The FRS and GMRS are two different radio services that co-exist within the same frequency range of the UHF band. Both services share the same 22 simplex channels and frequencies. These channel and frequency assignments are standard across the industry, so someone with an FRS radio can communicate directly with someone who has a GMRS radio and vice-versa.
So, what's the difference between FRS and GMRS radios?
In this episode of Radio 101, Tommy explains the 5 primary differences between these two radio services and the radios that use them.