Garmin GTN 625 Pilot's Manual page 491

Message
DATALINK -
GDL 69 is
inoperative or
connection to GTN
is lost.
DATALINK -
GDL 88 ADS-B
failure. Unable to
transmit ADS-B
messages.
DATALINK -
GDL 88 ADS-B
fault.
DATALINK -
GDL 88 ADS-B
fault. Pressure
altitude input is
invalid.
DATALINK -
GDL 88 ADS-B is
not transmitting
position. Check
GPS devices.
DATALINK -
GDL 88
configuration
module needs
service.
190-01004-03 Rev. K
Description
The GTN is configured
for a Garmin datalink
(GDL 69 or 69A)
and the GTN cannot
communicate with the
datalink. Data from
the datalink will not be
available.
GDL 88 is not able
to transmit an ADS-B
message due to a
failure with the GDL 88
system or antenna(s).
The GDL 88 has
detected a fault with
one of the GDL 88
UAT/1090 antennas.
The GDL 88 has lost
communication with
the pressure altitude
source.
The GDL 88 has
detected a position
input fault.
The GDL 88
has detected a
configuration module
fault.
Garmin GTN 625/635/650 Pilot's Guide
Action
Contact dealer for service.
Contact dealer for service.
Contact dealer for service.
Contact dealer for service.
Contact dealer for service.
Contact dealer for service.
Foreword
Getting
Started
Audio &
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
Index
16-7