Some one was talking about offsets earlier in this forum. All a offset does is use the little bit of frequency that you skip every time when you put freqs in. Ex. (455.000 455.250 455.500 455.750, [using and offset can give you the extra bit of freq on the end of it] *455.300, 455.355, 455.400, 455.550) those are just an example to show what I am talking about I am not to good at describing it as well as I could show or teach it. if any one has questions about radios I has lots of military training being a F.O. I use radios ALOT. (PRC 148, 152, 154) are my bread and butter.