Pilot's Guide

21190-00587-02 Rev. B
Garmin GTS Traffic Systems
Q AND A
What are the benefits of ADS-B?
1090 MHz Extended Squitter ADS-B data contains additional information
about a target aircraft including flight ID, latitude, longitude, barometric and
geometric altitude, velocity, and direction.
This provides precise location information about the target aircraft. Targets
within the active surveillance range that are correlated with ADS-B data are
displayed with much greater accuracy as a result of this.
When is ADS-B (passive surveillance) available?
Passive surveillance functionality is available for traffic that is equipped with
1090 MHz Extended Squitter (1090ES) ADS-B Out capability. Additionally,
the GTS Traffic System must be installed with the optional GPS and magnetic
heading interfaces.
How is ADS-B data used?
The GTS Traffic System correlates range, altitude, and bearing data from
transponder replies with 1090ES ADS-B Out broadcasts from other aircraft,
using the precision information from ADS-B to improve the quality and accuracy
of the traffic information.
How are active and passive targets displayed?
A traffic target is always displayed as a single symbol, whether or not passive
ADS-B surveillance is available.
Some displays may enhance the depiction of traffic that includes ADS-B
information, including the Flight ID (callsign), heading, velocity, and air/ground
status of the traffic.
Refer to the traffic display documentation to determine the capabilities of
each display.
What capabilities does GPS data provide?
GPS data is required for the ADS-B passive surveillance feature. GPS data
is also used in some installations for air/ground detection, automatic mode
switching, and calculated height above ground.
GPS data is optional and the system can provide active traffic surveillance
with or without GPS data.