GPS 500 Pilot’s Guide and Reference
12-12
SECTION 12
ADDITIONAL FEATURES
12.2 GTS 8XX TRAFFIC SySTEMS
Introduction
All information in this section pertains to the display and
control of the Garmin GPS 500/GTS 8XX interface, refer to
the 400/500 Series Display Interfaces Pilot’s Guide Addendum
(190-00140-10) when interfacing with non-Garmin products
WARNING:
The GTS 8XX interface is intended
for advisory use only to aid the pilot in visually
acquiring traffic. No avoidance maneuvers
should be based solely upon TAS or TCAS I traffic
information. It is the responsibility of the pilot in
command to see and manuever to avoid traffic.
NOTE: This section assumes the user has
experience operating the GPS 500 and the
GTS 8XX.
NOTE: References to the GTS 8XX throughout
this document refer equally to the GTS 800, GTS
820, and GTS 850 unless otherwise noted.
NOTE: TIS is disabled when a GTS 8XX unit is
installed.
Symbol Traffic Type
Description
Traffic
Advisory (TA)
A TA (Traffic Advisory) is generated when the GTS 8XX predicts that an intruder aircraft may
pose a collision threat. A solid yellow circle represents an intruder aircraft that meets the TA
criteria as described in the TA Alerting Conditions section. A TA consists of the traffic symbol
and an aural alert (e.g., “traffic, 12 o’clock, high, 3 miles”).
Out-of-
Range Traffic
Advisory
This solid yellow half circle appears (on the outer range ring) under the same conditions and
has the same urgency as a TA. Its appearance differs from the TA only to signify that the
intruder is outside of the current range of the Traffic Page.
Proximity
Advisory (PA)
Proximity Advisories (PA) are displayed as solid white (may be configured as cyan) diamonds.
PAs are defined as traffic within the 6.0-nm range, within ±1200 ft. of altitude separation, and
are not a traffic advisory (TA).
Other Traffic
Symbol
The hollow white (may be configured as cyan) diamond represents traffic detected within the
selected display range that does not meet the criteria for a TA or a PA and does not pose an
immediate collision threat.
Table 12-4 TAS/TCAS Symbology
System Description
The GPS 500 provides an optional display interface for
the GTS 8XX Traffic Advisory (TAS) and Traffic Collision
Avoidance (TCAS I) Systems. The GTS 800 and GTS
820 are TAS systems, the GTS 850 is a TSO-Certified
TCAS I system. The GTS 8XX uses active interrogations of
Mode A/C/S (GTS 820 and GTS 850 only) and Mode A/C
transponders to provide Traffic Advisories to the GPS 500.
The GTS 8XX is an active traffic advisory system that
operates as an aircraft-to-aircraft interrogation device. The
GTS 8XX monitors the airspace surrounding an aircraft,
and advises the flight crew where to look for transponder-
equipped aircraft that may pose a collision threat. When
the GTS 8XX receives replies to its interrrogations, it
computes the responding aircraft’s range, bearing, relative
altitude, and closure rate. The GTS 8XX then determines
the advisory status of the target and sends the location
information and alert status to the GPS 500 for display.
The GTS 800 is capable of tracking up to 45 Mode
A/C/S intruders. The GTS 820/850 is capable of tracking
up to 45 Mode A/C plus 30 Mode S intruders. Up to 30
of the most threatening targets are displayed.
190-00181-60 Rev. G
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