Affirmative
Yes or confirmation.
Negative
No.
Officer down
An officer is in distress and needs immediate assistance.
10-1
Receiving poorly.
10-2
Receiving well.
10-3
Stop transmitting.
10-4
Message received and understood (acknowledgment).
10-5
Relay message.
10-6
Busy, stand by.
10-7
Out of service.