Garmin GPS Receiver 400/500 User Manual download pdf (Page 9)

Section 1

TIS Operation and Symbology

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PART ONE:

TRAFFIC INFORMATION SERVICE (TIS) INTERFACE

Section 1: TIS Operation and Symbology

TIS Operation

NOTE: Part One of this Addendum assumes the user has experience operating the 400/500

Series units and the Garmin GTX 330 Transponder.

The Trafﬁc Information Service (TIS) provides a graphic display of trafﬁc advisory information in the

cockpit for non-TCAS equipped aircraft. TIS is a ground-based service providing relative location of all

ATCRBS Mode A and Mode C transponder-equipped aircraft within a speciﬁed service volume. The TIS

ground sensor uses real-time track reports to generate trafﬁc notiﬁcation. TIS Trafﬁc display is available to

aircraft equipped with a Mode S Data Link such as the Garmin GTX 330 Transponder. TIS Trafﬁc from a

GTX 330 Transponder can then be displayed on a Garmin 400/500 Series unit. Surveillance data includes

all transponder-equipped aircraft within the coverage volume. Aircraft without an operating transponder

are invisible to TIS. TIS displays up to eight trafﬁc targets within 7 nautical miles horizontally from 3000

feet below to 3500 feet above the requesting aircraft.

How TCAS differs from TIS—the main

difference between TIS and TCAS is the source

of surveillance data. TCAS uses an airborne

interrogator with a half-second update rate,

while TIS uses the terminal Mode S ground

interrogator and its Data Link to provide about

a ﬁve-second update rate. The range accuracy of

TIS and TCAS is similar.

TIS Coverage Volume (not to scale)

7.0 nm

3,500 ft

3,000 ft

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Garmin GPS Receiver 400/500 User Manual Page 9