They are not using their fireground digital talkgroups as they did before since bay county went digital.
Idea is so when things are happening they won’t use up the available radio frequencies on the digital.
There are a handful of MI counties that have already done this. Livingston County, Washtenaw, maybe grand traverse?
All these TAC frequencies are in all the radios that 911 use across the U.S. if the agencies are on 800MHz.
They can be used to talk if for some reason the radio system had problems.
https://wiki.radioreference.com/index.php/Common_Public_Safety#800_MHz
One thing though these frequencies are not on a repeater system meaning you may only pickup their radio a few miles away depending on the weather, where they are at and what type of an antenna you have. A couple weeks ago 8tac93 testing I was getting full signal on the same model you got for $5! 996xt with just the rod antenna, hopefully they incorporate a repeater at some point!