Which term is best described by 10-4?

Which term is best described by 10-4?

• A. Stop transmitting; return to listening.
• B. Acknowledgement; message received and understood.
• C. Out of service; not available for calls.
• D. Location of the officer or incident.

Answer: (B)

The main idea is that radio 10-4 is used to acknowledge and confirm understanding. When someone sends a directive or information, responding with 10-4 tells the sender that the message was received and understood, and that you will act on it. This keeps communications clear and efficient, avoiding the need for a long reply to confirm comprehension. Other phrases describe different radio statuses—ending a transmission, being out of service, or stating a location—so they don’t convey the essential confirmation that the message was received and understood.

The main idea is that radio 10-4 is used to acknowledge and confirm understanding. When someone sends a directive or information, responding with 10-4 tells the sender that the message was received and understood, and that you will act on it. This keeps communications clear and efficient, avoiding the need for a long reply to confirm comprehension. Other phrases describe different radio statuses—ending a transmission, being out of service, or stating a location—so they don’t convey the essential confirmation that the message was received and understood.