Which code corresponds to 'In service, available'?

• A. 10-04
• B. 10-08
• C. 10-02
• D. 10-20

Answer: (B)

Understanding these radio codes helps you convey your status quickly. The code for being on duty and ready to respond is 10-8. It communicates that you are in service and available to take calls or assignments. In practice, you’d use this to let dispatch and other units know you’re free to engage.

For context, other codes in this set refer to different statuses: 10-4 is an acknowledgment or “OK,” indicating you’ve received a message. 10-20 is your location. 10-02 means the signal is good. None of these besides 10-8 specifically pins you as being available to respond.