Garmin GDL 88 Weather Radio User Manual


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2-3
190-01122-03 Rev. A
GDL 88 ADS-B Transceiver Pilot’s Guide
2.1 ADS-B - Broadcast (ADS-B)
ADS-B is the automatic broadcast of position reports by aircraft, surface
vehicles, and transmitters on fixed objects. These broadcasts contain much more
datathanjust asimple positionreport,they include:identity (FlightID, Call
Sign,TailNumber,ICAOregistrationnumber,etc),groundtrack,groundspeed,
pressure altitude, indications of multitude capabilities, and emergency status. This
list of data is non-inclusive of other data fields and bits used for various other
functions.
Figure 2-3 ADS-B Operation - FAA Illustration
Garmin display units have the capability to show the status of the ground station
servicesbeingreceived.ExamplesfortheGTNandGNSproductsareshownbelow.
See the display device Pilot Guide for the symbology used on that display.
Unit Symbol Description
GNS
Within coverage of a TIS-B ground station when connected
to a GDL 88.
GNS
Not within coverage of a TIS-B ground station when
connected to a GDL 88.
GNS
GDL 88 does not have a valid track or heading and cannot
place ADS targets on the display.
GTN
Within coverage of a TIS-B ground station when connected
to a GDL 88.
GTN
Not within coverage of a TIS-B ground station when
connected to a GDL 88
Table 2-1 Map TIS-B Availability Symbols
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