Default head-up display
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This is a short description of FlightGears default Head-up display (HUD), it can be (de)activated with the [h]-key. To change the brightness, press [shift]+[h].
There are also two so called 'minimal' HUDs available which are accessible with [shift]+[i], to return to default HUD press [i].
Some of the HUDs options can be altered in the menu: View --> Adjust HUD Properties
Current speed relating to the ambient air in knot/knots (kt/kts) (1 kt = 1.852 km/h).
Current altitude relating to sea-level in feet (ft) (1 ft = 30.48 cm).
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.
Current altitude above ground in feet. Relating to the location of the aircrafts radio altimeter therefore it's not zero if the aircraft is on the ground.
Displays the g-force to the pilot in g - to avoid black-/redout.
- The value riding on top of the Airspeed indicator.
Direction of the aircraft relating to the geographical North pole in degree (360 degree scale).
To change the coordinates-system, go to Autopilot --> Set Lat/Lon-format.
Like set with [Home]/[End].
- It's the left marker of the Elevator indicator.
Displays the aircrafts pitch relating to the grounds level/horizontal in degree. It's used as an artificial horizon.
- The big ladder like looking indicator at the HUDs centre.
- Attitude indicator
The basic setup of the above described default HUD is defined at
There is also a 'Runway projection' available which is, because of some issues, disabled by default.
Documentation can be found at
Since FlightGear 0.9.10 there is also a newer and more flexibly HUD-system available. An example can be found at
- $FG_ROOT/Huds/NTPS.xml and documentation at
Also have a look at $FG_ROOT/Huds/README.
While the instruments and their behaviour are set in the Huds-directory, the basic settings and the look regarding to any HUD are set in $FG_ROOT/preferences.xml. Search the file for <hud> and you will find a list of properties. For a short description of those have a look at property tree. But I'll give some of them a closer look:
The prefered thing one would like to customize is, I guess, the HUDs colour.
Discover your own settings is quite easy: Access the property tree via the Menu File --> Browse Internal Properties or via the Property server and your browser. Go to sim/hud/color, e.g. http://localhost:5500/sim/hud/color, edit a value and watch the result in FlightGears window instantly.
Once the decision is made copy one of the <color n="x">-tags and paste it on top of the colours within the <palette>-tag. ... Interrupted ... to be continued ...
More information about FlightGears property tree and on how to access it can be found at its page: Property Tree.
Paths starting with '$FG_ROOT/' apply to the file system, the others are intra-property tree.
/sim/hud current-color (0|1|2...) One out of /sim/hud/palette enable3d (false|true) hud n=0 3D off|on enable3d (false|true) hud n=1 3D off|on frame-stat-type (tris|???) ??? path (Huds/...) Path to hud n=0 path (Huds/...) Path to hud n=1 visibility (false|true) hud n=0 hidden|visible visibility (false|true) hud n=1 hidden|visible /sim/hud/color/ Contains settings of current-color alpha (0...1) 0=invisible, 1=nontransparent alpha-clamp (???) ??? antialiased (false|true) Antialiasing off|on blue (0...1) brightness (0...1) 0=dark/black green (0...1) red (0...1) transparent (false|true) Transparency off|on /sim/hud/font/ name (*.txf) One out of $FG_ROOT/Fonts size (8) Size of font /sim/hud/palette/ /sim/hud/palette/color/ Settings of predefined colors, nearly /sim/hud/palette/color[n]/ the same options as in /sim/hud/color.