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

Functions

Aileron

 
Aileron

Airspeed

 
Airspeed

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

Altitude

 
Altitude

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

Autopilot

If autopilot is activ the direction of the next waypoint is displayed as well as the next two and the last waypoint of the Autopilot > Route manager list.
No picture (yet) and not displayed on the appended pictures at all.

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

G-load

Displays the g-force to the pilot in g - to avoid black-/redout.
The value riding on top of the Airspeed indicator.

Heading

 
Heading

Direction of the aircraft related to the geographical North pole in degree (360 degree scale).

Ladder

Location

 
Location

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

Pitch

Like set with [Home]/[End].
It's the left marker of the Elevator indicator.

Rudder

 
Rudder

Thrust

 
Thrust