Garmin GTN 725 Pilot's Manual page 514

Message
Foreword
TRANSPONDER
Getting
1 OR 2
Started
Transponder 1 or
Audio &
2 is inoperative or
Xpdr Ctrl
connection to GTN
Com/Nav
is lost.
TRANSPONDER
FPL
1 OR 2
ADS-B is not
Direct-To
transmitting
position.
Proc
TRUE NORTH
Charts
APPROACH -
Verify NAV Angles
Wpt Info
are referenced to
True North (T).
Map
VERTICAL
Traffic
CALCULATOR -
Approaching target
Terrain
altitude. Start
descent.
Weather
Nearest
VERTICAL
Services/
CALCULATOR -
Music
Approaching target
Utilities
altitude.
System
VLOC RECEIVER -
Navigation receiver
Messages
needs service.
Symbols
Appendix
17-22
Index
Description
The GTN is configured
for transponder 1 or
2 but is not able to
communicate with the
transponder.
The transponder has
insufficient data to
support ADS-B.
A procedure is loaded
that is referenced
to true north and
the active leg has a
published true north
reference.
User has configured
a vertical descent
calculation, and the
aircraft is within
60 seconds of the
calculated top of
descent.
User has configured
a vertical descent
calculation, and the
aircraft is approaching
the target altitude.
The nav radio is
reporting that it needs
service. The nav radio
may continue to
function.
Garmin GTN 725/750 Pilot's Guide
Action
Verify squawk code and altitude
with ATC. Contact dealer for
service.
Ensure the aircraft has a clear
view of the sky. Contact dealer for
service.
Verify the Nav Angle is set to True
North.
No action is necessary; message is
informational only.
No action is necessary; message is
informational only.
Use GPS based navigation.
Contact dealer for service.
190-01007-03 Rev. D