This app was mentioned in 1 comment, with an average of 2.00 upvotes
I got myself an 8" 4:3 tablet to display Jeppesen charts when I go flying and it has the perfect size for that purpose. But I find myself using it a lot in flight sims to display charts and maps. Also pretty nice for reading pdf files. I prefer 4:3 to 16:9 in these little screens and I really recommend 8", but if you can only afford or justify 7", it will serve your purpose.
BTW, whatever you purchase, check DCS Manager out: https://play.google.com/store/apps/details?id=fr.yeepeekai.dcs.manager