Garmin GTX 345
The Garmin GTX 345 is IFR-certified and looks and operates like a standard Mode S transponder. It fits in the same 1.65-inch high slot in your avionics stack. It boasts a bright, sunlight-readable digital display, a pressure altitude readout, handy timers for approaches and other operations, plus dedicated pushbuttons numbered 0-9 for quick and easy squawk code entry. But where other transponders leave off, the GTX 345 is just getting started. The addition of 1090 MHz ADS-B “Out” transmission capability (using precise GPS-referenced positioning information) enables the transponder to automatically output the more accurate, more dynamic traffic surveillance data that the NextGen airspace system requires. Plus, available ADS-B “In” reception unlocks even more capabilities for pilots, enabling them to display ADS-B traffic, weather and more on a variety of installed or portable displays.
- 1090 MHz ADS-B “Out” enables aircraft to operate at any altitude, in airspace around the globe
- Combines Mode S Extended Squitter (ES) transponder and optional WAAS/GPS position source in a single unit
- Provides access to dual-link ADS-B “In” traffic and subscription-free weather on compatible displays
- Wirelessly stream weather, traffic, GPS position and backup attitude via Connext® link to Garmin Pilot™ and ForeFlight Mobile apps as well as the aera® 795/796 portables
- Easy replacement for your existing transponder, with common 1.65-inch tall form factor
For nearly 20 years, Garmin has led the development and initial deployment of various ADS-B projects including Capstone, and today we have optimized that experience to unveil the industry’s best ADS-B solutions, now including the Garmin GTX 345 and GTX 335 ADS-B transponders.


- Physical dimensions (unit, rack, connectors); for panel mounts, depth is measured from face of instrument panel): 1.65” x 6.30” x 10.07” (42 x 160 x 256 mm)
- Display type: Digital
- Weight (unit, rack, connectors): 3.1/3.2 lbs (1.41/1.45 kg)
- Voltage range: 14/28 VDC (18/20 W Max)
- Transmit power: 200 W minimum
- Temperature: -40° C to +70° C
- Operating altitude: To 55,000 ft (16,800 m)
- Cooling input: Not required
- Environmental compliance (TSO Approved): DO-160G
- Software compliance (TSO Approved): DO-178 Levels B, C, D, E
- Hardware compliance (TSO Approved): DO-254 Level C
- TSO compliance (Approved): TSO-C88b (w/opt. alt. encoder; TSO-C112e (Class 1, Level 2els; TSO-C154c (Class A1S); TSO-C157a (Class 1); TSO-C166b (Class A1S); TSO-C195a (Class C1,C2,C3,C4)
- Mount type: Panel
- Transponder type: Mode A/C, S and ES
- Squawk code selection: Push-button
- Traffic Information Services (TIS) alerts compatible: Yes
- Solid state transmitter (more efficient, longer life): Yes
- Aural alerts: Yes
- Total Air Temperature (TAT): Yes
- Pressure altitude readout: Yes
- Altitude monitor function: Yes
- Density altitude readout: Yes
- Built-in timers: Yes
- Automatic ALT/GND mode: Yes
- Wireless connectivity to portable device using Garmin Pilot, ForeFlight or compatible Garmin portable: Yes
- Subscription-free weather and traffic: Yes
- Internal AHRS (non-certified): Yes
- 1090 MHz ADS-B Out: Yes
- Dual-link 1090MHz and 978MHz UAT ADS-B In: Yes
- Built in GPS/WAAS receiver: Optional
- Displays on G500/G600, GTN 650/750, GNS 430W/530W, and others: Yes
- Pressure altitude encoder module (mounts to connector backplate): Optional
- TAS/TCAS traffic integration with ADS-B In: Yes
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