Garmin GTN 725 Cockpit Reference Manual page 19

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Transponder Panel Page (Non-GDL 88 Installations with Mode C Transponder)
Standby: Touch to place transponder in Standby mode. It is still
powered, but will not transmit information. STBY displays in
the squawk code field.
Ground: Touch to place transponder in Ground mode. Refer to the
documentation provided with your GTX transponder for specific
information on this mode of operation.
On: Touch to turn transponder On for Mode A operation. Will
transmit the squawk code when interrogated. ON displays in
the squawk code field.
Altitude
Touch for Mode C operation. The transponder will be on and
will transmit its squawk code and altitude when interrogated.
Reporting:
ALT displays in the squawk code field.
VFR: Touch to set the squawk code to 1200.
Enable ES: Touch to toggle extended squitter.
Flight ID: This field is inactive in non-GDL 88 installations.
190-01007-04 Rev. K GTN 725/750 Cockpit Reference Guide
Transponder Mode Keys
Green indicates current
condition.
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