I have the GRT SafeFly2020 and echoUAT combo with a GRT EFIS and my PAPR has lots of errors

If you get SIL, SDA and NIC errors on your PAPR it is likely that the GRT is not set up properly. Make sure these values are entered in the GRT under General settings/TT22/echoUAT:   GRT EFIS TT22/EchoUAT Settings: DU-SF Communication (Status) Verify “Yes” SF-echoUAT Communication Verify “OK” Remote Status Verify “OK” External GPS Communication [...]