There are several forms of digital communications that use information other than the NAC. A NAC is for P25, a color code (CC) is DMR, a RAN is nexedge, there are also motorola Type systems that may or may not be digital. Basically, under the MODE column of the listing if it doesn't say FM or NFM your Baofeng BF-F8 can not receive it. In your city the Fire/EMS and county sheriff (who dispatches your city/county police) are both P25.