trust for edible food and there are a lot of innocent looking plants that will kill you.
