Skip to content

Garmin GTX-345 Integration

The Garmin GTX-345 is a panel-mounted ADS-B In/Out transponder that broadcasts traffic and weather to portable devices over Wi-Fi using the same GDL90 protocol as Stratux. AZSuite Mobile is a fully-supported client.

Setup

GTX-345's Wi-Fi setup is done in the panel:

  1. Power on the GTX-345 and let it boot
  2. The unit broadcasts a Wi-Fi network — typically named after the unit's serial or a configurable label
  3. Connect your phone to that network
  4. Open the AZSuite mobile app
  5. The ADS-B Receiver tile starts receiving frames

Identical to Stratux from AZSuite's perspective — no AZSuite-specific configuration.

Differences from Stratux

The GTX-345 has a few traits worth knowing:

Trait Stratux GTX-345
Power source External battery / aircraft power Aircraft power only
GPS Built-in (single antenna) Aircraft's GPS source (typically a GTN/GNS)
Wi-Fi range ~10 ft ~30 ft (panel-mounted antenna position)
Cost DIY ~$200 Installed ~$5K+
Cabin presence A box on glareshield Invisible (panel-mounted)
Multiple clients Yes Up to 2 simultaneous (firmware-dependent)

The 2-client limit on GTX-345 means if you have your iPad on ForeFlight and your phone on AZSuite both connected, that's the cap. Adding a third client may bump one of the others off.

Frame format

GTX-345 sends:

  • Heartbeat (msg ID 0)
  • Ownship (msg ID 10) — uses the aircraft's panel GPS (more accurate than Stratux's puck)
  • Ownship Geometric Altitude (msg ID 11)
  • Traffic (msg ID 20)
  • Uplink Data (msg ID 7) — FIS-B
  • Foreflight-specific extension messages (rare; AZSuite ignores them)

Identical to Stratux. The only practical difference: the GTX-345's altitude data is more accurate because it uses the aircraft's certified GPS source.

Common gotcha: GTX-345 vs GTX-335

There are two similar Garmin units:

  • GTX-345: ADS-B In + Out — broadcasts traffic / weather to your phone
  • GTX-335: ADS-B Out only — does NOT broadcast to your phone

If your panel has a GTX-335, AZSuite mobile won't see anything from it (there's nothing to see — the unit only transmits to ATC, not to in-cabin clients). You'd need a separate ADS-B In source like a Stratux.

Troubleshooting

Symptom Likely cause Fix
AZSuite sees no frames Connected to a different Wi-Fi (typically your phone's autoconnect to a hotspot) Verify the GTX-345's SSID in Wi-Fi settings
Two iPads connected, third device gets nothing 2-client limit Disconnect one of the others
Wi-Fi drops mid-flight Panel reboot, electrical noise Verify good ground / clean power; reposition iPad if interference
FIS-B works but no traffic No nearby ADS-B-Out aircraft (rare in CONUS) Verify on the GTX-345 panel — does IT see traffic?

Multiple-aircraft clubs

If you fly several aircraft each with a GTX-345, AZSuite re-detects the new Wi-Fi network each time you switch aircraft. There's nothing to re-configure on AZSuite's side — just connect your phone to the new aircraft's GTX-345 Wi-Fi when you climb in.