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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 Trafc Advisory (TAS) and Trafc Collision

Avoidance (TCAS I) Systems. The GTS 800 and GTS

820 are TAS systems, the GTS 850 is a TSO-Certied

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 Trafc Advisories to the GPS 500.

The GTS 8XX is an active trafc 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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