In my vehicle's center console I keep a hand-held CB radio. This gets used for day-to-day stuff (such as figuring out the cause of the traffic up ahead on the highway). Otherwise, CB isn't that great of communication method. It's a very wide AM signal with a maximum of 4 watts for a typical CB. This means, in order to get the best performance, you need a very large antenna, and even then you pick up a lot of garbage interference. Other than with truckers, it's basically a dying communication method.

In my kit, I keep an FRS/GMRS radio. This is a much better communication method, as you can easily get 5-watt GMRS radios that operate with a lot less interference. IIRC, you're allowed up to 50 watts of transmitting power on GMRS. (Remember though, that a license is required for GMRS.) It's also a much more common communication method, specifically with people on foot.

With that in mind, FRS/GMRS works fine for general communication among small groups and it's good to have because of commonality, but it's still really not ideal. If you really need the ability to communicate, a HAM radio is the way to go. A basic Technician Class license is easy enough to get and allows for a wide array of communication options. Much more-so than CB or GMRS.