Garmin GTX 3X5 Series Pilot's Manual - Page 14
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replies to identification and altitude interrogations as indicated by the Reply
symbol (
).
The GTX 3X5 transmits ADS-B Out data. Replies to altitude interrogations and
ADS-B Out data include the aircraft' s standard pressure altitude.
2.3 Squawk Code Keys
There are eight squawk code entry keys (0 – 7) that provide access to all
ATCRBS codes. Pushing one of these keys begins the code selection
sequence. Digits that are not yet entered appear as underscored blanks.
The new code is activated when the fourth digit is entered. Pressing the
CLR key moves the cursor back to the previous digit. Holding the CLR
key moves the cursor back to the first digit. Pressing the CLR key when
the cursor is on the first digit of the code, or pressing the CRSR key
during code entry, removes the cursor and cancels code entry.
2.4 Function Keys
IDENT The IDENT key activates the special position identification (SPI) pulse for
18 seconds, which distinguishes your transponder from others on the air traffic
controller' s screen. The word "IDENT" will appear in the upper left corner of the
display during this time.
VFR VFR sets the transponder code to the preprogrammed VFR code, which is
selected during installation configuration (this is set to 1200 at the factory). Pressing
the VFR key again restores the previous identification code.
FUNC Cycles through top level function groups shown on the right side of the
display. Menu groups include:
• Transponder (XPDR)
• Timers (TMR)
• Altitude (ALT)
• System (SYS)
ENT Acknowledges selection of menu items and pilot data entry
fields.
2-2
Figure 2-1 Squawk Code Entry Field
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Garmin GTX 3X5 Pilot's Guide
190-01499-00 Rev. 1