The Mutual Aid channels are not assigned to a region like the Regional Gov't and LE Common channels are. 1-4 are assigned to services (EMS, Fire, Law, etc) and the other 6 are general use. Seems like a list of uses was posted recently.
I assumed the Mut Aid was by Zone-that was an error. I now have corrected my Pal programs. Having 3 digital scanners it seems like I have to reprogram them every week. Getting more like WORK. HaHa