Garmin G3X Touch Pilot's Manual page 261

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Thus, the ADS-B receiver receives traffic information directly from any ADS-B Out
aircraft within range as well as the rebroadcast of ADS-B information from any nearby
GBT. This rebroadcast is called Automatic Dependent Surveillance-Rebroadcast
(ADS-R) and is automatically triggered by the detection of an ADS-B participating
aircraft within the service volume of the GBT. As a 978 MHz (UAT frequency) receiver,
the ADS-B receiver can receive both the Traffic Information Service-Broadcast (TIS-B)
and Flight Information Service-Broadcast (FIS-B) provided in conjunction with ADS-R
services when in range of a GBT.
FIS-B service is provided continuously, but ADS-R including TIS-B will only be
broadcast by a GBT when an ADS-B participating aircraft is within the GBT's defined
service volume. In this case, a GBT will only rebroadcast TIS-B information relative
to the ADS-B participating aircraft. Only traffic that is within 15 nm lateral
and 3,500' vertical of the ADS-B participating aircraft is provided in the
broadcast. Non-participating traffic aircraft located farther than 15 nm laterally and
3,500' vertically from the participating aircraft is are excluded from the information
transmitted by the GBT.
TIS-B traffic information includes non-participating aircraft detected by ATC
surveillance radar. As TIS-B data is derived from ATC surveillance radar data, TIS-B
traffic position updates typically occur every three to thirteen seconds. Therefore,
TIS-B traffic may be displayed with degraded positional accuracy. Aircraft
without operating transponders are invisible to TIS-B. Aircraft operating
outside of the ATC radar coverage area are also not displayed.
Since the ADS-B receiver is a receive-only device, even when used onboard an aircraft
equipped with a qualifying GPS and 1090 ES transponder, a GBT may not identify it as
an ADS-B participating aircraft. The squitter of some 1090 ES transponders must be
configured to communicate the aircraft has 978 MHz receive capability in order to be
identified as an ADS-B participating aircraft.
WARNING: Do not rely solely upon the display of traffic information for col-
lision avoidance maneuvering. The traffic display does not provide collision
avoidance resolution advisories and does not, under any circumstances or
conditions, relieve the pilot's responsibility to see and avoid other aircraft.
190-02472-00 Rev. D
Garmin G3X Touch
Pilot's Guide for Certified Aircraft
Hazard Avoidance
239

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