GTX™ 345
All-in-one Transponder Solution for ADS-B “Out” and “In”
- 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 attitude² via Connext® to compatible mobile apps and aera® 660/795/796 portables
- Easy replacement for your existing transponder, with common 1.65-inch tall form factor
Meeting ADS-B equipage rules for NextGen airspace just got easier — and more beneficial — for thousands of aircraft owners worldwide.
With the introduction of the GTX 345 series of Mode S Extended Squitter (ES) transponders, Garmin provides a one-box, one-swap solution that enables owners and operators to meet ADS-B requirements with minimal expense, downtime and disruption to their panels — while providing all the weather and traffic benefits of ADS-B “In.”
Your Transition to NextGen Made Simple
The IFR-certified GTX 345 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.
Your WAAS, Your Way
The extra-precise GPS position reference needed to meet the traffic monitoring requirements of ADS-B can be provided either by the WAAS/SBAS-compliant navigation system that you may already have in your panel — or by an optional built-in GPS position source available with your GTX 345 transponder. However your aircraft is currently equipped, the Garmin GTX 345 series offers a simple, minimally intrusive ADS-B solution to meet your needs. For even more flexibility, optional remote mount GTX versions are available for compatibility with the GTN™ 750/650 series of GPS/Comm/Nav systems, as well as select Garmin G1000® integrated flight deck systems — all of which provide built-in remote transponder code selection and control.
See the Benefits of ADS-B “In”
In addition to 1090 MHz ADS-B “Out”, the 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 and aera 660 series portables, as well as to tablets/mobile devices by way of the Garmin Pilot™, ForeFlight Mobile or FltPlan Go apps. 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 patented 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.
Dual-link Completes the Picture
The 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.
ADS-B for Your Integrated Flight Deck
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 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™).
Alerting and Altitude Encoding Made Simple
For added situational awareness, the 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.
An easier path to NextGen
The Garmin GTX 345 series is FAA and EASA 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.
¹Garmin ADS-B compatibilities cover a wide range of systems and displays; however, not all functions may be available for every configuration. Please check the Compatibility tab for more specifics or limitations that may apply to your system.
²AHRS may be disabled in rotorcraft installations, see your authorized Garmin dealer for more details.
Physical & Performance
- 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
Transponder Features
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