Multifunction Display (MFD)

Introduction
A Multifunction Display (MFD) is a versatile screen, often found in aircraft, boats, and even vehicles, that can display a variety of information and control multiple systems, serving as a central hub for navigation, communication, and other functions.
In Aviation
Electronic Flight Instrument System (EFIS) Component
MFDs are a standard part of EFIS, also known as "glass cockpit" systems, alongside Primary Flight Displays (PFDs).
Versatile Display
They can display navigational information like moving maps, weather data, traffic information, terrain awareness, and even engine status.
Backup Function
MFDs can serve as a backup for PFDs and Engine Indicating and Crew Alerting System (EICAS) screens if those fail.
Examples
MFDs can display graphics from various sensors, including traffic for anti-collision, lightning and radar for weather avoidance, and terrain and obstacles for pilot awareness.
In Marine Applications
Control Hub
MFDs are the control hub for marine electronics and other digitally-enabled equipment, providing an easy-to-access interface.
Versatile Features
They can include built-in chartplotters, fishfinders/sonar, radar displays, autopilot control, and even video from onboard cameras.
Data Integration
MFDs can integrate with a wide variety of remote sensors and other devices, such as autopilots, VHF radios, satellite weather receivers, and engine data sensors.
Examples
MFDs can display AIS data, be a chartplotter, fishfinder, and some even support radar and video.
In Vehicles
Information Display
MFDs in vehicles provide useful information to the driver, such as fuel consumption, maintenance notifications, and vehicle status.
Examples
MFDs can show the clock, outside temperature, driving information, and climate control settings.