I second Bill's suggestion. I have the whole bandplan programmed in, but know they only use 4 frequencies around here. Either way, it's good to have them all. When the rail construction crew went through last month, they were using a channel that isn't normally used around here. Since I had the bandplan programmed in, it was easy to find them on AAR Channel 20.I entered ALL the AAR channels and scanned them, then saved the ones in use in my area or the areas I am passing through.