Aircraft Radio Navigation Variables

The tables below indicate the properties for the Simulation Variables that can be used to get and set properties related to the various radio navigation systems of an aircraft and Air Traffic Control. For information on the units listed for each variable, please see here: Simulation Variable Units

You can find a complete index of all available SimVars here: SimVar Index

ADF

Simulation Variable	Index	Description	Units
`ADF ACTIVE FREQUENCY`	ADF Index	ADF frequency. Index of 1 or 2, depending on how many were defined in the Adf.N parameter of the systems.cfg.	Frequency ADF BCD32
`ADF AVAILABLE`	ADF Index	`TRUE` if indexed ADF is available. Index of 1 or 2, depending on how many were defined in the Adf.N parameter of the systems.cfg.	Bool
`ADF CARD`	N/A	ADF compass rose setting	Degrees
`ADF DISTANCE`	N/A	The ADF signal distance.	Meters
`ADF EXT FREQUENCY`	N/A	Deprecated, use `ADF ACTIVE FREQUENCY`	Frequency Frequency BCD16
`ADF FREQUENCY`	N/A	Deprecated, use `ADF ACTIVE FREQUENCY`	Frequency Frequency BCD16
`ADF IDENT`	N/A	ICAO code	String
`ADF LATLONALT`	ADF Index	Returns the latitude, longitude and altitude of the station the radio equipment is currently tuned to, or zeros if the radio is not tuned to any ADF station. Index of 1 or 2, depending on how many were defined in the Adf.N parameter of the systems.cfg.	Struct `struct`structure
`ADF NAME`	ADF Index	Descriptive name of the ADF. Index of 1 or 2, depending on how many were defined in the Adf.N parameter of the systems.cfg.	String
`ADF RADIAL`	ADF Index	Current direction from NDB station for the indexed ADF. Index of 1 or 2, depending on how many were defined in the Adf.N parameter of the systems.cfg.	Degrees
`ADF RADIAL MAG`	ADF Index	Returns the magnetic bearing to the currently tuned ADF transmitter for the indexed ADF. Index of 1 or 2, depending on how many were defined in the Adf.N parameter of the systems.cfg.	Degrees
`ADF SIGNAL`	ADF Index	Signal strength of the indexed ADF. Index of 1 or 2, depending on how many were defined in the Adf.N parameter of the systems.cfg.	Number
`ADF SOUND`	ADF Index	ADF audio flag. Index of 1 or 2, depending on how many were defined in the Adf.N parameter of the systems.cfg.	Bool
`ADF STANDBY AVAILABLE`	ADF Index	`TRUE` if ADF Standby is available, `FALSE` if otherwise. Index of 1 or 2, depending on how many were defined in the Adf.N parameter of the systems.cfg.	Bool
`ADF STANDBY FREQUENCY`	ADF Index	ADF standby frequency. Index of 1 or 2, depending on how many were defined in the Adf.N parameter of the systems.cfg.	Hz
`ADF VOLUME`	N/A	Returns the volume of the ADF	Percent Over 100

