Hello all: I have recently been looking for a good iPad app for use when flying VATSIM. I have found this great app that is free with all premium features then is $15 for a subscription thereafter. It's really worked well for me and I thought I'd put it out there for anyone else who is looking for a good app.
https://itunes.apple.com/us/app/aerochartus-aeronautical-charts/id751971884?mt=8
This link is for the US version but there are versions for other countries as well.