Altitude Reporting - Garmin GTN 725 Cockpit Reference Manual

Standby: Touch to place transponder in Standby mode. It is still
powered, but will not transmit information. STBY displays in
the squawk code fi eld.
Ground: Touch to place transponder in Ground mode. Mode S
interrogations will be allowed. GND displays in the squawk
code fi eld.
On: Touch to turn transponder On for Mode A operation. Will
transmit the squawk code when interrogated. ON displays in
the squawk code fi eld.
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 fi eld.
VFR: Touch to set the squawk code to 1200.
8
Transponder Panel Page
GTN 725/750 Cockpit Reference Guide (CRG)
Transponder
Mode - Green
indicates
current
condition
190-01007-04 Rev. B