ATC

Simulation Variable	Index	Description	Units
`ATC AIRLINE`	N/A	The name of the Airline used by ATC, as a string with a maximum length of 50 characters.	String
`ATC AIRPORT IS TOWERED`	N/A	If the airport is controlled, this boolean is `TRUE`.	Bool
`ATC ARRIVAL AIRPORT HAS ATIS`	N/A	If the arrival airport has ATIS, this boolean is `TRUE`.	Bool
`ATC ARRIVAL AIRPORT IS TOWERED`	N/A	If the arrival airport is controlled, this boolean is `TRUE`.	Bool
`ATC ASSIGNED ALTITUDE`	N/A	The altitude assigned by the ATC. Returns -1 if no altitude is assigned.	ft
`ATC CLEARED IFR`	N/A	Returns whether or not the user has filed an IFR flightplan that has been cleared by the sim ATC	Bool
`ATC CLEARED LANDING`	N/A	Whether the ATC has cleared the plane for landing.	Bool
`ATC CLEARED OVERFLIGHT CTR`	N/A	Whether the ATC has cleared the plane for overflight of CTR area.	Bool
`ATC CLEARED TAKEOFF`	N/A	Whether the ATC has cleared the plane for takeoff.	Bool
`ATC CLEARED TAXI`	N/A	Whether the ATC has cleared the plane for taxi.	Bool
`ATC CURRENT WAYPOINT ALTITUDE`	N/A	Returns the target altitude for the current ATC flightplan waypoint.	Bool
`ATC DEPARTURE AIRPORT IS TOWERED`	N/A	If the departure airport is controlled, this boolean is `TRUE`.	Bool
`ATC DESIGNATED GATE ARRIVAL`	N/A	The name of the gate assigned by the ATC for arrival. Returns “None” if no gate is assigned.	String
`ATC DESIGNATED GATE DEPARTURE`	N/A	The name of the gate assigned by the ATC for departure. Returns “None” if no gate is assigned.,	String
`ATC DESIGNATED RUNWAY LANDING`	N/A	The name of the runway assigned by the ATC for landing. Returns “None” if no runway is assigned.	String
`ATC DESIGNATED RUNWAY TAKEOFF`	N/A	The name of the runway assigned by the ATC for takeoff. Returns “None” if no runway is assigned.	String
`ATC FIRST VFR ARRIVAL PATTERN WAYPOINT NAME`	N/A	The name of the first waypoint in VFR arrival procedure. Returns “None” if no waypoint is assigned.	String
`ATC FLIGHTPLAN DIFF ALT`	N/A	Altitude between the position of the aircraft and his closest waypoints in the flightplan.	Meters
`ATC FLIGHTPLAN DIFF DISTANCE`	N/A	Returns the lateral distance the user’s plane is from the ATC flight plan track.	Meters
`ATC FLIGHTPLAN DIFF HEADING`	N/A	Heading between the position of the aircraft and his closest waypoints in the flightplan.	Degrees
`ATC FP ARRIVAL TRAFFIC PATTERN IS LEFTHANDED`	N/A	If `TRUE` (1) then the traffic pattern is left handed at arrival, otherwise it is right handed.	Bool
`ATC FP DEPARTURE TRAFFIC PATTERN IS LEFTHANDED`	N/A	If `TRUE` (1) then the traffic pattern is left handed at departure, otherwise it is right handed.	Bool
`ATC FLIGHT NUMBER`	N/A	Flight Number used by ATC, as a string with a maximum number of 6 characters.	String
`ATC FUTURE AGENT DISTANCE`	N/A	Distance to future agent (nm).	Number
`ATC FUTURE AGENT FREQUENCY`	N/A	Frequency of future agent.	Number
`ATC FUTURE AGENT NAME`	N/A	Name of future agent.	String
`ATC FUTURE AGENT TYPE`	N/A	Type of future agent.	Number
`ATC HEAVY`	N/A	Is this aircraft recognized by ATC as heavy.	Bool
`ATC ID`	N/A	ID used by ATC, as a string with a maximum number of 10 characters.	String
`ATC IFR FP TO REQUEST`	N/A	Returns `TRUE` if the user has a valid IFR flight plan they can as for clearance for with ATC at the airport they are currently at.	Bool
`ATC MISSION FP IFR`	N/A	Returns `TRUE` if the mission requires an IFR flight plan.	Bool
`ATC MODEL`	N/A	Model used by ATC, as a string with a maximum number of 128 characters.	String
`ATC NAME`	N/A	Aircraft name used by ATC, as a string with a maximum number of 50 characters.	String
`ATC NEXT WAYPOINT ALTITUDE`	N/A	This will indicate the altitude of the next waypoint of the flightpath.	Meters
`ATC NEXT WAYPOINT NAME`	N/A	The name of the next waypoint assigned by the ATC. Returns “None” if no waypoint is assigned.	String
`ATC ON PARKING SPOT`	N/A	Is ATC aircraft on parking spot.	Bool
`ATC OVERFLYING AIRPORT UNANNOUNCED`	N/A	Is ATC aircraft overflying an airport without announcing themselves.	Bool
`ATC PREVIOUS WAYPOINT ALTITUDE`	N/A	Returns the target altitude for the previous ATC flightplan waypoint.	Meters
`ATC RUNWAY AIRPORT NAME`	N/A	The name of the airport of the runway assigned by the ATC. Returns "" if no runway is assigned.	String
`ATC RUNWAY DISTANCE`	N/A	This float represents the distance between the player’s plane and the center of the runway selected by the ATC.	Meters
`ATC RUNWAY END DISTANCE`	N/A	This is a float corresponding to the horizontal distance between the player’s plane and the end of the runway selected by the ATC.	Meters
`ATC RUNWAY HEADING DEGREES TRUE`	N/A	This float represents the true heading of the runway selected by the ATC.	Degrees
`ATC RUNWAY LENGTH`	N/A	The length of the runway assigned by the ATC. Returns -1 if no runway is assigned.	Meters
`ATC RUNWAY RELATIVE POSITION X`	N/A	This is a float corresponding to the player’s main gear relative X (transverse) position on the runway selected by the ATC.	Meters
`ATC RUNWAY RELATIVE POSITION Y`	N/A	This is a float corresponding to the player’s main gear relative Y (height) position on the runway selected by the ATC.	Meters
`ATC RUNWAY RELATIVE POSITION Z`	N/A	This is a float corresponding to the player’s main gear relative Z (longitudinal) position on the runway selected by the ATC.	Meters
`ATC RUNWAY SELECTED`	N/A	This is a boolean corresponding to whether or not the ATC has pre-selected a runway for the player’s plane. If this is `FALSE`, every other `ATC RUNWAY *` SimVar will return default values.	Bool
`ATC RUNWAY START DISTANCE`	N/A	This is a float corresponding to the horizontal distance between the player’s plane and the start of the runway selected by the ATC.	Meters
`ATC RUNWAY TDPOINT RELATIVE POSITION X`	N/A	This float represents the player’s main gear relative X (transverse) position according to the aiming point of the runway selected by the ATC.	Meters
`ATC RUNWAY TDPOINT RELATIVE POSITION Y`	N/A	This float represents the player’s main gear relative Y (height) position according to the aiming point of the runway selected by the ATC.	Meters
`ATC RUNWAY TDPOINT RELATIVE POSITION Z`	N/A	This float represents the player’s main relative Z (longitudinal) position according to the aiming point of the runway selected by the ATC.	Meters
`ATC RUNWAY WIDTH`	N/A	The width of the runway assigned by the ATC. Returns -1 if no runway is assigned.	Meters
`ATC SUGGESTED MIN RWY LANDING`	N/A	Suggested minimum runway length for landing. Used by ATC.	Feet
`ATC SUGGESTED MIN RWY TAKEOFF`	N/A	Suggested minimum runway length for takeoff. Used by ATC.	Feet
`ATC TAXIPATH DISTANCE`	N/A	Returns the lateral distance the user’s plane is from the path of the currently issued ATC taxi instructions.	Meters
`ATC TYPE`	N/A	Type used by ATC, as a string with a maximum number of 128 characters.	String
`ATC WAYPOINTS HIGHEST ALTITUDE`	N/A	This will indicate the highest altitude from all of the waypoints in the flightpath.	Meters

