GTX 345

Overview
Specs
Compatibility
Accessories
Overview 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 source³ 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. For aircraft that may prefer or require a diversity solution, GTX 345 is available in a diversity configuration which utilizes two antennas – mounted on the top and bottom of the aircraft – to provide superior operational coverage. 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 transponder³. 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 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.
³Integrated WAAS GPS position source is not available with diversity option
Engineering enhancements are ongoing and may not be reflected in the pictures, videos and specifications.Specs 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
Compatibility GTX 345 Support for G1000 Aircraft
Display of GTX 345 Traffic Requires SW: GDU v7.10 & GIA 63 v5.31 (and later)
Display of GTX 345 Weather Requires SW: GDU v12.00 & GIA 63 v6.20 (and later)
Aircraft
NON-WAAS G1000 Supported
WAAS G1000 Supported
Traffic
FIS-B Weather
Cessna 350/400
Yes
Yes
Yes
Yes
Cessna 172R/172S
Yes
Yes
Yes
Yes
Cessna 182S/182T/T182T
Yes
Yes
Yes
Yes
Cessna 206H/T206H
Yes
Yes
Yes
Yes
Cessna 208/208B
N/A
Yes
Yes
Yes
Costruzioni Tecnam P2006T
N/A
Yes
Yes
Select Systems
Diamond DA-40/DA-40F
Yes
Yes
Yes
Select Systems
Diamond DA-40NG
Yes
Yes
Yes
No
Diamond DA-40D
N/A
Yes
Yes
Yes
Diamond DA-42
Yes
Yes
Yes
No
Diamond DA-42NG
Yes
Yes
Yes
Select Systems
Diamond DA-42 L360
Yes
Yes
Yes
Select Systems
Hawker Beechcraft 58/58G
Yes
Yes
Yes
No
Hawker Beechcraft A36/G36
Yes
Yes
Yes
No
Mooney M20TN/M20R/M20M
Yes
Yes
Yes
Select Systems
Piper PA-28 Archer
N/A
Yes
Yes
Yes
Piper PA-34 Seneca
N/A
Yes
Yes
Yes
Piper PA-44  Seminole
N/A
Yes
Yes
Yes
Piper PA-46 Matrix/Mirage/Meridian
N/A
Yes
Yes
Select Systems
Socata TBM 700
N/A
Yes
Yes
Yes
Socata TBM 850/900
N/A
Yes
Yes
Select Systems
Vulcanair
P 68, P 68B, P 68C, P 68C-TC
AP68TP300 “Spartacus”
AP68TP 600 “Aviator”
N/A
Yes
Yes
Yes
Other requirements may apply. See a Garmin Authorized Dealer for details.
GTX 345 Display CompatibilityDISPLAY
ADS-B & TIS-B Traffic
FIS-B Products
Remote Transponder Control
TargetTrend
TerminalTraffic
GTN Series
60 targets¹
All
Yes
Yes
Yes
TXi Series
60 targets¹
All
No
No
Yes
G3X Touch
60 targets¹
Regional NEXRAD, CONUS NEXRAD, METARs, TAFs, PIREPs, Winds/Temperatures Aloft, NOTAMs, AIRMETs, SIGMETs, TFRs
Yes
Yes
Yes
G500/G600
60 targets¹
Regional NEXRAD, CONUS NEXRAD, METARs, TAFs, PIREPs, Winds/Temps Aloft, NOTAMs, AIRMETs, SIGMETs, TFRs
No
Yes
Yes
G1000
30 targets (Ver 7.10 and later)
Regional NEXRAD, METARs, TAFs(Ver 12.00 and later⁴)
Yes
No
No
GNS WAAS Series
8 targets²³
Regional NEXRAD, CONUS NEXRAD, METARs, TAFs
No
No
No
Output for GMX 200/MX20
Up to 60 targets¹
Regional NEXRAD, METARs, TAFs
No
No
No
Output for 3rd Party Displays
Up to 60 targets¹ are sent to the 3rd Party display. Refer to 3rd Party documentation for description of traffic display function.
FIS-B data is sent to the 3rd Party display. Refer to 3rd Party documentation for description of FIS-B display function.