Introducing the new echoESX EXP for Experimental aircraft, a remotely mounted transponder system that meets the Transponder and Automatic Depedent Surveillance – Broadcast (ADS-B) requirments for operating in controlled airpsace. The echoESX EXP combines a Mode S transponder and 1090 MHz Extended Squitter ADS-B transmitter with an SBAS Global Positioning System (GPS) position source for compliant ADS-B Out transmissions.