ADS–B INS AND OUTS

All airliners must be retrofitted with a transponder to support ADS–B. Small aircraft also need this equipment if they want to fly in certain airspace.

There are two types of ADS-B transponders: ADS–B Out (which transmits the aircraft’s navigation data) and ADS-B In, whereby a pilot can see the location, speed, direction and altitude of other aircraft.

Before ADS–B, 70 percent of the globe was beyond the reach of surveillance, including the

North and South Poles, oceans, mountainous regions and even deserts and jungles.