Garmin 320 Installation Manual page 20

Important Codes:
1200 The VFR Code for any altitude
7600 Loss of Communications
7500 Hijack (Never assigned by ATC without prior notification of the pilot that his or her aircraft is
subject to unlawful interference)
7700 Emergency
7777 Military Interceptor Operations (Never squawk this code.)
0000 Military use (Never squawk this code.)
See the Aeronautical Information Manual (AIM) for a detailed explanation of identification codes.
On occasion, the controller will request "SQUAWK IDENT". Respond by momentarily pressing and releasing
the IDENT button. Pressing the IDENT button activates the Special Position Identification Pulse (SPI) for
approximately 20 seconds identifying your transponder return from other aircraft on the controller's scope.
The reply light will blink each time the transponder replies to ground interrogation. The reply light also remains
lit during the IDENT time interval.
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GTX 320/320A Installation Manual
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