TN72 GPS Receiver

Part No: 01685-00-01

$453.00 $491.00
Shipping calculated at checkout.


ADS-B Out enhances your aircraft’s visibility to others, it has genuine safety benefits for pilot and passengers. Trig transponders are ADS-B Out capable, but they require the addition of a suitable GPS source to exploit this surveillance technology. Pilots with a Trig transponder can simply add a TN72 GPS Position Source to upgrade to ADS-B Out.

Installing a TN72 is a small price to pay for enhanced visibility and peace of mind by reducing the risk of collision. The TN72 GPS is light weight, compact and easy to install. It is highly affordable and uses certified technology – ensuring you are visible to all ADS-B In traffic devices. Don’t compromise your safety by using an uncertified GPS, this can make you invisible to traffic products designed to ‘reject’ uncertified positional data.

In Europe, the TN72 can be installed as a ‘voluntary’ ADS-B Out installation, in both EASA certified aircraft and all other uncertified types. EASA’s CS-STAN provides a specific and simple installation pathway. If you don’t have a Trig transponder, then the TT21/TN72 Conspicuity Bundle provides you with an ideal one box Mode S and ADS-B Out solution.

In the U.S. the TN72 can be used by experimental, light-sport and homebuilt aircraft (and gliders) to meet the FAA’s 2020 ADS-B rule (FAR91.227).

In New Zealand the TN72 can be used as part of a compliant ADS-B system. Guidance from the NZ CAA should be followed, see NZ CAA Notice of Requirement NTC91.258 and AC91-24 for further information or contact the NZ CAA directly.


Taking minimal space in the cockpit, the TA50, compact GPS antenna is the most popular antenna for the TN72. It is supplied with a simple push fit QMA connector, this plugs straight into the TN72 unit. The antenna is available with either a 1m or 3m cable. A wiring harness to connect a compact TT21 or TT22 transponder and the TN72 together is also available and simplifies installation.

The TA70 certified GPS antenna can also be used with the TN72. High wing Part 23 aircraft may alternatively prefer the TA70 antenna. This is mounted on the aircraft upper surfaces and assures enhanced GPS visibility. In countries where ADS-B airspace is mandated, operation in ADS-B airspace by certified types, usually requires full compliance with TSO-C145 GPS technology, see our TN70.


Trig are leaders in ADS-B technology (Automatic Dependant Surveillance Broadcast) and the first company in the world to meet FAA TSO-C166b, the latest standard for ADS-B transponders. Every Trig transponder is Mode S, but also ADS-B Out capable. Once installed ADS-B equipment transmits your aircraft’s precise location directly to other ADS-B equipped aircraft – improving your electronic visibility and safety. To learn more about ADS-B got to our Knowledge Bank article


When fitting a TN72, it uses one of two available configuration options, in the transponder settings (see below). The TN72 hardware is the same in either installation, you may require a software update and you will need to install a TA50 or TA70 GPS antenna.

TN72 GPS – TABS C199 (Traffic Awareness Beacon System) this configuration uses SIL 1/ SDA 1 in the transponder settings. TABS is the FAA technical standard that enables voluntary equipage of ADS-B Out. The TN72 using TABS is ideal for ‘voluntary’ equipage in Europe or where ADS-B Out is not mandated.

TN72 GPS –(X) SIL 3 configuration, this uses SIL 3/ SDA 2 in the transponder settings (typically in the U.S.) and fully satisfies the technical requirements of FAR 91.227 for 2020 compliance. Light-sport, experimental and homebuilt pilots who have fitted a TN72 are now flying inside ADS-B airspace and have passed FAA compliance checks with flying colours.


Trig’s compact transponder is in two parts with a compact control head; this includes an inbuilt altitude encoder – saving further space and expense. A separate hardware box can be installed anywhere in the airframe. The mounted control head is only 54mm (2 3/25”) deep and can be fitted in panel using a 57mm (2 ¼”) round hole or smaller compact mount – the unit ships with the necessary fittings for both install options. Our compact transponders are highly efficient, whilst used in a wide range of GA types they are ideally suited for use in gliders and balloons, via an auxiliary battery.

Trig’s compact transponders are easy to operate and have a crisp, bright display that’s easy to read in all lighting conditions and is equipped with manual dimming. The transponder control head is splash proof too, so it’s ideal for open cockpit and seaplane operations.


Trig’s TT21 has a 130 watts nominal power output, making it a class 2 transponder that meets international standards for 1090ES ADS-B Out (TSO C166b). The TT21 is ideal for use in flight where a light weight Mode S solution is required and is suitable for both IFR and VFR use.


ADS-B enhances safety and visibility – your investment in a TT22 transponder is future proof. Trig has a matching certified GPS position source that is highly affordable called the TN72. This is ideal for ADS-B voluntary equipage and the TN72 can even be used to meet the 2020 mandate by light-sport, experimental and homebuilt types in the U.S.

Our TN70 GPS position source is suitable for certified Part 23 aircraft that need a TSO-C145 position source, for operations in 2020 rule ADS-B airspace using a TT22 transponder.

Customers in the U.S. should be aware that FAA, Federal Aviation Regulations (FAR) 91.227 requires that a compliant ADS-B Out solution uses a Class 1 transponder. The TT22 is a Class 1 device and meets this requirement. The TT21 is a Class 2 device and does not meet this regulation.

Glider customers in the U.S. looking to get ADS-B equipped may wish to see our ADS-B gliding guidance document this highlights equipment and regulations, for both certified and experimental gliders. In the U.S. certified gliders and Part 23 aircraft, operating outside of U.S. 2020 rule ADS-B airspace can be use the TN72 to enhance visibility and trigger ADS-B In traffic.



  • Compact form factor – takes minimal panel space, fits in a compact or standard 57mm instrument hole.
  • Minimal depth – create space on your panel for other avionics.
  • Integrated altitude encoder
  • Certified for IFR / VFR flight
  • Manual dimming feature (adjustable backlight)
  • Low power consumption
  • EASA ETSO and FAA TSO Certification – includes TSO-C166b the latest ADS-B standard
  • Free European Minor Change approvals
  • Free FAA ADS-B STC for 576 aircraft types
  • Unbeatable value and quality – designed and manufactured in the U.K.


Specification TN72 GPS Receiver
Certification TSO-C199 Class B
Compliance TSO-C199 Class B, DO-160G
Supply voltage (DC) 11 – 33 V
Typical consumption (at 14v) at 14V – 0.1A
Operating temperature -40°C to + 70°C
Cooling requirement no fan required
Weight 110 grams / 3.8 ounces
Connector GPS (power, ground and GPS data) – 9 way D type
Antenna – 5V phantom power – QMA male
Dimensions (mm) H 30 x L 90 x W 63mm (W with base flange 80mm)
Dimensions (inches) H 1.2” x L 3.6” x W 2.5” (W with base flange 3.2”)

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