COM

Simulation Variable	Index	Description	Units
`COM1 STORED FREQUENCY`	N/A	The stored COM 1/2/3 frequency value. The number of COM will depend on how many were defined in the Com.N parameter of the systems.cfg.	Frequency Frequency BCD16
`COM2 STORED FREQUENCY`	N/A	The stored COM 1/2/3 frequency value. The number of COM will depend on how many were defined in the Com.N parameter of the systems.cfg.	Frequency Frequency BCD16
`COM3 STORED FREQUENCY`	N/A	The stored COM 1/2/3 frequency value. The number of COM will depend on how many were defined in the Com.N parameter of the systems.cfg.	Frequency Frequency BCD16
`COM ACTIVE BEARING`	Com Index	Gives the bearing (in degrees) of the active COM station (airport) or a value less than 0 if the station does not belong to an airport. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	Degrees
`COM ACTIVE DISTANCE`	Com Index	Gives the distance (in meters) to the active COM station (airport) or a value less than -180° if the station does not belong to an airport. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	Meters
`COM ACTIVE FREQUENCY`	Com Index	Com frequency. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	Frequency Frequency BCD16
`COM ACTIVE FREQ IDENT`	Com Index	The identity of the station that is tuned on the indexed active COM radio. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	String
`COM ACTIVE FREQ TYPE`	Com Index	The type of COM frequency for the active indexed COM system. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	String:“ATIS” - Atis“UNI” - Unicom“CTAF” - CTAF“GND” - Ground“TWR” - Tower“CLR” - ClearanceDelivery“APPR” - Approach“DEP” - Departure“FSS” - FSS“AWS” - AWOS
`COM ACTIVE LATLONALT`	Com Index	This will return the latitude, longitude and altitude corresponding to the indexed COM station associated with the active COM frequency. If the station is not associated with an airport, then the lat/lon/alt values returned will be `-15943°, 80°, -10000` (this means that you can simply check that the altitude value is greater than 0 to assure the validity of the returned struct).Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	Struct:Struct `struct`
`COM AVAILABLE`	Com Index	`TRUE` if COM1, COM2 or COM3 is available. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	Bool
`COM LATLONALT`	Com Index	Not currently used in the simulation.	Struct:Struct `struct`
`COM RECEIVE`	Com Index	Whether or not the plane is receiving on the indexed com channel or not. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	Bool
`COM RECEIVE ALL`	N/A	Toggles all COM radios to receive on	Bool
`COM RECEIVE EX1`	Com Index	Whether or not the plane is receiving on the indexed com channel. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	Bool
`COM SPACING MODE`	Com Index	The COM radio frequency step. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	Enum:0 = 25kHz1 = 8.33kHz
`COM STANDBY FREQUENCY`	Com Index	Com standby frequency. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	Frequency Frequency BCD16
`COM STANDBY FREQ IDENT`	Com Index	The identity of the station that is tuned on the indexed standby COM radio. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	String
`COM STANDBY FREQ TYPE`	Com Index	The type of COM frequency for the standby indexed COM system. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	String:“ATIS” - Atis“UNI” - Unicom“CTAF” - CTAF“GND” - Ground“TWR” - Tower“CLR” - ClearanceDelivery“APPR” - Approach“DEP” - Departure“FSS” - FSS“AWS” - AWOS>
`COM STATUS`	Com Index	Radio status flag for the indexed com channel. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	Enum:-1 = Invalid0 = OK1 = Does not exist2 = No electricity3 = Failed
`COM TEST`	Com Index	Will return `TRUE` if the COM system is working, `FALSE` otherwise. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	Bool
`COM TRANSMIT`	Com Index	Audio panel transmit status of the indexed COM. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	Bool
`COM VOLUME`	Com Index	The volume of the indexed COM Radio. Index of 1-3, depending on how many were defined in the Com.N parameter of the systems.cfg.	Percent

FLARM

Simulation Variable	Index	Description	Units
`FLARM AVAILABLE`	N/A	Whether the FLARM is available (`TRUE`, 1) or not (`FALSE`, 0).	Bool
`FLARM THREAT BEARING`	N/A	The bearing of the FLARM threat aircraft, relative to track.	Degrees
`FLARM THREAT DATA`	N/A	The FLARM threat aircraft data structure, which contains data about the perceived threat, returned as a struct. Struct member variables are as follows:`id` (U64): the network ID of the intruding plane so that they are remembered in order to compute their trajectory.`bearing` (FLOAT64): The threat bearing, in degrees (this is bearing from track axis and not bearing from the airplane axis).`heading` (FLOAT64): The threat heading.`distance` (FLOAT64): The distance between the aircraft and the threat, in meters.`verticalBearing` (FLOAT64): The vertical bearing between the aircraft and the threat, in degrees.`relativeAltitude` (FLOAT64): The relative altitude of the threat to the aircraft, in meters.`timeToCollision` (FLOAT64): The estimated time to a collision, in seconds.	Struct
`FLARM THREAT DISTANCE`	N/A	The distance to the FLARM threat object.	Meters
`FLARM THREAT HEADING`	N/A	The heading to the FLARM threat object.	Degrees
`FLARM THREAT RELATIVE ALTITUDE`	N/A	The relative altitude of the threat object.	Meters
`FLARM THREAT TIME TO COLLISION`	N/A	The estimated time to a collision.	Seconds
`FLARM THREAT VERTICAL BEARING`	N/A	The vertical bearing towards the threat.	Degrees

GPS

When using these SimVars, it is worth noting that to correctly set those that can be set, you should first use the SimVar GPS OVERRIDEN and set it to TRUE. If you don’t set this SimVar, then any changes that are made to the other GPS variables will be overriden by the simulation GPS system moments after you set them.

