Ok, probably stupid question. In South Texas (San Antonio to Austin) there are 3 P25 II systems AARS (Alamo Area Regional Radio System), GATRRS (Greater Austin/Travis Regional Radio System) and LCRA (Lower Colorado River Authority). I programmed my SDS200 using Sentinel with what I want to listen to which comes in fine, however, I pick up channels I never programmed. Example call on (TGID 46004) Comal County Sheriff which I programmed. The a call comes in from ( TGID 14015) Hays County Independant Scool District which I never programmed. Does this have anything to do with control frequencies or is it just the way the systems work.