Electronic Flight Information System

An Electronic Flight Information System (EFIS) is a type of electronic display (usually a CRT or LCD) fitted to the cockpit of an aircraft in order to display flight information. EFIS is more efficient in use of space, easier to understand and less costly to maintain than the gauges that traditionally display information in older cockpits. EFIS is pronounced ee-fis.

EFIS-equipped airplanes are frequently referred to as having glass cockpit, a slang reference to the TV-style displays.

In addition to the display units (DU) a complete system will include symbol generators to drive the displays and various data sources including an Attitude and Heading Reference System (AHRS) and air data computer (which may be combined in a single box). There will also be navigation inputs such as GPS, scanning distance measuring equipment (DME), or the Inertial Reference System (IRS).