When you are off-roading, usually you are in a group telling your friends what’s up ahead and what to look out for. You are also on a set channel so the people you would be talking to would already know you. Also, in some scenarios you need someone spotting you and a radio is the best way to do this. Another case is if you are winching out of a tough spot and someone is on your winch line, you can communicate with each other safely.