74
GTN 725/750 Cockpit Reference Guide
190-01007-04 Rev. K
Messages
Message
Description
Action
DATALINK -
GSR 56 is
inoperative or
connection to GTN
is lost.
The GTN is configured
for a Garmin GSR 56
and the GTN cannot
communicate with the
GSR 56. GSR Weather,
Position Reporting, and
Phone Services will be
unavailable.
Close the GSR 56 circuit breaker
and ensure the GSR 56 is receiving
power. Contact dealer for service.
DATA LOST -
Pilot stored data
was lost. Recheck
settings.
User settings such as
map detail level, NAV
range ring on/off, traffic
overlay on/off, and alert
settings have been lost.
Recheck settings.
DATA SOURCE -
Heading source
inoperative or
connection to GTN
lost.
The GTN is configured
to receive heading
information but is not
receiving it from any
source.
Heading up map displays will not
be available. Contact dealer for
service.
DATA SOURCE -
Pressure altitude
source inoperative
or connection to
GTN lost.
The GTN is configured
to receive pressure
altitude but is not
receiving it from any
source.
If the GTN is being used to forward
pressure altitude to a transponder,
the transponder will not be
receiving pressure altitude from the
GTN while that message is present.
Contact dealer for service.
DATA SOURCE -
Radar Altimeter
source inoperative
or connection to
GTN lost.
The GTN is configured
to receive radio altitude
information but is not
receiving it from any
source.
50 foot aural annunciation
is unavailable for HTAWS
installations. Contact dealer for
service.
DEMO MODE -
Demo mode is
active. Do not use
for navigation.
The GTN is in Demo
Mode and must not
be used for actual
navigation.
Do not use for navigation. Power
cycle the GTN to exit demo mode.
Also ensure that the Direct-To key
is not stuck.
