Tell me about CB radios....

We occasionally hear reports of people who get stranded in isolated areas without cell service (link to one below). In those circumstances, would a portable CB radio be likely to connect with anybody? What's a typical range outdoors? Do the police still monitor channel 9? Also, for many purposes the handheld FRS/GMRS walkie-talkies have become much more common. Do authorities monitor those? Would anybody be likely to hear a call for help on one?
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