Sabe32145, Im not in Arizona, but the easiest way to create favorites list in Sentinal, is to go into the top of the database, click update and get the newest database, then, click on your state, then click on your county. Find the systems/departments you want to listen to, right click on it, and then click Append to Favorites. In the pop up box, click NEW FAVORITES LIST, give it a name. Then do the same for each additional system/department you want to listen to. At this point you can click on the already created favorite, or start a new one. For example, you might want one called Police, one called Fire. Or you might just want a list of everything you like in one list. Either way, when you are finished creating it, upload it to the scanner, and select to erase all favorites on scanner.
Once that is complete, you can go to the menu on the scanner and select systems to scan. Disable the Master List, and turn on your favorite list. Then go to the Services menu, and make sure they are all turned on. From then on, you should be scanning what you selected, and not having to scan all the stuff in the master list, most of which you probably are not interested in, and which slows down the scanner.