Garmin MX20 - Manual (Page 132)

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Appendix
Problem Possible Cause Action
XPDR flag TIS-A Sensor Installation Ensure that the TIS-A unit is
installed and functional.
ADSB flag GDL 90 is reporting that its internal
GPS is not reporting a position or
is reporting an invalid position.
Note that ADS-B broadcasts do not
include position reports when this
flag is present. Ensure the GDL 90 is installed and
functional. Ensure the GDL 90 GPS
antenna has a clear view of the sky
to receive GPS signals.
IDENT (green) flag This is not a problem. This flag
appears when the GDL 90 is in the
Ident mode. None required.
See the Installation Manual for additional troubleshooting procedures.
Troubleshooting