Emit the Garmin AV400 protocol required to drive a Garmin 196/296 series GPS

Emit the set of AV400 strings required to drive a Garmin 400-series GPS from FlightGear

Set the ADF1 radio frequency, optionally preceded by a card rotation.

Set the ADF2 radio frequency, optionally preceded by a card rotation.

Select aircraft aerodynamics model to load

Add and enable a new scenario. Multiple options are allowed.

Select an aircraft profile as defined by a top level <name>-set.xml

Specify the exact directory to use for the aircraft (normally not required, but may be useful). Interpreted relatively to the current directory. Causes the <path-cache> from autosave_X_Y.xml, as well as --fg-aircraft and the FG_AIRCRAFT environment variable to be bypassed.

Aircraft model directory (UIUC FDM ONLY)

Aircraft

Specify starting position relative to an airport

Starting altitude

Specify a multiplier for the aspect ratio.

Open connection using the ATC sim protocol (atc610x)

Open connection using the Atlas protocol

Audio Options

Avionics Options

Specify the bits per pixel

Specify path to your web browser

assign a unique name to a player

Specify starting position on an AI carrier

Create an overcast ceiling, optionally with a specific thickness (defaults to 2000 ft).

Set the COM1 radio frequency

Set the COM2 radio frequency

Load additional properties from path

Display console (Windows specific)

Debugging Options

Deprecated option (disable internal AI subsystem)

Disable artificial traffic.

Disable anti-aliased HUD

Disable auto coordination

Clock advances normally

Disable 2D (flat) cloud layers

Disable 3D (volumetric) cloud layers

Disable runway light distance attenuation

Disable enhanced runway lighting

Disable FGCom built-in

Start in a running state

Fuel is consumed normally

Disable fullscreen mode

Disable celestial body growth illusion near the horizon

Disable 3D HUD

Disable Heads Up Display (HUD)

Disable extra mouse pointer

Disable instrument panel

Exclude random buildings objects

Exclude random scenery objects

Exclude random vegetation objects

Disable METAR based real weather fetching

Disable Rembrandt rendering

Don't save preferences upon program exit

Disable sound effects

Disable specular reflections on textured objects

Disable splash screen

Disable automatic scenery downloads/updates

Disable textures

Disable wireframe drawing mode

Slave the DME to one of the NAV radios, or set its internal frequency.

Base directory to use for aircraft and scenery downloads (the TerraSync scenery directory may be specifically set with --terrasync-dir)

Enable AI subsystem (required for multi-player, AI traffic and many other animations)

Enable artificial traffic.

Enable anti-aliased HUD

Enable auto coordination

Do not advance clock

Enable 2D (flat) cloud layers

Enable 3D (volumetric) cloud layers

Enable runway light distance attenuation

Enable enhanced runway lighting

Enable FGCom built-in

Start in a frozen state

Fuel tank quantity forced to remain constant

Enable fullscreen mode

Enable celestial body growth illusion near the horizon

Enable 3D HUD

Enable Heads Up Display (HUD)

Enable extra mouse pointer

(i.e. for full screen Voodoo based cards)

Enable instrument panel

Include random buildings objects

Include random scenery objects

Include random vegetation objects

Enable METAR based real weather fetching (this requires an open internet connection)

Enable Rembrandt rendering

Allow saving preferences at program exit

Enable sound effects

Enable specular reflections on textured objects

Enable splash screen

Enable automatic scenery downloads/updates

Enable textures

Enable wireframe drawing mode

Environment Options

Fail the pitot, static, vacuum, or electrical system (repeat the option for multiple system failures).

Select the core flight dynamics model

Can be one of jsb, larcsim, yasim, magic, balloon, ada, external, or null

Flight Model

Features

Specify additional aircraft directory path(s) (alternatively, you can use --aircraft-dir to target a specific aircraft in a given directory)

Specify the root data path

Specify the scenery path(s);

Defaults to $FG_ROOT/Scenery

Use a model viewer rather than load the entire simulator;

Specify starting position relative to a fix

Open connection using the Flarm protocol, which includes NMEA/GPS and traffic reporting messages

Read all waypoints from a file

Disable fog/haze

Enable fastest fog/haze

Enable nicest fog/haze

Specify field of view angle

Abort on encountering a floating point exception;

Open connection using the Garmin GPS protocol

General Options

Open connection using a predefined communication interface and a preselected communication protocol

Specify window geometry (640x480, etc)

Specify flight path angle (can be positive)

Specify heading (yaw) angle (Psi)

Show the most relevant command line options

Enable http server on the specified address. Specify the port or address:port to bind to.

Hud displays percentage of triangles culled

Hud Options

Hud displays number of triangles rendered

Start in air (implied when using --altitude)

IO Options

Open connection to an Agwagon joystick

Enable screen shot http server on the specified port (replaced by --httpd)

Open connection to a remote joystick

Print a report in JSON format on the standard output, giving information such as the FlightGear version, $FG_ROOT, $FG_HOME, aircraft and scenery paths, etc.

