KX 125-style NAV/COM

A classic NAV/COM in the style of the Bendix/King KX 125, with three amber backlit LCD windows: COMM active over standby, a NAV information window with its CDI (or bearing / radial), and NAV active over standby. PULL OBS lets the NAV knob set the course. Comes as NAV/COM 1 or NAV/COM 2.

Modeled on: Bendix/King KX 125-style NAV/COM
Category: Radios and panels
Size: 2 × 1 cells
Version: 1.0 · 2026-10-19
Plan: Pro
Simulators: MSFS 2020 · MSFS 2024 · X-Plane 11 · X-Plane 12

Variants

NAV/COM 1v1.0

Tunes and shows COM 1 / NAV 1 and its course

Picker: RADIO > NAV/COM 1

NAV/COM 2v1.0

Tunes and shows COM 2 / NAV 2 and its course

Picker: RADIO > NAV/COM 2

Features

Amber backlit LCD windows with seven-segment digits and faint unlit segments
COMM window: active over standby, TX while transmitting on this COM
NAV window: CDI with five dots each side and the needle, OBS and the course, TO / FR, FLAG without a valid signal
MODE: the bearing to the station (BRG) or the radial from it (RAD) in large digits, from the VOR's position
NAV window: active over standby
Transfer (SBY) keys at each end swap COMM and NAV
LCD windows dim with the panel lights and go dark without avionics power; faceplate under the red flood light at night

On the iPad

Drag the COMM dual knob: outer MHz, inner channel
Drag the NAV dual knob: outer MHz, inner channel
Tap the NAV dual knob (PULL OBS) so the inner knob sets the course; tap again to go back to tuning
Tap the left / right SBY transfer key to swap COMM / NAV active and standby
Tap MODE to cycle the NAV window: CDI, BRG, RAD
Tap the small NAV knob (PULL IDENT) to toggle the NAV ident audio

Settings

Which radio: NAV/COM 1 or NAV/COM 2 (picker variant)

Keys and controllers

Map any of these to a key, a game controller's button or axis, or a MIDI knob (how):

COM 1 MHz +
COM 1 MHz -
COM 1 channel +
COM 1 channel -
COM 1 swap
NAV 1 MHz +
NAV 1 MHz -
NAV 1 channel +
NAV 1 channel -
NAV 1 swap

Simulator data

What the Hub reads from the simulator for this instrument, and what the instrument sends back. Names are the simulators' own: MSFS SimVars and events, X-Plane datarefs and commands.

