For X11 systems, including, FreeBSD, Solaris, Irix, RedHat, SuSE, OS/2, Win32, Mac, Indy and O2. Requires plib 1.4.0+, SimGear-0.0.16 and OpenGL highly recommend. Debian packages available. Supports multiple monitors. Most accurate and realistic terrain of any home computer flight sim. Most of the world can be downloaded in 10x10 degree chunks. Check out the scenery in the USA; Hell's Canyon OR, Crater Lake National Park OR, Grand Canyon CO, Ranger Creek WA, Mount Rainier WA, Death Valley CA, Dixie National forest UT and Staircase-Escalante National Monument just to name a few. FAA 14CFR approved version is also being developed.