Simulation Variable	Index	Description	Units
`GPS APPROACH AIRPORT ID`	N/A	ID of airport.	String
`GPS APPROACH APPROACH ID`	N/A	ID of approach.	String
`GPS APPROACH APPROACH INDEX`	N/A	Index of approach for given airport.	Number
`GPS APPROACH APPROACH TYPE`	N/A	Approach type.	Enum:0 = None1 = GPS2 = VOR3 = NDB4 = ILS5 = Localizer6 = SDF7 = LDA8 = VOR/ DME9 = NDB/ DME10 = RNAV11 = Backcourse
`GPS APPROACH IS FINAL`	N/A	Is approach transition final approach segment.	Bool
`GPS APPROACH IS MISSED`	N/A	Is approach segment missed approach segment.	Bool
`GPS APPROACH IS WP RUNWAY`	N/A	Waypoint is the runway.	Bool
`GPS APPROACH MODE`	N/A	Sub mode within approach mode.	Enum:0 = None1 = Transition2 = Final3 = Missed
`GPS APPROACH SEGMENT TYPE`	N/A	Segment type within approach.	Enum:0 = Line1 = Arc clockwise2 = Arc counter-clockwise
`GPS APPROACH TIMEZONE DEVIATION`	N/A	Deviation of local time from GMT.	Seconds
`GPS APPROACH TRANSITION ID`	N/A	ID of approach transition.	String
`GPS APPROACH TRANSITION INDEX`	N/A	Index of approach transition.	Number
`GPS APPROACH WP COUNT`	N/A	Number of waypoints.	Number
`GPS APPROACH WP INDEX`	N/A	Index of current waypoint.	Number
`GPS APPROACH WP TYPE`	N/A	Waypoint type within approach mode.	Enum:0 = None1 = Fix2 = Procedure turn left3 = Procedure turn right4 = Dme arc left5 = Dme arc right6 = Holding left7 = Holding right8 = Distance9 = Altitude10 = Manual sequence11 = Vector to final
`GPS CDI NEEDLE`	N/A	The course deviation of the needle for a CDI instrument. The SimVar displays the deviation from -127 to +127. It returns a value if a flight plan is set (otherwise it will return 0) even if the autopilot isn’t on GPS mode. Scaling can also be set through the `GPS CDI SCALING` simvar.	Number
`GPS CDI SCALING`	N/A	The full scale deflection of the CDI due to GPS cross-track error, in meters.	Meters
`GPS COURSE TO STEER`	N/A	Suggested heading to steer (for autopilot).	Radians
`GPS DRIVES NAV1`	N/A	GPS is driving Nav 1 indicator. Note this setting will also affect the SimVars `HSI STATION IDENT` and `HSI BEARING`.	Bool
`GPS ETA`	N/A	Estimated time of arrival at destination.	Seconds
`GPS ETE`	N/A	Estimated time en route to destination.	Seconds
`GPS FLIGHTPLAN TOTAL DISTANCE`	N/A	This is the complete flightplan length from start to end. Essentially the cumulative length of all the flight plan legs added together.	Meters
`GPS FLIGHT PLAN WP COUNT`	N/A	Number of waypoints.	Number
`GPS FLIGHT PLAN WP INDEX`	N/A	Index of waypoint.	Number
`GPS GROUND MAGNETIC TRACK`	N/A	Current magnetic ground track.	Radians
`GPS GROUND SPEED`	N/A	Current ground speed.	Meters per second
`GPS GROUND TRUE HEADING`	N/A	Current true heading.	Radians
`GPS GROUND TRUE TRACK`	N/A	Current true ground track.	Radians
`GPS GSI SCALING`	N/A	The full scale deflection of the vertical GSI due to GPS glidepath deviation, in meters.	Meters
`GPS GSI NEEDLE`	N/A	The GPS glideslope needle deflection (+/- 127).	Number
`GPS HAS GLIDEPATH`	N/A	Whether or not the GPS system has a presently available glidepath for guidance. Only applicable with `GPS OVERRIDDEN`. When `TRUE`, `HSI GSI NEEDLE VALID` will also be `TRUE`.	Bool
`GPS HSI NEEDLE`	N/A	The glide deviation of the needle for a CDI instrument. The simvar displays the deviation from -127 to +127. It returns a value if a flight plan is set (otherwise it will return 0) even if the autopilot isn’t on GPS mode. Scaling can also be set through the `GPS CDI SCALING` simvar.	Number
`GPS IS ACTIVE FLIGHT PLAN`	N/A	Flight plan mode active.	Bool
`GPS IS ACTIVE WAY POINT`	N/A	Waypoint mode active.	Bool
`GPS IS ACTIVE WP LOCKED`	N/A	Is switching to next waypoint locked.	Bool
`GPS IS APPROACH ACTIVE`	N/A	Is approach mode active.	Bool
`GPS IS APPROACH LOADED`	N/A	Is approach loaded.	Bool
`GPS IS ARRIVED`	N/A	Is flight plan destination reached.	Bool
`GPS IS DIRECTTO FLIGHTPLAN`	N/A	Is Direct To Waypoint mode active.	Bool
`GPS MAGVAR`	N/A	Current GPS magnetic variation.	Radians
`GPS OBS ACTIVE`	N/A	Whether or not the OBS mode is currently active (disable the automatic sequencing of waypoints in GPS flight plan).	Bool
`GPS OBS VALUE`	N/A	This is the currently selected OBS course in degrees, from 0 to 360.	Degrees
`GPS OVERRIDDEN`	N/A	When it is active, all sim GPS system updates are suspended. This must be set to `TRUE` to be able to correctly set to any other GPS SimVar.	Bool
`GPS POSITION ALT`	N/A	Current GPS altitude.	Meters
`GPS POSITION LAT`	N/A	Current GPS latitude.	Degrees
`GPS POSITION LON`	N/A	Current GPS longitude.	Degrees
`GPS TARGET ALTITUDE`	N/A	Altitude of GPS target.	Meters
`GPS TARGET DISTANCE`	N/A	Distance to target.	Meters
`GPS VERTICAL ANGLE`	N/A	Glidepath in degrees.	Degrees
`GPS VERTICAL ANGLE ERROR`	N/A	Vertical error in degrees from GlidePath.	Degrees
`GPS VERTICAL ERROR`	N/A	Vertical deviation in meters from GlidePath.	Meters
`GPS WP BEARING`	N/A	Magnetic bearing to waypoint.	Radians
`GPS WP CROSS TRK`	N/A	Cross track distance.	Meters
`GPS WP DESIRED TRACK`	N/A	The required heading (magnetic) from the previous waypoint to the next waypoint.	Radians
`GPS WP DISTANCE`	N/A	Distance to waypoint.	Meters
`GPS WP ETA`	N/A	Estimated time of arrival at waypoint.	Seconds
`GPS WP ETE`	N/A	Estimated time en route to waypoint.	Seconds
`GPS WP NEXT ALT`	N/A	Altitude of next waypoint.	Meters
`GPS WP NEXT ID`	N/A	ID of next GPS waypoint.	String
`GPS WP NEXT LAT`	N/A	Latitude of next waypoint.	Degrees
`GPS WP NEXT LON`	N/A	Longitude of next waypoint.	Degrees
`GPS WP PREV ALT`	N/A	Altitude of previous waypoint.	Meters
`GPS WP PREV ID`	N/A	ID of previous GPS waypoint.	String
`GPS WP PREV LAT`	N/A	Latitude of previous waypoint.	Degrees
`GPS WP PREV LON`	N/A	Longitude of previous waypoint.	Degrees
`GPS WP PREV VALID`	N/A	Is previous waypoint valid (i.e. current waypoint is not the first waypoint).	Bool
`GPS WP TRACK ANGLE ERROR`	N/A	Tracking angle error to waypoint.	Radians
`GPS WP TRUE BEARING`	N/A	True bearing to waypoint.	Radians
`GPS WP TRUE REQ HDG`	N/A	Required true heading to waypoint.	Radians
`GPS WP VERTICAL SPEED`	N/A	Vertical speed to waypoint.	Meters per second

