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Garmin GTX-33

Remote Mount IFR-certified Digital Mode S Transponder

Informational Purposes Only
Garmin - Discontinued - 010-00267-11

2-year Manufacturer Limited Warranty



See the same radar traffic your ATC controller is watching – with the GTX 33 remote-mounted Mode S digital transponder. This IFR-certified unit features traffic datalink capability and also meets the European mandate for Mode S level 2 surveillance. The GTX 33 is an all solid-state design, which makes for lower power consumption and reduced heat emissions. The transmitter delivers up to 250 watts of nominal power output. And other highlights include remote ident and auto standby, a Traffic Information Services (TIS) interface, plus altitude monitor with voice alerts.

Leading the way with ADS-B

With available ES, or Extended Squitter, versions of the GTX 33, Garmin has taken the lead in providing an affordable pathway to ADS-B compliance for the FAA’s proposed Next Generation airspace system. Using precise GPS-referenced positioning information, the extended squitter technology enables transponders to automatically transmit more accurate, and more useful, traffic surveillance data – including aircraft flight ID, position, altitude, velocity, climb/descent, and heading information. (Compared to traditional Mode S and Mode C transponders, which can only broadcast altitude, and thus require ground-based radar to correlate and identify the aircraft’s position.)

Enhanced traffic surveillance

Certified to TSO-C166a standards for 1090 MHz extended squitter transmission, Garmin’s GTX 33 ES improves upon the existing transponder query system – while working seamlessly with existing ATC protocols. The ADS-B reports provide ground controllers with considerably faster updates than traditional radar. And by simultaneously broadcasting this information to TAS or TCAS equipped pilots, it enables them to essentially see the same traffic picture for their location that ATC is watching on the ground. Thus, with everyone in the ADS-B loop watching and reacting to the same flight trajectories, safe separation is far easier to maintain.

Squawk the code of quality

All the features of Garmin’s standard GTX 33 transponder are retained in the ES version. Plus, there’s also an antenna diversity option, available with GTX 33D versions, which provides for improved air-to-air surveillance of TCAS-equipped aircraft flying above you. The traffic data enabled by the remote GTX 33 system can be displayed graphically on Garmin’s integrated GPS/Comm/Nav systems that provide built-in transponder code selection.

GTX 33: A whole new standard in transponder utility.

  • Remote mounted, 4096 ident codes Mode A capability
  • Mode S capability: 25 foot resolution with suitable serial data from -1000 to 62,700 feet
  • TSO Compliance C112, certified to 55,000 feet

Physical & Performance:

Unit dimensions, WxHxD: 6.92"W x 1.78"H x 11.05"D (17.6 x 4.5 x 28.1 cm)
Weight: 4.31 lb (1.95 kg)
Display type: digital
Voltage range: 11-33
Transmit power: 250 watts nominal
Transponder type: mode A/C and S
Squawk code selection: remote entry through CNX 80, GNS 480 or G1000

Features & Benefits:

Solid state transmitter (more efficient, longer life): yes
Verbal alerts: yes
Traffic Information Services (TIS) alerts compatible: yes
Outside air temperature display: no
Pressure altitude readout: no
Altitude monitor function: no
Density altitude readout: no
Built-in timers: no
Automatic ALT/GND mode: yes
Diversity (supports top and bottom mounted antennae to enhance visibility to TCAS-equipped aircraft flying above you): no
Panel-mounted: no

  • GTX 33 transponder
  • Installation kit
  • Pilot's guide

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GTX-33 Product Commentary

Sarasota Avionics The GTX33 is the remote mounted version of the GTX330. The GTX33 is designed to work with Garmin navigators such as the GTN750, GTN650, G900X, G1000, and GNS480/CNX80. The GTX33 is a mode A/C/S solid state transponder with the ability to send TIS traffic information to--and be controlled by--a compatible Garmin display, giving customers another set of eyes to look for other aircraft nearby. The GTX33 is also available in the “ES” version that stands for extended squitter. When ADSB “out” is required for operation about 18,000 ft, pilot’s with the GTX33ES will meet ADSB “out” requirements and can fly in Class A airspace.

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