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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.

Carl Wolf, Garmin VP of Aviation Marketing
Garmin GTX 345
Garmin GTX 345 iPad with weather and traffic

See the Benefits of ADS-B In

In addition to 1090 MHz ADS-B “Out”, the Garmin GTX 345 also makes available the subscription-free weather and traffic display capabilities enabled by ADS-B “In” — which can be interfaced with compatible cockpit displays or streamed wirelessly via Garmin Connext to our aera 796/795 series portables, as well as to popular tablets/mobile devices by way of apps such as Garmin Pilot™, or ForeFlight Mobile. The ADS-B weather link is continuously broadcast on the 978 MHz Universal Access Transceiver (UAT) frequency, and is similar to the basic services offered by leading commercial satellite weather providers. For example, you can access NEXRAD imagery, METARs, TAFs, winds and temperatures aloft, PIREPs, NOTAMs, and more1: Along with this, you can also receive ADS-B traffic position reports (and threat-level symbology) to help you see-and-avoid converging targets in busy airspace. Spoken audio alerts call out potential flight path conflicts (“Traffic, 10 O’Clock, same altitude, two miles”) to get you looking in the right direction. Meanwhile, on your display, Garmin’s patent-pending TargetTrend™ relative motion display1 offers a faster, more intuitive way of judging target trajectories and closure rates in relation to your flight path. As an added safety feature, available on most new Garmin products, our TerminalTraffic™ technology provides a comprehensive picture of ADS-B equipped aircraft and ground vehicles in the airport environment. ADS-B equipped aircraft in flight are easily distinguished from ground vehicles and taxiing aircraft, which are displayed using distinct colors and symbols. All of this information is presented on a simple, easy-to-understand SafeTaxi® diagram which references the location of runways, taxiways, hangar locations and more.

The Garmin GTX 345 ADS-B receiver is a dual-link system. So, it can receive on both frequencies (978 MHz and 1090 MHz) authorized for ADS-B operations in the U.S. Not only does this provide the most complete traffic picture from aircraft transmitting on either frequency, but it also enhances your aircraft’s ability to access ADS-B transmissions and services from virtually anywhere. When integrating an active traffic system with the GTX 345, ADS-B traffic and active traffic targets are merged on the display to give pilots a truly comprehensive traffic picture.

With a variety of compatibilities covering most fielded displays, our ADS-B enabled GTX series transponders offer the easiest NextGen upgrade path available from Garmin — especially for owners of select G1000-equipped aircraft. For these systems, a remote mount version, the Garmin GTX 345R, interfaces with either the aircraft’s existing WAAS position source for navigation or uses an optional built-in WAAS position source to meet ADS-B “Out” requirements. The G1000 series displays interface with the remote GTX transponder to provide onscreen squawk code entry and control in the conventional manner. Depending on the software version installed, your Garmin glass displays can also support subscription-free weather on the MFD — as well as ADS-B traffic targets on both the MFD and PFD displays for aircraft equipped with Synthetic Vision Technology (SVT™).

For added situational awareness, the Garmin GTX 345 incorporates a built-in audio output for audible traffic and altitude alerts¹, which can be integrated into your existing audio panel. You can also pair the GTX series with an optional Garmin altitude encoder to satisfy data transmission requirements for IFR. As opposed to other transponders with altitude encoding built in, the Garmin altitude encoder mounts separately on the install rack. So, should the transponder ever require removal, there’s no need for the static line to be disconnected. Which, in turn, eliminates the need for a follow-on leak check — and thus helps minimize ongoing service costs.

The Garmin GTX 345 series is being FAA approved for installation on hundreds of today’s most popular aircraft makes and models. For decades, Garmin has led in the development and deployment of ADS-B technology. And when you compare all the options available, it’s clear that Garmin is committed to making your transition to ADS-B operations as simple, economical and worry-free as possible.

  • 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
Contact Banyan Avionics
Danny Santiago
Danny SantiagoDirector of Avionics
For Connectivity Information
954.492.3555
Eric Smith
Eric SmithAvionics Sales & Support
954.492.3555

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