HSI

Simulation Variable	Index	Description	Units
`HSI BEARING`	N/A	If the `GPS DRIVES NAV1` variable is `TRUE` and the `HSI BEARING VALID` variable is `TRUE`, this variable contains the HSI needle bearing. If the `GPS DRIVES NAV1` variable is `FALSE` and the `HSI BEARING VALID` variable is `TRUE`, this variable contains the ADF1 frequency.	Degrees
`HSI BEARING VALID`	N/A	This will return `TRUE` if the `HSI BEARING` variable contains valid data.	Bool
`HSI CDI NEEDLE`	N/A	Needle deflection (+/- 127).	Number
`HSI CDI NEEDLE VALID`	N/A	Signal valid.	Bool
`HSI DISTANCE`	N/A	DME/GPS distance.	Nautical miles
`HSI GSI NEEDLE`	N/A	Needle deflection (+/- 119).	Number
`HSI GSI NEEDLE VALID`	N/A	Signal valid.	Bool
`HSI HAS LOCALIZER`	N/A	Station is a localizer.	Bool
`HSI SPEED`	N/A	DME/GPS speed.	Knots
`HSI STATION IDENT`	N/A	Returns the ident of the the next GPS waypoint, if `GPS DRIVES NAV1` is `TRUE`. If `GPS DRIVES NAV1` is `FALSE`, it returns the identity of the station that is tuned on nav radio 1.	String
`HSI TF FLAGS`	N/A	Nav TO/FROM flag.	Enum:0 = Off1 = TO2 = FROM

MARKERS

These SimVars are only valid if a Marker.N has been defined in the systems.cfg. Note that more than 1 marker is not currently supported by the simulation.

