Garmin 695 Manuale Utente

190-00919-00 Rev. G

153

The GDL 39 is a receive-only data link radio with on-board GPS, 978 MHz (Universal 

Access Transceiver frequency band), and 1090 MHz Extended Squitter (1090 ES) 
receivers.  It is designed to receive, process, and output traffic (ADS-B air-to-air, and 
TIS-B traffic information), and weather (Flight Information Service-Broadcast (FIS-B)) 
information to the GPSMAP 695/696 through a power/data cable. 

ADS-B (Automatic Dependent Surveillance-Broadcast) is a surveillance technology 

deployed across the United States as the cornerstone of the FAA’s Next Generation Air 
Transportation System (NextGen). ADS-B enables improved surveillance services, both 
air-to-air and air-to-ground, especially in areas where radar is ineffective due to terrain 
or where it is impractical or cost prohibitive. Initial applications of air-to-air ADS-B are 
for “advisory” use only, enhancing a pilot’s visual acquisition of other nearby ADS-B 
equipped aircraft either when airborne or on the airport surface. 

For the purpose of distinguishing between levels of ADS-B service, there are three 

classifications of aircraft or system capability; ADS-B In, ADS-B Out, and ADS-B 
participating.  ADS-B In refers to the capability to receive ADS-B information.  ADS-B 
Out refers to the capability to transmit ADS-B information.  ADS-B participating refers