Garmin GI 275 Pilot's Manual page 221

Message
Traffic/FIS-B functions
inoperative
UAT fault
UAT traffic/data receiver fault
USB and WiFi Unavailable
VFR GPS is being used
190-02246-01 Rev. A
UAT receiver capable ADS-B LRU reports electrical fault,
calibration data fault, SW CRC Fault, or FPGA CRC Fault
Communication is lost with UAT receiver capable ADS-B LRU
The UAT LRU reports a low battery or fan fault
The ADS-B LRU reports that it is unable to receive UAT traffic
and FIS-B data
While on internal battery operation, the unit conserves energy
by disabling these functions.
VFR GPS is being used
System Messages
Garmin GI 275 Pilot's Guide
Appendix A
Description
199