For a basic moving map function, Oziexplorer is now available for Android and apparently (I have no way to test it myself) it works very well.
Loads of aviation charts exist for Ozi; some are even current
The subject of aviation charts is a sore point in Europe because all the data is tightly copyrighted even though all of it was produced with taxpayer money.
I have the use of an Ipad2 which, with an external GPS, works OK, but is very short of moving map apps which can run mapdata that is actually relevant! If I was getting a tablet for flying I would buy the Samsumg Galaxy 10" tablet which is virtually identical in ergonomics etc to the Ipad2 but it runs a lot more stuff and is more or less totally "open" so you can move files in or out of it. With the Ipad, one just tears one's hair out trying to do something useful - even trivia like moving a PDF onto a flash stick or whatever so you can get it printed off.