Simulation Variable	Index	Description	Units
`INNER MARKER`	N/A	Inner marker state.	Bool
`INNER MARKER LATLONALT`	N/A	Returns the latitude, longitude and altitude of the inner marker of an approach to a runway, if the aircraft is within the required proximity, otherwise it will return zeros.	Struct `struct`structure
`MARKER AVAILABLE`	N/A	`TRUE` if Marker is available.	Bool
`MARKER BEACON SENSITIVITY HIGH`	N/A	Whether or not the Marker Beacon is in High Sensitivity mode.	Bool
`MARKER BEACON STATE`	N/A	Marker beacon state.	Enum:0 = None1 = Outer2 = Middle3 = Inner
`MARKER BEACON TEST MUTE`	N/A	Whether or not the Marker Beacon is in Test/Mute mode.	Bool
`MARKER SOUND`	N/A	Marker audio flag.	Bool
`MIDDLE MARKER`	N/A	Middle marker state.	Bool
`MIDDLE MARKER LATLONALT`	N/A	Returns the latitude, longitude and altitude of the middle marker.	Struct `struct`structure
`OUTER MARKER`	N/A	Outer marker state.	Bool
`OUTER MARKER LATLONALT`	N/A	Returns the latitude, longitude and altitude of the outer marker.	Struct `struct`structure

NAV

Simulation Variable	Index	Description	Units
`NAV ACTIVE FREQUENCY`	Navigation Index	Nav active frequency. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.	MHz
`NAV AVAILABLE`	Navigation Index	Flag if indexed Nav equipped on aircraft. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.	Bool
`NAV BACK COURSE FLAGS`	Navigation Index	Returns the listed bit flags. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.	Flags:BIT3: station activeBIT2: on courseBIT1: localizer tuned inBIT0: back course available
`NAV CDI`	Navigation Index	CDI needle deflection (+/- 127). Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.	Number
`NAV CLOSE DME`	Navigation Index	Closest DME distance. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.Note that this SimVar will only work if the `NAV1 CLOSE FREQ SET` key event has been set to 1 (`TRUE`).	Nautical miles
`NAV CLOSE FREQUENCY`	Navigation Index	Closest localizer course frequency. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.Note that this SimVar will only work if the `NAV1 CLOSE FREQ SET` key event has been set to 1 (`TRUE`).	Hz
`NAV CLOSE IDENT`	Navigation Index	Closest ICAO code identity. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.Note that this SimVar will only work if the `NAV1 CLOSE FREQ SET` key event has been set to 1 (`TRUE`).	String
`NAV CLOSE LOCALIZER`	Navigation Index	Closest localizer course heading. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.Note that this SimVar will only work if the `NAV1 CLOSE FREQ SET` key event has been set to 1 (`TRUE`).	Degrees
`NAV CLOSE NAME`	Navigation Index	Descriptive name. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.Note that this SimVar will only work if the `NAV1 CLOSE FREQ SET` key event has been set to 1 (`TRUE`).	String
`NAV CODES`	Navigation Index	Returns bit flags with the listed meaning. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.	Flags:BIT7: VOR LocalizerBIT6: glideslope availableBIT5: no localizer backcourseBIT4: DME transmitter at glide slope transmitterBIT3: no nav signal availableBIT2: voice availableBIT1: TACAN availableBIT0: DME available
`NAV DME`	N/A	DME distance.	Nautical miles
`NAV DMESPEED`	N/A	DME speed.	Knots
`NAV DME LATLONALT`	N/A	Returns the DME station.	Struct `struct` structure
`NAV FREQUENCY`	N/A	Localizer course frequency.	Hz
`NAV GLIDE SLOPE`	N/A	The glide slope gradient. The value returned is an integer value formed as follows:`sin(slope) 65536 2`So, for example, a glide slope of 2.7º would return a value of 6174. TO get the value in degrees, then use `NAV RAW GLIDE SLOPE` instead.	Number
`NAV GLIDE SLOPE ERROR`	N/A	Difference between current position and glideslope angle. Note that this provides 32 bit floating point precision, rather than the 8 bit integer precision of NAV GSI.	Degrees
`NAV GLIDE SLOPE LENGTH`	N/A	The distance between the plane and the Glide beacon.	Feet
`NAV GSI`	Navigation Index	Glideslope needle deflection (+/- 119). Note that this provides only 8 bit precision, whereas `NAV GLIDE SLOPE ERROR` provides 32 bit floating point precision. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.	Number
`NAV GS FLAG`	Navigation Index	Glideslope flag. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.	Bool
`NAV GS LATLONALT`	N/A	Returns the glide slope.	Struct `struct` structure
`NAV GS LLAF64`	N/A	Nav GS latitude, longitude, altitude.	Struct `struct` structure
`NAV HAS CLOSE DME`	N/A	Flag if found a close station with a DME.	Bool
`NAV HAS CLOSE LOCALIZER`	N/A	Flag if found a close localizer station.	Bool
`NAV HAS DME`	N/A	Flag if tuned station has a DME.	Bool
`NAV HAS GLIDE SLOPE`	N/A	Flag if tuned station has a glideslope.	Bool
`NAV HAS LOCALIZER`	N/A	Flag if tuned station is a localizer.	Bool
`NAV HAS NAV`	N/A	Flag if Nav has signal.	Bool
`NAV HAS TACAN`	N/A	Flag if Nav has a Tacan.	Bool
`NAV IDENT`	N/A	ICAO code.	String
`NAV LOCALIZER`	N/A	Localizer course heading.	Degrees
`NAV LOC AIRPORT IDENT`	N/A	The airport ICAO ident for the localizer that is currently tuned on the nav radio (like ‘EGLL’ or ‘KJFK’)	String
`NAV LOC RUNWAY DESIGNATOR`	N/A	The letter code for the runway that the currently tuned localizer is tuned to.	String‘L’ - Left‘R’ - Right‘C’ - Center‘W’ - Water‘A’ - A‘B’ - B
`NAV LOC RUNWAY NUMBER`	N/A	NAV LOC RUNWAY NUMBER - The number portion of the runway that the currently tuned localizer is tuned to (so if the runway was 15L, this would be 15).	String‘1’ - ‘36’‘N’‘NE’‘E’‘SE’‘S’‘SW’‘W’‘NW’
`NAV MAGVAR`	Navigation Index	Magnetic variation of tuned Nav station. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.	Degrees
`NAV NAME`	Navigation Index	Descriptive name. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.	String
`NAV OBS`	Navigation Index	OBS setting. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.	Degrees
`NAV RADIAL`	Navigation Index	Radial that aircraft is on. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.	Degrees
`NAV RADIAL ERROR`	N/A	Difference between current radial and OBS tuned radial.	Degrees
`NAV RAW GLIDE SLOPE`	N/A	The glide slope angle.	Degrees
`NAV RELATIVE BEARING TO STATION`	N/A	Relative bearing to station.	Degrees
`NAV SIGNAL`	N/A	Nav signal strength.	Number
`NAV SOUND`	Navigation Index	Nav audio flag. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.	Bool
`NAV STANDBY FREQUENCY`	Navigation Index	Nav standby frequency. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.	MHz
`NAV TOFROM`	N/A	Returns whether the Nav is going to or from the current radial (or is off).	Enum:0 = Off1 = TO2 = FROM
`NAV VOLUME`	N/A	The volume of the Nav radio.	Percent
`NAV VOR DISTANCE`	N/A	Distance of the VOR beacon.	Meters
`NAV VOR LATLONALT`	Navigation Index	Returns the VOR station latitude, longitude and altitude. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.	Struct `struct` structure
`NAV VOR LLAF64`	Navigation Index	Nav VOR latitude, longitude, altitude. Index of 1-4, depending on how many were defined in the Nav.N parameter of the systems.cfg.	Struct `struct` structure

