Garmin GTN 725 Cockpit Reference Manual page 80

Message
TRANSPONDER 2-
Transponder 2
is inoperative or
connection to GTN is
lost.
TRANSPONDER 1-
ADS-B is not
transmitting position.
TRANSPONDER 2-
ADS-B is not
transmitting position.
TRUE NORTH
APPROACH-
Verify NAV Angles
are referenced to True
North (°T).
VERTICAL
CALCULATOR-
Approaching target
altitude. Start descent.
VERTICAL
CALCULATOR-
Approaching target
altitude.
VLOC RECEIVER-
Navigation receiver
needs service.
VLOC RECEIVER-
Navigation receiver has
failed.
72
Description
The GTN is confi gured for
transponder 1 or 2 but is
not able to communicate
with the transponder.
The transponder has
insuffi cient data to
support ADS-B.
The transponder has
insuffi cient 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 confi gured
a vertical descent
calculation, and the
aircraft is within 60
seconds of the calculated
top of descent.
User has confi gured
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.
The NAV radio is not
communicating property
with the system.
GTN 725/750 Cockpit Reference Guide (CRG)
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.
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.
Use GPS based navigation.
Contact dealer for service.
190-01007-04 Rev. C