What does EFIS mean in aviation?
Electronic Flight Instrument System (EFIS) An Electronic Flight Instrument System (EFIS) is a flight deck instrument display system in which the display technology used is electronic rather than electromechanical. EFIS provides pilots with controls that select display range and mode (for example, map or compass rose) and enter data (such as selected heading). Where other equipment uses pilot inputs, data buses broadcast the pilot’s selections so that the pilot need only enter the selection once.