As of Friday, 12/8/2023, Lyon County Sheriff's Office is in the midst of switching to ISICS. On this day about half of the deputies were using their old "SO Astro" frequency of 156.210 (P25 digital), and half were using what appears to be the new Lyon Law TG, 41925. I talked with the Sheriff about this several months to a year ago, and at that time he said only law enforcement had plans to switch at that time.
