The AT-770UV is factory locked to GMRS/FRS channels, no repeater offset or PL. Turn off the radio, hold down V/M and turn it on. Set mode to the bands you want, turn off then it's ready to be programmed. It can be programmed (cumbersome method) on the dash itself, but using the software download (version 2.0) from the anytone.net site is the best way to go. As most Chinese-made software, it's not very friendly but usable. I started with the AT-779U and it is compatible with chirp. With 15 (advertised as 18) Watts, it worked really well. speaker wasn't very loud but still for what it is, a very decent little radio. I wanted a louder speaker and mic controls so I upgraded to the UV model. The U did not need to be unlocked but the UV does. It does have many modes to chose from and the GMRS mode is really more FRS, however it does have a commercial mode for ISM and GMRS which is programmable. I opened mine up to use both licenses.