Default head-up display
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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.
Current altitude relating to sea-level in feet (1 feet = 30 cm).
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'.
To change the coordinates-system, go to Autopilot > Set Lat/Lon-format.
Currend speed related to the ambient air in kts (1 kts = 1.852 km/h).