Those various model Baofengs and similar Chinese radios can be programmed to receive and transmit on any frequency within their range- listen in on various UHF and VHF commercial users like lumber yards, ski areas etc, catch the weather service. broadcast at your own risk. They are legal to use on amateur radio (HAM) Frequencies, including through repeaters, only if you have an amateur radio license. They can easily be programmed to but are not technically legal to use on the FRS and GMRS frequencies because they have removable antennas and exceed the power limits and probably splatter interference over adjacent channels . Honestly, the "range" claims are absurd- UHF and VHF are line of site only and with these small antennas a mile is optimistic. If you don't want to mess around with cryptic instructions and programming and aren't getting a ham license, a regular FRS radio will do the same tricks with less chance of getting stuck in some weird mode regarding tone squelch or something. You can get a pair for $30. The "sub-channels" or privacy codes are just a sub-audible tone squelch. They don't give you any privacy, they just prevent you from hearing others on the same frequency if they aren't using the same tone. The Chinese radios can be programmed to transmit and squelch with these tones too, but it is a bit of a pain to do manually.
My call sign is W7ATB. Any other licensed Hams coming? I'll have 50W ham radio with a rooftop 1/4 wave antenna monitoring 146.52 and the local uhf/vhf repeaters, and doing APRS so should be able to reach the outside world from most places in the event of an emergency.
I will also carry a dedicated pair of cheap/legal FRS radios for talking to spotters and immediate trail convoys.