I was wondering how many trunked systems can be monitored at one time with the GRE PRS-500? The scanner will be mainly used as a MARCS radio with the exception of Fairborn PD and HAMCO. If I programmed HAMCO and Fairborn PD into the scanner then how many more towers could I monitor on MARCS. I know that with the other scanners Radio Shack / Uniden you had 10 banks. Hamco equals 1 used, leaving 9 left for MARCS. I'm starting to understand Object Oriented a bit more but I was curious as to how the scanner would work. Some help would be greatly appreciated before I dive into programming it.