Bruno,

Here are the links to gliding software (WinPilot) that runs on an iPad:

For Europe:
https://itunes.apple.com/WebObjects/...539701244&mt=8

For the USA:
https://itunes.apple.com/app/winpilo...540473050?mt=8
https://itunes.apple.com/WebObjects/...643348142&mt=8

The software can run either stand alone (you will need a version of the iPad with a built in gps), or connected to your existing flight computer - you will need a connection module like this one:
http://www.butterfly-avionics.com/bu...rface-for-apps

If you have a Butterfly vario, WinPilot will connect to it natively, including the Climb Maximizer.

Have fun!

Jerry