irl cb 15 is used by russian, ukrainian, belarusian, kazachstanian , lithuanian etc. so basicly russian speaking countries. irl channel 19 is used in most countries . from what i know 29 is german irl, the rest i don't know but in ets just stay on 19 since it's default. luckily i know russian so i stay on channel 15 in ets since there isn't any chaos and kids screaming down the mic