TACAN

The table below lists all the SimVars related to the Tacan system on an aircraft. You can have either 1 or 2 of these systems, and in so all these SimVars require an index value of 1 or 2, depending on which one you want to target. Note that you must have first enabled the Tacan using the Tacan.N parameter in the systems.cfg file.

Simulation Variable	Index	Description	Units
`TACAN ACTIVE CHANNEL`	Tacan Index	The active channel used by the indexed Tacan receiver on the aircraft, from 1 to 127. Index of 1 or 2, depending on how many were defined in the Tacan.N parameter of the systems.cfg.	Number
`TACAN ACTIVE MODE`	N/A	The active mode used by the indexed Tacan receiver on the aircraft, where 0 = X and 1 = Y. Index of 1 or 2, depending on how many were defined in the Tacan.N parameter of the systems.cfg.	Bool
`TACAN AVAILABLE`	Tacan Index	Will be `TRUE` (1) if NAV1, NAV2, NAV3 or NAV4 can receive the indexed Tacan, or `FALSE` (0) otherwise. Index of 1 or 2, depending on how many were defined in the Tacan.N parameter of the systems.cfg.	Bool
`TACAN DRIVES NAV1`	Tacan Index	Tells whether the indexed Tacan is driving the Nav 1 indicator (`TRUE`, 1) or not (`FALSE`, 0), for autopilot purposes. Index of 1 or 2, depending on how many were defined in the Tacan.N parameter of the systems.cfg.	Bool
`TACAN OBS`	Tacan Index	The indexed Tacan OBS setting, in degrees. Index of 1 or 2, depending on how many were defined in the Tacan.N parameter of the systems.cfg.	Degrees
`TACAN STANDBY CHANNEL`	Tacan Index	The standby channel used by the indexed Tacan receiver on the aircraft, from 1 to 127. Index of 1 or 2, depending on how many were defined in the Tacan.N parameter of the systems.cfg.	Number
`TACAN STANDBY MODE`	Tacan Index	Indicates the indexed Tacan receiver standby mode, where 0 = X and 1 = Y. Index of 1 or 2, depending on how many were defined in the Tacan.N parameter of the systems.cfg.	Bool
`TACAN STATION CDI`	Tacan Index	The CDI needle deflection amount (course deviation) to the indexed Tacan station. Can be +/- 127. Index of 1 or 2, depending on how many were defined in the Tacan.N parameter of the systems.cfg.	Number
`TACAN STATION DISTANCE`	Tacan Index	The distance between the indexed Tacan station position and the aircraft position. The index value refers to the Tacan receiver connected to the station. Index of 1 or 2, depending on how many were defined in the Tacan.N parameter of the systems.cfg.	Meter
`TACAN STATION IDENT`	Tacan Index	The tuned station identifier for the indexed Tacan. Index of 1 or 2, depending on how many were defined in the Tacan.N parameter of the systems.cfg.	String
`TACAN STATION LATLONALT`	Tacan Index	Retrieves the latitude, longitude and altitude of the indexed Tacan station. Index of 1 or 2, depending on how many were defined in the Tacan.N parameter of the systems.cfg.	Struct `struct`structure
`TACAN STATION RADIAL`	Tacan Index	The radial between the indexed Tacan station and the aircraft. Index of 1 or 2, depending on how many were defined in the Tacan.N parameter of the systems.cfg.	Degrees
`TACAN STATION RADIAL ERROR`	Tacan Index	Difference between the current radial and OBS tuned radial of the indexed Tacan station, in degrees. Index of 1 or 2, depending on how many were defined in the Tacan.N parameter of the systems.cfg.	Degrees.
`TACAN STATION TOFROM`	Tacan Index	Returns whether the indexed Tacan is going to or from the current radial (or is off). Index of 1 or 2, depending on how many were defined in the Tacan.N parameter of the systems.cfg.	Enum:0 = Off1 = TO2 = FROM
`TACAN VOLUME`	Tacan Index	The volume value of the indexed Tacan receiver on the aircraft. Index of 1 or 2, depending on how many were defined in the Tacan.N parameter of the systems.cfg.	Percent Over 100

