Garmin G1000 Series, Pilot'S Manual, Page: 102 / 338

Garmin G1000 Pilot’s Guide for the Diamond DA40
190-00592-00 Rev. A 4-2
TRANSPONDER
MODE S FEATURES
The GTX 33 transponder is equipped with selective
addressing or Mode Select (Mode S), capability. Mode S
functions include the following features:
• Level-2 reply data link capability (used to
exchange information between aircraft and
various ATC facilities)
• Surveillance identifier capability
• Flight ID reporting
• Altitude reporting
• Airborne status determination
• Transponder capability reporting
• Mode S Enhanced Surveillance (EHS)
requirements
• Acquisition squitter
Flight ID Reporting – The G1000 transponder reports
aircraft identification as either the aircraft registration or a
FLT ID (Flight Identification). The system is configured
for either option by an authorized Garmin service center.
If configured for Flight ID entry, the pilot must enter
the appropriate flight ID on the PFD. After the correct
Flight ID is entered, the aircraft identification reported in
response to ATC radar interrogations is properly correlated
with the associated call sign for voice communication.
The flight ID is not to exceed seven (7) characters. No
space is needed when entering Flight ID. When a Flight
ID contains a space, the system automatically removes it
upon completion of Flight ID entry. (See ICAO documents
8168, 4444 and 8585 for further details).
If the Flight ID is set to ‘SAME AS TAIL’ no entry is
required. In this configuration, the transponder then
reports the aircraft registration number to ATC.
Acquisition Squitter – Acquisition squitter, or short
squitter, is the transponder 24-bit identification address.
The transmission is sent periodically, regardless of the
presence of interrogations.
The purpose of acquisition squitter is to enable Mode S
ground stations and Traffic Collision Avoidance System
(TCAS) equipped aircraft to recognize the presence of
Mode S-equipped aircraft for selective interrogation.
TRAFFIC INFORMATION SERVICE (TIS)
Mode S provides a data link for Traffic Information
Service (TIS). TIS is a ground-based service that sends
out location, direction, altitude and climb/descent
information relative to all transponder-equipped aircraft
within a radius of 55 miles from select sites.
For aircraft not equipped with TCAS or TAS, TIS
provides a graphic display of traffic information. TIS
displays up to eight (8) traffic targets within 7.5 nautical
miles from 3,000 feet below to 3,500 feet above your
aircraft. TIS data is updated approximately once every
five (5) seconds.
NOTE: TIS is intended only to assist in
visual acquisition of other aircraft in Visual
Meteorological Conditions (VMC).
NOTE: Aircraft without an operating transponder
are invisible to TIS.