On Nov 24, 5:38*pm, "BT" wrote:
You do not mention the make and model of the transponder and I did not see
it in the video. The newer garmin (and others) transponders (if tied to a
GPS) will automatically switch from STBY to ALT when a set ground speed is
reached and return to STBY when it is slowed below that ground speed. It is
possible to turn off ModeC and just squawk the code. It is very unusual for
the altitude to miss report.


My guess is that its a new C-172 with the G1000 with the transponder
just built in. There is a button along the bottom of the PFD that
brings up transponder options. The transponder is no longer a separate
unit.

-Robert