Signal 13
Officer in need of immediate help.
Affirmative
Yes or understood.
Negative
No or not understood.
All units
Alerting all officers to a situation.
10-1
Receiving poorly (bad signal).
10-2
Receiving well (good signal).
10-4
Acknowledgment (message received and understood).
10-6
Busy, stand by.
10-7
Out of service.
10-8
In service.