Garmin GTN 725 Cockpit Reference Manual page 20

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Transponder Page (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. Mode S
interrogations will be allowed. GND displays in the squawk
code field.
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.
Anonymous: Touch to arm anonymous mode.
Flight ID: This field is active in GDL 88 installations that have
transponders.
NOTE: More detailed descriptions of the transponder panels for
all installations can be found in the GTN 725/750 Pilot's Guide,
P/N 190-01007-03.
10
GTN 725/750 Cockpit Reference Guide
Touch to arm the
Anonymous key.
Touch to enter flight ID.
190-01007-04 Rev. K