Use the "roger" code on a CB radio to reply that you understand the message. "Roger" doesn't mean that you agree or disagree; you would say "affirmative" or "negative" for yes or no.
Step2
Reply with the "roger" code if another operator on the CB radio has given you directions and you understand them. The "roger" code verifies that you've received the message and you understand the directions.
Step3
Use the "roger" code on your CB radio if you are relaying a message to a third party. For example, if another operator wants to send a message but is too far away, he may ask you to pass the message along to a third party. When you've received the message that you will now send to the third party, acknowledge that you've received and understood the message with "roger that" response.
Step4
Reply with the "roger" code instead of "copy" or "10-4" if you feel more comfortable. All three terms mean "message received."