400/500 Series Garmin Optional Displays

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.
7.0 nm
TIS Coverage Volume (not to scale)
3,500 ft
3,000 ft
Section 1
TIS Operation and Symbology
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.
1