Select the language for this session

Starting latitude (south = -)

Select aircraft livery

Specify which logging class(es) to use

Log to directory DIR. The special value 'desktop' causes logging to the desktop (OS-dependent location). This option may be given several times, using a different value each time. Inside the specified directory, the written log file is named FlightGear_YYYY-MM-DD_<num>.log, where <num> takes the values 0, 1, 2, etc.

Specify which logging level to use

Starting longitude (west = -)

Specify initial mach number

Specify the materials file used to render the scenery (default: Materials/regions/materials.xml)

Maximum frame rate in Hz.

Pass a METAR string to set up static weather (this implies --disable-real-weather-fetch)

Allows you to define a minimum status level (=development status) for all listed aircraft

Run the FDM this rate (iterations per second)

Specify multipilot communication settings

MultiPlayer Options

Open connection using the FG Native Controls protocol

Open connection using the FG Native protocol

Open connection using the FG Native FDM protocol

Open connection using the FG Native GUI protocol

Set the NAV1 radio frequency, optionally preceded by a radial.

Set the NAV2 radio frequency, optionally preceded by a radial.

Specify starting position relative to an NDB

Specify the frequency of the NDB. Use with --ndb=ID

Network Options

Open connection using the NMEA protocol

Do NOT attempt to trim the model

(only with fdm=jsbsim)

Specify heading to reference point

Specify distance to reference point (statute miles)

Start at ground level (default)

Open connection using the OpenGC protocol

Specify parking position at an airport (must also specify an airport)

Specify which starting position on an AI carrier (must also specify a carrier)

Specify pitch angle (Theta)

Initial Position and Orientation

Set property <name> to <value>. <type> can be one of string, double, float, long, int, or bool.

Open connection using the interactive property manager

Specify which proxy server (and port) to use. The username and password are optional and should be MD5 encoded already. This option is only useful when used in conjunction with the real-weather-fetch option.

Open connection using the PVE protocol

(buildings, etc.)

Set up random wind direction and speed

Open connection using the Ray Woodworth motion chair protocol

Rendering Options

Reset all user settings to their defaults (rendering options etc)

Specify initial climb rate (can be negative)

Specify roll angle (Phi)

Route/Way Point Options

Open connection using the RUL protocol

Specify starting runway (must also specify an airport)

Specify the startup season

Enable flat shading

Enable smooth shading

Print a list of the currently available aircraft types

Show a list of available audio device

Situation Options

Explicitly specify the audio device to use

Run the FDM 'n' times faster than real time

Specify a starting date/time with respect to

Enable telnet server on the specified port

Set target directory for scenery downloads

Anisotropic Texture Filtering: values should be 1 (default),2,4,8 or 16

Synchronize time with local real-world time

Synchronize time with real-world time

Add this time offset

Time Options

Specify a time of day

Trace the reads for a property;

Trace the writes for a property;

Trim the model

(only with fdm=jsbsim)

Specify turbulence from 0.0 (calm) to 1.0 (severe)

Specify velocity along the body X axis

Use feet for distances

Use meters for distances

Usage: fgfs [ option ... ]

Specify velocity along the body Y axis

Specify velocity along a vertical axis

Specify velocity along a West-East axis

Specify velocity along a South-North axis

Specify initial airspeed

Select an vehicle profile as defined by a top level <name>-set.xml

Show all command line options when combined with --help or -h

For a complete list of options use --help --verbose

Display the current FlightGear version

Specify the default forward view direction as an offset from straight ahead. Allowable values are LEFT, RIGHT, CENTER, or a specific number in degrees

Specify initial visibility

Specify initial visibility in miles

Specify starting position relative to a VOR

Specify the frequency of the VOR. Use with --vor=ID

Specify velocity along the body Z axis

Specify wind coming from DIR (degrees) at SPEED (knots)

Specify a waypoint for the GC autopilot;

binding subsystems

creating subsystems

downloading scenery

finalizing position

finalizing subsystems

initializing

initializing graphics engine

initializing scenery

initializing subsystems

loading aircraft

loading aircraft list

loading navigation data

loading scenery

loading fixes

loading airport data

loading navigation aid data

loading points of interest

reading airport data

Unstable nightly build - some features may be under active development

Drag while holding the right mouse button to look around

Hold [Shift] while looking around to move the view up, down, left or right

Press a/A to adjust the simulation speed

Press x/X to zoom in and out

Find frequencies of nearby ATC services from the Radios dialog

Press v to change your viewpoint, Ctrl-V to return to the cockpit

Press F3 to take a screenshot

Join the FlightGear community at http://forum.flightgear.org

Press h to bring up a Heads Up Display

Show or hide the menu bar by pressing F10

Frame-rate too low? - try disabling AI traffic

Select Environment → Weather to fly in different weather

Press F12 to change the radio frequencies easily

Look around by holding down the right mouse button and moving the mouse

Select Multiplayer → Multiplayer Settings to join the shared flight environment

Can't get the engine started? - see Help → Aircraft Checklists

Drag while holding the middle and right mouse buttons to move the viewpoint

Press / to explore the internals of the simulator

Press Tab to move the viewpoint with your mouse and use the scroll wheel to zoom