Crux EFIS by Gardner Avionics

A complete glass cockpit for your homebuilt.

A dedicated Flight Data Computer does the sensing. The iPad you already own becomes the display.

Interest list opening soon See what it does

For experimental and amateur-built aircraft.

Everything the panel needs, split the right way

The sensing, state estimation and aircraft integration live in a dedicated Flight Data Computer. The iPad does what it does best: a bright, familiar display.

Synthetic vision

A 3D view of the terrain ahead, drawn behind the attitude display, with runways, taxiways and aprons in place. Choose terrain-clearance colouring, satellite imagery or a hybrid of both. Terrain and airport data live on the iPad, so terrain works with no internet.

Primary flight display on the iPad

Attitude, airspeed and altitude tapes, heading and vertical speed on a bright, high-resolution native iPad app. Not a web page and not a remote screen: a real instrument on hardware you already know.

Custom Flight Data Computer

Purpose-built hardware running custom firmware and a custom extended Kalman filter for attitude and air data. Triple-redundant inertial sensors and dual barometers are continuously cross-checked, so a failing sensor is voted out instead of reaching your display.

Radio voice-to-text

Radio calls are transcribed live on the iPad as you hear them, so a missed clearance is there to read back. Speech recognition runs on the device, with no internet needed.

Transcription runs in the app today. The audio link from the radio is in development.

Com radio on the screen

Integrates with the MGL V16 com radio over CAN. Tune frequencies and see radio status right on the iPad.

Moving map

A satellite or hybrid map that follows the aircraft, with airport layouts drawn in. Track-up or north-up.

GPS heading, no magnetometer

Two GPS receivers measure heading from the baseline between their antennas. There is no magnetometer to calibrate, and no interference from the engine or wiring.

Works with your EFB

Standard GDL90 over WiFi feeds your EFB with no extra software, including attitude into OzRunways via the AHRS extension. Your charts and these instruments, side by side.

High-speed CAN bus network

GPS and airspeed sensors connect over a high-speed CAN bus network. Fewer wires, sensors mounted where they belong, and a network built to grow with your panel.

QNH altimetry with METAR

Altitude is QNH-aware throughout. When the iPad has internet, it fetches the local QNH from the nearest METAR automatically.

SouthPAN SBAS

The GPS receivers use SouthPAN satellite-based augmentation for better accuracy across Australia and New Zealand.

Lifetime clock

A power-on hours counter that survives power loss, shown on the display.

One box, one stream, every screen

The Flight Data Computer sends a single GDL90 stream over WiFi. The native app and your EFB both read it, so there is nothing extra to install on the EFB side.

SensorsGPS and airspeed on a high-speed CAN bus
Flight Data ComputerCustom firmware, custom EKF, redundant sensors
GDL90 over WiFiOne stream for every display
iPad + your EFBNative display app, OzRunways and other GDL90 apps
Gardner Avionics

Built by a builder

Gardner Avionics is Kyle Gardner's company, and Crux EFIS is being built for Kyle's own homebuilt aircraft. It is designed by a builder who wants the same things from a panel that you do: clear instruments, honest engineering and hardware that makes sense in an experimental aircraft.

Roadmap

What's coming

These are on the roadmap. None of them is part of the product today.

In development

AI copilot

AI features that read Flight Data Computer data on the iPad: a voice copilot, engine-anomaly detection and a flight advisor.

In development

Autopilot

Heading and altitude targets set on the iPad, flown through MGL servos. The on-screen autopilot panel is built; the servo drive is not yet.

In development

Flight recorder

Every piece of flight data recorded on the iPad, with replay after the flight.

In development

Alerts in your headset

Audio alerts and voice callouts from the iPad played through the intercom.

Planned

Engine monitoring

Engine data from an MGL RDAC on the iPad.

Planned

ADS-B traffic

Nearby traffic shown on the display.

Planned

Weather overlay

Weather layered over the map.

Planned

Angle of attack

Angle of attack from a second airspeed and static sensor.

Planned

Electronic circuit breakers

MGL ECB circuit-breaker control from the iPad.

Planned

Thermal camera

A live thermal or infrared camera feed on the iPad, for night and haze.

Planned

Live checklists

Interactive checklists on the display.

Planned

Aircraft profiles

Display setups saved per aircraft.

Planned

iPad heat watch

Watches the iPad's temperature and battery on a hot glareshield, and eases the graphics load before it overheats.

From the workshop

Recent engineering milestones, drawn straight from the development history.

Commits
93
Automated test suites
22
Last update
6 Nov 2026

In development since 10 Aug 2026.

  1. Rebrand to Gardner Avionics EFIS: app icon, lockup, display name
  2. Send magnetic variation in EFIS_NAV from an on-board WMM2025 model
  3. Add EFIS_GNSS_STATUS (0x7D): per-receiver GNSS diagnostics downlink
  4. Send true heading in the GDL90 stream once GPS heading aids the EKF
  5. Use realistic asphalt/concrete tints for airport overlays
  6. Render X-Plane airports in synthetic vision + moving map
  7. Add a slide-in settings drawer (menu-system shell)
  8. Integrate the MGL V16 COM radio on the CAN2 MGL bus
  9. Add sensor voting: 3-way IMU vote, 2-way baro cross-check
  10. Add the ICM-20602 driver — third IMU sampled

Building a panel?

Be first to hear when Crux EFIS opens to other builders.

Interest list opening soon