some also have some code something that I think allows more private communication.
No extra privacy, it just acts as a filter so you don’t hear other people speaking on that channel unless they’re on the same code. Anyone can still pick up what you’re transmitting.
We have some for snowboard trips, they seemed to work fine as long as you were both on the same side of the mountain. A hill or something in the way between two users will really impact the range – I think about 300m would be as bad as it could get.
Bear in mind too they’re only unlicensed within the EU (definitely not in the US/Canada) and vice versa.