I work at an electric cooperative and we are thinking of replacing some of our large clumsy 500 page map books with iPads. But we want to make sure that there is a simple app out there that can handle a 500 page file and more importantly is indexed and capable of skipping to a certain page number, say pg. 369 if necessary without paging through them all. Editing them and saving it is also an option we are looking at. Just wondering what is out there...thanks for the help!