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A Head-up display (HUD) could be (de)activated in FlightGear with the h-key. To change the sharpeness, press Shift + H.

Functions

 
Aileron

Aileron

 
Altitude

Altitude

Current altitude relating to sea-level in feet (1 feet = 30 cm).

Elevation

Current altitude above ground in feet. Related to the location of the radio altimeter therefore it's not zero if the aircraft is on the ground.
No picture (yet), it's the next scale to the left of 'altitude'.

 
Elevator

Elevator

 
Heading

Heading

 
Location

Location

To change the coordinates-system, go to Autopilot > Set Lat/Lon-format.

 
Rudder

Rudder

 
Speed

Airspeed

Currend speed related to the ambient air in kts (1 kts = 1.852 km/h).

 
Thrust

Thrust