WAAS position source for ADS-B & ideal for your G3X/G3X Touch System.  GPS 20A does not come with a GPS antenna. You must order the GA 35, part number 11-09701

• Rule-compliant, non-TSO’d GPS position source for experimental aircraft
  
• Adds new capabilities for Garmin G3X and G3X Touch systems
  
• Meets WAAS/SBAS position source requirements for ADS-B “Out”
  
• Compatible with a wide range of 1090 ES transponders
  
• Provides an economical path to ADS-B compliance

Designed to fit within the equipment budget and operating requirements of most experimental/amateur-built and light sport (LSA) aircraft owners, the GPS 20A provides a simple, self-contained WAAS position source that works with most
1090 ES transponders to meet the latest Federal Aviation Adminstration (FAA) rules for ADS-B “Out” compliance.

Using data from the worldwide GPS satellite network, the GPS 20A receiver generates precise information about your aircraft’s position, track and groundspeed. It then provides this information to your ES transponder’s “squitter” signal (via an RS-232 interface), which then broadcasts the data to the ADS-B ground station network for relay to ATC and other ADS-B “In” equipped aircraft in the surrounding airspace. This extended squitter technology allows your aircraft to automatically transmit more accurate and useful traffic surveillance data — including aircraft flight ID, position, altitude, velocity, climb/descent and heading information — to those tracking and controlling aircraft movements in ATC airspace. The extended squitter format can accommodate significantly more data elements than the basic Mode S transponder signal, so ADS-B system users are able to track each airplane’s flight path with much greater precision, accuracy and situational awareness.