Given that inventory space is pretty tight, i think it would be nice if maps got added into your inventory on a separate tab. all the maps (which i know are kind of stupid since i'm sure there's a million web pages with the same info available) i got as the pre-order bonus are still sitting in their containers since i dont have room to take out all the maps. Hell, just the handful of map containers are enough of a burden as far as inventory space goes.
You should be able to read a map and add it to your known maps, the same way you just need to read a recipe once.