The iPad is an excellent viewer. The Jepp TC app for iPad is also excellent. However, neither it nor Ozrunways have GPS support for the terminal charts. There was some talk a while ago that Jepp TC was going to add GPS tracking for the terminal charts, but currently you need Jeppview / Flitedeck for that. In the air, Flitedeck is a very powerful application. The companion programme Jeppview is for viewing enroute charts and the AIP and creating routepacks that are read by Flitedeck.