Garmin GTX 330 Pilot's Manual page 9

Mode S Data Transmission
In addition to 4096 code and pressure altitude, the GTX 330 is capable of transmitting
aircraft identification, transponder capability, and maximum speed range. Aircraft
identification is commonly referred to as FLT ID (Flight Identification). The GTX 330 may be
configured by the installer to allow the flight crew to enter FLT ID for each flight. An example
is when air-carrier service requires changing the FLT ID.
The FLT ID may consist of the aircraft registration or a flight number as agreed upon with
the local aviation authority. In either case, the FLT ID must be the same aircraft identification
that appears in the flight plan to correlate the aircraft identification seen on ATC radar with the
correct voice call sign for the aircraft. If no flight plan is filed with the aviation authority (as
may be permitted by regulations), the FLT ID entered is the aircraft registration marking.
When flight crew entry of the FLT ID is not required, the installer configures the system to
report the aircraft identification according to local aviation requirements. In this configuration,
alteration of the FLT ID by the flight crew is not possible.
Flight ID Entry Dialog
When ALLOW PILOT TO EDIT FLT ID is enabled at installation, the flight crew may
change the Flight ID after power up by navigating to the FLIGHT ID Page and pressing the
CRSR key. This opens the Flight ID Entry dialog. After the flight crew enters the correct
Flight ID, the aircraft identification that is transmitted in response to ATC radar interrogations
will properly correlate with the associated call sign for voice communication with the aircraft.
If ALLOW PILOT TO EDIT FLT ID is required but is disabled, contact a Garmin
authorized service center for GTX 330 configuration.
Editing the Flight ID
When the Flight ID Entry dialog is displayed, press the CRSR key to begin editing the
Flight ID. To change a character, press the number keys corresponding to the alphanumeric
character entry. For example, to enter the letter R, press the 5 key four times. Each time an
alphanumeric character is entered, press the CRSR key to move the cursor to the next blank
field. Pressing the CLR key moves the cursor back to the previous character. Once the last
character is entered, press the CRSR key to move the cursor over the remaining blank fields to
complete Flight ID entry.
NOTE: No space is needed when entering Flight ID characters. When a
flight ID contains a space, the GTX 330 automatically removes the spaces
upon completion of Flight ID entry.
Flight ID Entry Dialog
Editing the Flight ID