Watch out for the radio police... they'll get ya..... come on, just use them with common sense... if you start walking on people or someone says you are jamming channels. Be polite and change to a different frequency.
As for the Radio Police, the Amateur Radio Operators are the ones to worry about.
They will track you down and turn you in.
Just find an unused frequency, decide on VHF UHF, program the frequency to same as the other radios. Turn it on key the transmit key, very easy to use. These are inexpensive radios, lots of radio guys dislike their use due to people not understanding what frequencies are unused.
How does one get their license to use these radios?