TCAS

Simulation Variable	Index	Description	Units
`TCAS INTRUDER BEARING`	N/A	The bearing of TCAS intruder aircraft.	Degrees
`TCAS INTRUDER DATA`	N/A	The TCAS intruder aircraft data structure, which contains data about the perceived threat, returned as a struct. Struct member variables are as follows:`id` (U64): the network ID of the intruding plane so that they are remembered in order to compute their trajectory.`bearing` (FLOAT64): The intruder bearing, in degrees (this is bearing from track axis and not bearing from the airplane axis).`distance` (FLOAT64): The distance between the aircraft and the intruder, in meters.`verticalSpeed` (FLOAT64): The vertical speed of the intruder aircraft.`relativeAltitude` (FLOAT64): The relative altitude of the intruder compared to the aircraft, in meters.`relativeSpeed` (Vec3): The relative speed of the intruder compared to the aircraft, in ft per second, on the x, y, and z axis.	Struct
`TCAS INTRUDER DISTANCE`	N/A	Disatance of TCAS intruder aircraft.	nm
`TCAS INTRUDER NETWORK ID`	N/A	Network ID of TCAS intruder aircraft.	Number
`TCAS INTRUDER RELATIVE ALTITUDE`	N/A	Relative Altitude of TCAS intruder aircraft.	ft
`TCAS INTRUDER RELATIVE SPEED`	N/A	Relative Speed of TCAS intruder aircraft.	`SIMCONNECT_DATA_XYZ` struct, miles per second.
`TCAS INTRUDER VERTICAL SPEED`	N/A	Vertical Speed of TCAS intruder aircraft	ft per second
`TCAS MODE`	N/A	The current TCAS mode.	Integer:0: STBY (OFF)1: XPNDR2:TA ONLY3: AUTO (TA_RA)
`TCAS RECEIVED RESOLUTION ADVISORY`	N/A	Received RAs from intruders.	Number
`TCAS SEND RESOLUTION ADVISORY`	N/A	RAs to send to intruders, settable if external TCAS is defined.	Number

Misc.

Simulation Variable	Index	Description	Units
`COPILOT TRANSMITTER TYPE`	N/A	On which channel the copilot is transmitting.	Enum:0 = COM11 = COM22 = COM33 = TEL4 = NONE
`COPILOT TRANSMITTING`	N/A	Whether or not the copilot is transmitting.	Bool
`PILOT TRANSMITTER TYPE`	N/A	On which channel the pilot is transmitting.	Enum:0 = COM11 = COM22 = COM33 = TEL4 = NONE
`PILOT TRANSMITTING`	N/A	Whether or not the pilot is transmitting.	Bool
`RADIOS AVAILABLE`	N/A	Currently not used within the simulation.	-
`RADIO HEIGHT`	N/A	Radar altitude.	Feet
`TRANSPONDER AVAILABLE`	N/A	`TRUE` if a transponder is available.	Bool
`TRANSPONDER CODE`	Transponder Index	4-digit code. Index should always be 1 and it needs to have been created in the Transponder.N parameter of the systems.cfg. More than 1 transponder is not currently supported by the simulation.	Bco16
`TRANSPONDER IDENT`	Transponder Index	This can set the Ident transponder using the `XPNDR_IDENT_SET`, `XPNDR_IDENT_TOGGLE`, `XPNDR_IDENT_ON` or `XPNDR_IDENT_OFF` Event IDs (see XPNDR (Transponder) section for more information). When set to `TRUE`, it will automatically turn `FALSE` after 18 seconds. Index should always be 1 and it needs to have been created in the Transponder.N parameter of the systems.cfg. More than 1 transponder is not currently supported by the simulation.	Bool
`TRANSPONDER STATE`	Transponder Index	The indexed transponder State. Index should always be 1 and it needs to have been created in the Transponder.N parameter of the systems.cfg. More than 1 transponder is not currently supported by the simulation.	Enum:0 = Off1 = Standby2 = Test3 = On4 = Alt5 = Ground

Aircraft Miscellaneous Variables

Aircraft System Variables

Flighting

SDK Documentation

Aircraft Radio Navigation Variables

ADF

ATC

COM

FLARM

GPS

HSI

MARKERS

NAV

TACAN

TCAS

Misc.

Aircraft Radio Navigation Variables

ADF#

ATC#

COM#

FLARM#

GPS#

HSI#

MARKERS#

NAV#

TACAN#

TCAS#

Misc.#

ADF

ATC

COM

FLARM

GPS

HSI

MARKERS

NAV

TACAN

TCAS

Misc.