Digital star charts
I use a lot of charts for my visual observations. It's a big pile with binders: one for my "binocular stars", one for summer and one for winter constellations, one for bright Miras, ... .
Would it be one option to go digital? I could put all the maps as PDF on an e-book reader? They have the advantage that they don't give annoying (white) light like an i-pad or notebook, you still can use a red flashlight. It would also be handy to take with me on a trip, I don't need to print out paper for updates, ... .
Is there anyone that works this way? Or is this just a bad idea (moisture, ...)?