Reads

Value	MSFS	X-Plane
COM1 active frequency (kHz)	`COM ACTIVE FREQUENCY:1 (MHz)`	`sim/cockpit2/radios/actuators/com1_frequency_hz_833`
COM1 standby frequency (kHz)	`COM STANDBY FREQUENCY:1 (MHz)`	`sim/cockpit2/radios/actuators/com1_standby_frequency_hz_833`
COM2 active frequency (kHz)	`COM ACTIVE FREQUENCY:2 (MHz)`	`sim/cockpit2/radios/actuators/com2_frequency_hz_833`
COM2 standby frequency (kHz)	`COM STANDBY FREQUENCY:2 (MHz)`	`sim/cockpit2/radios/actuators/com2_standby_frequency_hz_833`
NAV1 active frequency (kHz)	`NAV ACTIVE FREQUENCY:1 (MHz)`	`sim/cockpit2/radios/actuators/nav1_frequency_hz`
NAV1 standby frequency (kHz)	`NAV STANDBY FREQUENCY:1 (MHz)`	`sim/cockpit2/radios/actuators/nav1_standby_frequency_hz`
NAV2 active frequency (kHz)	`NAV ACTIVE FREQUENCY:2 (MHz)`	`sim/cockpit2/radios/actuators/nav2_frequency_hz`
NAV2 standby frequency (kHz)	`NAV STANDBY FREQUENCY:2 (MHz)`	`sim/cockpit2/radios/actuators/nav2_standby_frequency_hz`
COM transmitting: 1, 2, 0 none (enum)	`COM TRANSMIT:1 (bool)COM TRANSMIT:2 (bool)`	`sim/cockpit2/radios/actuators/audio_com_selection`
NAV1 receiver course deviation, + = course right (dots (-2.5..2.5))	`NAV CDI:1 (number)`	`sim/cockpit2/radios/indicators/nav1_hdef_dots_pilot`
NAV1 TO/FROM: 0 off, 1 TO, 2 FROM (enum)	`NAV TOFROM:1 (enum)`	`sim/cockpit2/radios/indicators/nav1_flag_from_to_pilot`
NAV1 receiving a station (1/0) (bool)	`NAV HAS NAV:1 (bool)`	`sim/cockpit2/radios/indicators/nav1_flag_from_to_pilot`
NAV1 OBS course (deg)	`NAV OBS:1 (degrees)`	`sim/cockpit2/radios/actuators/nav1_obs_deg_mag_pilot`
NAV2 receiver course deviation, + = course right (dots (-2.5..2.5))	`NAV CDI:2 (number)`	`sim/cockpit2/radios/indicators/nav2_hdef_dots_pilot`
NAV2 TO/FROM: 0 off, 1 TO, 2 FROM (enum)	`NAV TOFROM:2 (enum)`	`sim/cockpit2/radios/indicators/nav2_flag_from_to_pilot`
NAV2 receiving a station (1/0) (bool)	`NAV HAS NAV:2 (bool)`	`sim/cockpit2/radios/indicators/nav2_flag_from_to_pilot`
NAV2 OBS course (deg)	`NAV OBS:2 (degrees)`	`sim/cockpit2/radios/actuators/nav2_obs_deg_mag_pilot`
Aircraft latitude (deg)	`PLANE LATITUDE (degrees)`	`sim/flightmodel/position/latitude`
Aircraft longitude (deg)	`PLANE LONGITUDE (degrees)`	`sim/flightmodel/position/longitude`
Magnetic variation, + east (magnetic = true - variation) (deg)	`MAGVAR (degrees)`	`sim/flightmodel/position/magnetic_variation`

Sends

When you…	MSFS	X-Plane
COMM knob (com1 MHz, com1 + 1 channel), left transfer key (com1 + 2); com2 on NAV/COM 2	`COM_STBY_RADIO_SET_HZCOM_STBY_RADIO_SWAP`	`sim/cockpit2/radios/actuators/com1_standby_frequency_hz_833sim/radios/com1_standy_flip`
NAV knob, right transfer key; nav2 on NAV/COM 2	`NAV1_STBY_SET_HZNAV1_RADIO_SWAP`	`sim/cockpit2/radios/actuators/nav1_standby_frequency_hzsim/radios/nav1_standy_flip`
Inner NAV knob in OBS mode (NAV/COM 1); crs2 on NAV/COM 2	`VOR1_SET`	`sim/cockpit2/radios/actuators/nav1_obs_deg_mag_pilotsim/cockpit2/radios/actuators/hsi_obs_deg_mag_pilot (also, when HSI_source_select_pilot == 0)`
PULL IDENT knob tapped (NAV 1 / NAV 2 audio bit)	`RADIO_VOR1_IDENT_TOGGLERADIO_VOR2_IDENT_TOGGLERADIO_DME1_IDENT_TOGGLERADIO_ADF_IDENT_TOGGLEMARKER_SOUND_TOGGLETOGGLE_SPEAKER`	`sim/cockpit2/radios/actuators/audio_selection_nav1sim/cockpit2/radios/actuators/audio_selection_nav2sim/cockpit2/radios/actuators/audio_dme_enabledsim/cockpit2/radios/actuators/audio_selection_adf1sim/cockpit2/radios/actuators/audio_marker_enabled`