Featuring a lighter and shorter chassis, The GH-3900 allows the installer to define multiple I/O interfaces, SSEC and VMO values. An Aircraft Configuration PC Software Tool simplifies the setup of the unit, allowing installers to define and customize the presentation of colors, flight cues and navigation data. Hardware improvements include a variety of air data and heading input options as well as built-in accelerometers. The GH-3900 supports multiple data transfer protocols including ARINC 429, CSDB, RS-422, discrete and analog signals.