I would suggest buying the NXDN upgrade for the SDS100. At least you will be able to hear Madison SO. They are alot more enjoyable to listen to than Madison PD, unless you're into listening to running tags all day. I think it was only $30 when I upgraded. It took a while to figure out the sentinel program, but it isn't that bad once you figure it out. The best thing to do is create new favorites lists and manually add your system into the favorites list. You need to assign the system you create a quick key. Once you power on the scanner, just enter the key (0-9, .) and press enter and it should begin to scan the sites you program. I would only program in the Lake Cavalier site and play from there to start off with.