To answer your Q, The PRS service is the closest thing to GMRS, it runs at 476Mhz, is subject to a General User Radio License (GURL) that allows access to 40 channels, usually with a max of 5 watts. handheld-to-handheld typical range is in the couple-of-km's though technically full line of sight range will go out to perhaps 10mi, but that would be pushing it.