Watch the Talkgroup ID's, and if you are a Paid Member of Radio Reference, you can download the info directly into your radio so that the actual names show up.
When you see the Talkgroup ID's they will appears as 4 or 5 digit numbers, like 13021 or 9032. Look to the Talkgroup Lists on the RR site for StarCom21 (
* StarCom21 Statewide Illinois P25 Trunking System, Statewide, Illinois - Scanner Frequencies) or the CARMA StarCom21 Profile (
http://www.carmachicago.com/profiles/StarCom21.pdf) and all the TGID's are listed in both locations. When you see and ID come up just compare it to the List.
Eventually you will want to program Text Tags for the TGID's in your area, this way the name (ISP Dist 9A) will show up instead of 13004.
Enjoy!