[aprssig] UI question

[Gary]

Can anyone direct me to a website or online document that explains what UI
is as well as what UIDIGI, UICHECK, and UIFLOOD are? I seem to have fallen
further behind that I thought then I ran into these while setting up a
TM-D710 but I'm unclear on what they mean and as usual the radio's manuals
aren't much help.

Thanks,

Gary

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