With the SteFly Rotary Module it is also very easy to operate XCSoar. It includes the same functions as the Remote Stick, except the mouse feature (will be implemented soon). Especially for selecting and scrolling through waypoints, the rotary encoders are very comfortable. In future we will implement press and rotate functions for more intuitive volume and MC controle.
The Rotary Module fits for both display sizes and it is fixed with the two lower screws of the OpenVario device. For detailed dimensions, have a look at this drawing.
Both input devices can be combined, but you have only two USB ports on the OpenVario. If you would like to install an extended USB port in your panel for data transfer, you need a switch or an USB hub.