Altitude Reporting - Garmin GTN 725 Pilot's Manual

2.1.4 Ground
Transponder Operation "Ground" Mode
Figure 2-5 Transponder Mode "Ground" Indication
NOTE: Ground mode is not available with GTX 33/330 software version
8.00 or later. The GTN will automatically transition to Ground mode when
the aircraft is on the ground.
2.1.5 On
Transponder Operation "ON" Mode
2.1.6

Altitude Reporting

1. Touch the Altitude Reporting key for Mode C operation.
2. The transponder will be "On" and will transmit its squawk
2.1.7 VFR
Touch the VFR key to set the VFR squawk code (1200).
VFR (1200) Transponder Squawk Code
190-01007-03 Rev. J
190-01007-03-Final.indb 3
Touch the Ground key to place the transponder into Ground
mode. Mode S replies will be allowed in Ground mode.
Active XPDR and IDENT Enabled
Touch the On key for Mode A operation. The transponder is
"On" and will transmit its squawk code when interrogated.
Figure 2-6 Transponder Mode "ON" Indication
code and altitude when interrogated. An "ALT" annunciation
will appear when the squawk code is transmitted.
Figure 2-7 Transponder VFR Squawk Code
Garmin GTN 725/750 Pilot's Guide
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7/9/2015 2:06:53 PM