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16-8
Garmin GTN 625/635/650 Pilot’s Guide
190-01004-03 Rev. B
Foreword
Getting
Started
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Music
Utilities
System
Messages
Symbols
Appendix
Index
Message Description Action
GAD 42 -
GAD 42 needs
service.
GAD 42 indicates it
needs service. The GAD
42 may continue to
function.
Verify all input/output data from/
to the GAD 42 Interface Adapter.
Contact dealer for service.
GLIDESLOPE -
Glideslope receiver
needs service.
The glideslope board is
indicating that it needs
service. The glideslope
board may continue to
function.
Verify glideslope deviation
indications with another source
and crosscheck final approach
fix crossing altitude. If another
glideslope source is not available
for verification, fly a GPS based
approach. Contact dealer for
service.
GLIDESLOPE -
Glideslope receiver
has failed.
The glideslope board
is not communicating
property with the
system.
Fly an approach that does not use
the glideslope receiver (VOR, LOC,
GPS). Contact dealer for service.
GPS
NAVIGATION
LOST -
Insufficient
satellites. Use other
navigation source.
GPS position has been
lost due to lack of
satellites.
Use a different GPS receiver
or a non-GPS based source of
navigation. Contact dealer for
service.
GPS
NAVIGATION
LOST -
Erroneous
position. Use other
navigation source.
GPS position has been
lost due to erroneous
position.
Use a different GPS receiver
or a non-GPS based source of
navigation. Contact dealer for
service.
GPS RECEIVER -
GPS receiver has
failed. Check GPS
coax for electrical
short.
Internal communication
to the SBAS board is
inoperative.
Use a different GPS receiver
or a non-GPS based source of
navigation. Contact dealer for
service.