Navigation and Communication Systems in the Field of Avionics, namely, GPS receivers, communication transceivers, transponders, audio panels comprising hardware and software for controlling transmission and reception of radio signals, weather radar, Terrain Awareness and Warning Systems (TAWS) comprising hardware and software for determining when a terrain hazard exists and for outputting corresponding alerts to an aircraft pilot or crew, Automatic Flight Control Systems (AFCS) comprising hardware and software for automatically controlling flight of an aircraft, Attitude Heading and Reference Systems (AHRS) comprising hardware and software for providing aircraft attitude and heading information for use by a pilot, flight crew or other avionics, Primary Flight Displays (PFDs) comprising hardware and software for displaying navigation and flight information and for controlling avionics instruments, and Multi-function Flight Displays (MFDs) comprising hardware and software for displaying navigation and flight information and for controlling avionics instruments